def test_matrix_expression_from_index_summation():
from sympy.abc import a, b, c, d
A = MatrixSymbol("A", k, k)
B = MatrixSymbol("B", k, k)
C = MatrixSymbol("C", k, k)
expr = Sum(W[a, b] * X[b, c] * Z[c, d], (b, 0, l - 1), (c, 0, m - 1))
assert MatrixExpr.from_index_summation(expr, a) == W * X * Z
expr = Sum(W.T[b, a] * X[b, c] * Z[c, d], (b, 0, l - 1), (c, 0, m - 1))
assert MatrixExpr.from_index_summation(expr, a) == W * X * Z
expr = Sum(A[b, a] * B[b, c] * C[c, d], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T * B * C
expr = Sum(A[b, a] * B[c, b] * C[c, d], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T * B.T * C
expr = Sum(C[c, d] * A[b, a] * B[c, b], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T * B.T * C
expr = Sum(A[a, b] + B[a, b], (a, 0, k - 1), (b, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == A + B
expr = Sum((A[a, b] + B[a, b]) * C[b, c], (b, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == (A + B) * C
expr = Sum((A[a, b] + B[b, a]) * C[b, c], (b, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == (A + B.T) * C
expr = Sum(A[a, b] * A[b, c] * A[c, d], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == MatMul(A, A, A)
expr = Sum(A[a, b] * A[b, c] * B[c, d], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == MatMul(A, A, B)
# Parse the trace of a matrix:
expr = Sum(A[a, a], (a, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, None) == trace(A)
expr = Sum(A[a, a] * B[b, c] * C[c, d], (a, 0, k - 1), (c, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, b) == trace(A) * B * C
# Check wrong sum ranges (should raise an exception):
## Case 1: 0 to m instead of 0 to m-1
expr = Sum(W[a, b] * X[b, c] * Z[c, d], (b, 0, l - 1), (c, 0, m))
raises(ValueError, lambda: MatrixExpr.from_index_summation(expr, a))
## Case 2: 1 to m-1 instead of 0 to m-1
expr = Sum(W[a, b] * X[b, c] * Z[c, d], (b, 0, l - 1), (c, 1, m - 1))
raises(ValueError, lambda: MatrixExpr.from_index_summation(expr, a))
# Parse nested sums:
expr = Sum(A[a, b] * Sum(B[b, c] * C[c, d], (c, 0, k - 1)), (b, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == A * B * C
# Test Kronecker delta:
expr = Sum(A[a, b] * KroneckerDelta(b, c) * B[c, d], (b, 0, k - 1),
(c, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == A * B
def test_matrix_expression_from_index_summation():
from sympy.abc import a,b,c,d
A = MatrixSymbol("A", k, k)
B = MatrixSymbol("B", k, k)
C = MatrixSymbol("C", k, k)
expr = Sum(W[a,b]*X[b,c]*Z[c,d], (b, 0, l-1), (c, 0, m-1))
assert MatrixExpr.from_index_summation(expr, a) == W*X*Z
expr = Sum(W.T[b,a]*X[b,c]*Z[c,d], (b, 0, l-1), (c, 0, m-1))
assert MatrixExpr.from_index_summation(expr, a) == W*X*Z
expr = Sum(A[b, a]*B[b, c]*C[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T*B*C
expr = Sum(A[b, a]*B[c, b]*C[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T*B.T*C
expr = Sum(C[c, d]*A[b, a]*B[c, b], (b, 0, k-1), (c, 0, k-1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T*B.T*C
expr = Sum(A[a, b] + B[a, b], (a, 0, k-1), (b, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == A + B
expr = Sum((A[a, b] + B[a, b])*C[b, c], (b, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == (A+B)*C
expr = Sum((A[a, b] + B[b, a])*C[b, c], (b, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == (A+B.T)*C
expr = Sum(A[a, b]*A[b, c]*A[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == MatMul(A, A, A)
expr = Sum(A[a, b]*A[b, c]*B[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == MatMul(A, A, B)
# Parse the trace of a matrix:
expr = Sum(A[a, a], (a, 0, k-1))
assert MatrixExpr.from_index_summation(expr, None) == trace(A)
expr = Sum(A[a, a]*B[b, c]*C[c, d], (a, 0, k-1), (c, 0, k-1))
assert MatrixExpr.from_index_summation(expr, b) == trace(A)*B*C
# Check wrong sum ranges (should raise an exception):
## Case 1: 0 to m instead of 0 to m-1
expr = Sum(W[a,b]*X[b,c]*Z[c,d], (b, 0, l-1), (c, 0, m))
raises(ValueError, lambda: MatrixExpr.from_index_summation(expr, a))
## Case 2: 1 to m-1 instead of 0 to m-1
expr = Sum(W[a,b]*X[b,c]*Z[c,d], (b, 0, l-1), (c, 1, m-1))
raises(ValueError, lambda: MatrixExpr.from_index_summation(expr, a))
# Parse nested sums:
expr = Sum(A[a, b]*Sum(B[b, c]*C[c, d], (c, 0, k-1)), (b, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == A*B*C
# Test Kronecker delta:
expr = Sum(A[a, b]*KroneckerDelta(b, c)*B[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == A*B
def _calculate_structure_constants(self):
"""Calculates the structure constants"""
# For improved performance use explicit Symengine backend
gens = [_CMatrix(x) for x in self.generators()]
n = len(gens)
f = MutableDenseNDimArray.zeros(n, n, n) * sympify("0")
d = MutableDenseNDimArray.zeros(n, n, n) * sympify("0")
for i in range(n):
for j in range(n):
for k in range(n):
f[i, j, k] = -2 * I * \
trace(commutator(gens[i], gens[j]) * gens[k])
d[i, j, k] = 2 * \
trace(commutator(
gens[i], gens[j], anti=True) * gens[k])
return (f, d)
def get_pauli_coefficient(matrix, coefficient):
"""Extract given Pauli coefficient from matrix.
The coefficient must be specified in the form of a tuple whose i-th
element tells the Pauli operator acting on the i-th qubit.
For example, `coefficient = (2, 1)` asks for the Y1 X2 coefficient.
Generally speaking, it should be a valid input to `pauli_product`.
The function works with sympy objects.
"""
num_qubits = len(coefficient)
return sympy.trace(matrix * pauli_product(*coefficient)) / 2**num_qubits
def param_analysis(N, subplot, alpha=_alpha, k1=_k1, k_1=_k_1, k2=_k2, k_2=_k_2, k3=_k3):
xstep = np.linspace(0, 1, N)
x, y, k2 = sp.symbols('x y k2')
#матрица Якоби
f1 = k1 * (1 - x - y) - k_1 * x - k3 * (1 - x)**alpha * x * y
f2 = k2 * (1 - x - y) ** 2 - k_2 * y**2 - k3 * (1 - x)**alpha * x * y
# след и определитель Якобиана
A = sp.Matrix([f1, f2])
jacA = A.jacobian([x, y])
det_jacA = jacA.det()
trace = sp.trace(jacA)
Y = sp.solve(f1, y)[0]
print(Y)
# Y = (k1 - k1 * x - k_1 * x) / (k1 + k3 * (1 - x)**2 * x)
# K2 = (k_2 * Y**2 + k3 * (1-x)**alpha*x*Y) / (1-x-Y)**2
K2 = sp.solve(f2, k2)[0]
K2 = K2.subs(y, Y)
ystep=[]
k2step=[]
realxstep = []
dots = []
for i in xstep:
tmpy = Y.subs(x, i)
if(tmpy >= 0 and tmpy <= 1 and tmpy + i >= 0 and tmpy + i <= 1):
if K2.subs(x, i) != sp.zoo:
k2step.append(K2.subs(x, i))
ystep.append(tmpy)
realxstep.append(i)
if i > 0:
det = det_jacA.subs(y, Y)
prev = det.subs([(x, realxstep[len(realxstep) - 2]), (y, ystep[len(realxstep) - 2]), (k2, k2step[len(realxstep) - 2])])
curr = det.subs([(x, realxstep[len(realxstep) - 1]), (y, ystep[len(realxstep) - 1]), (k2, k2step[len(realxstep) - 1])])
if prev * curr < 0:
dots.extend(dot_correct(det, len(realxstep) - 2, realxstep, ystep, k2step, K2, Y))
if i > 0:
det = det_jacA.subs(y, Y)
prev = trace.subs([(x, realxstep[len(realxstep) - 2]), (y, ystep[len(realxstep) - 2]), (k2, k2step[len(realxstep) - 2])])
curr = trace.subs([(x, realxstep[len(realxstep) - 1]), (y, ystep[len(realxstep) - 1]), (k2, k2step[len(realxstep) - 1])])
if prev * curr < 0:
dots.extend(dot_correct(trace, len(realxstep) - 2, realxstep, ystep, k2step, K2, Y))
else:
break
# dots = dot_correct(det, dots, realxstep, ystep, k2step, K2)
print(dots)
# param_plot(realxstep, ystep, k2step, subplot, dots)
param_plot(realxstep, k2step, subplot, 'r', 0, 0, "$x_{k_2}$")
param_plot(ystep, k2step, subplot, 'g', 0, 0, "$y_{k_2}$")
dot_plot(subplot, dots)
def find_scalar_curvature(self):
"""
Method performs scalar contraction on the Ricci tensor.
"""
try:
Ricci = self.Ricci
except AttributeError:
print "Ricci tensor must be determined first."
return None
g = self.g
g_inv = self.g.inv()
scalar_curv = sympy.simplify(g_inv*Ricci)
scalar_curv = sympy.trace(scalar_curv)
self.scalar_curv = scalar_curv
return self.scalar_curv
def find_scalar_curvature(self):
"""
Method performs scalar contraction on the Ricci tensor.
"""
try:
Ricci = self.Ricci
except AttributeError:
print "Ricci tensor must be determined first."
return None
g = self.g
g_inv = self.g.inv()
scalar_curv = sympy.simplify(g_inv * Ricci)
scalar_curv = sympy.trace(scalar_curv)
self.scalar_curv = scalar_curv
return self.scalar_curv
def _trace_single_line(t):
"""
Evaluate the trace of a single gamma matrix line inside a ``TensExpr``.
Notes
=====
If there are ``DiracSpinorIndex.auto_left`` and ``DiracSpinorIndex.auto_right``
indices trace over them; otherwise traces are not implied (explain)
Examples
========
>>> from sympy.physics.hep.gamma_matrices import GammaMatrix as G, \
LorentzIndex, _trace_single_line
>>> from sympy.tensor.tensor import tensor_indices, tensorhead
>>> p = tensorhead('p', [LorentzIndex], [[1]])
>>> i0,i1,i2,i3,i4,i5 = tensor_indices('i0:6', LorentzIndex)
>>> _trace_single_line(G(i0)*G(i1))
4*metric(i0, i1)
>>> _trace_single_line(G(i0)*p(-i0)*G(i1)*p(-i1)) - 4*p(i0)*p(-i0)
0
"""
def _trace_single_line1(t):
t = t.sorted_components()
components = t.components
ncomps = len(components)
g = LorentzIndex.metric
# gamma matirices are in a[i:j]
hit = 0
for i in range(ncomps):
if components[i] == GammaMatrix:
hit = 1
break
for j in range(i + hit, ncomps):
if components[j] != GammaMatrix:
break
else:
j = ncomps
numG = j - i
if numG == 0:
tcoeff = t.coeff
return t.nocoeff if tcoeff else t
if numG % 2 == 1:
return TensMul.from_data(S.Zero, [], [], [])
elif numG > 4:
# find the open matrix indices and connect them:
a = t.split()
ind1 = a[i].get_indices()[0]
ind2 = a[i + 1].get_indices()[0]
aa = a[:i] + a[i + 2:]
t1 = tensor_mul(*aa)*g(ind1, ind2)
t1 = t1.contract_metric(g)
args = [t1]
sign = 1
for k in range(i + 2, j):
sign = -sign
ind2 = a[k].get_indices()[0]
aa = a[:i] + a[i + 1:k] + a[k + 1:]
t2 = sign*tensor_mul(*aa)*g(ind1, ind2)
t2 = t2.contract_metric(g)
t2 = simplify_gpgp(t2, False)
args.append(t2)
t3 = TensAdd(*args)
t3 = _trace_single_line(t3)
return t3
else:
a = t.split()
t1 = _gamma_trace1(*a[i:j])
a2 = a[:i] + a[j:]
t2 = tensor_mul(*a2)
t3 = t1*t2
if not t3:
return t3
t3 = t3.contract_metric(g)
return t3
t = t.expand()
if isinstance(t, TensAdd):
a = [_trace_single_line1(x)*x.coeff for x in t.args]
return TensAdd(*a)
elif isinstance(t, (Tensor, TensMul)):
r = t.coeff*_trace_single_line1(t)
return r
else:
return trace(t)
return out
# formulate the PDE
x = sp.symbols("x0:2")
n = sp.symbols("n0:2")
u = (sp.Function("u0")(*x), sp.Function("u1")(*x))
# L = sp.Function('lambda')(*x)
# M = sp.Function('mu')(*x)
L = sp.symbols("lambda")
M = sp.symbols("mu")
dim = 2
F = [[u[i].diff(x[j]) for i in range(dim)] for j in range(dim)]
F = sp.Matrix(F)
strain = sp.Rational(1, 2) * (F + F.T)
stress = L * sp.eye(dim) * sp.trace(strain) + 2 * M * strain
PDEs = [sum(stress[i, j].diff(x[j]) for j in range(dim)) for i in range(dim)]
FreeBCs = [sum(stress[i, j] * n[j] for j in range(dim)) for i in range(dim)]
FixBCs = [u[i] for i in range(dim)]
# norms is an array which is later defined
sym2num = {
L: 1.0,
M: 1.0,
sp.Integer(1): 1.0,
sp.Integer(2): 2.0,
L.diff(x[0]): 0.0,
L.diff(x[1]): 0.0,
M.diff(x[0]): 0.0,
M.diff(x[1]): 0.0,
n[0]: lambda i: norms[i, 0],
def duoparam_analysis(N, subplot, alpha=_alpha, k1=_k1, k_1=_k_1, k2=_k2, k_2=_k_2, k3=_k3):
xstep = np.linspace(0, 1, N)
x, y, k2, k1 = sp.symbols('x y k2 k1')
f1 = k1 * (1 - x - y) - k_1 * x - k3 * (1 - x)**alpha * x * y
f2 = k2 * (1 - x - y) ** 2 - k_2 * y**2 - k3 * (1 - x)**alpha * x * y
eq1 = sp.lambdify((x, y, k1), f1)
eq2 = sp.lambdify((x, y, k2), f2)
Y, X = np.mgrid[0:.5:1000j, 0:1:2000j]
U = eq1(X, Y, 0.012)
V = eq2(X, Y, 0.012)
print("HERE")
velocity = np.sqrt(U * U + V * V)
plt.streamplot(X, Y, U, V, density=[2.5, 0.8], color=velocity)
plt.xlabel('x')
plt.ylabel('y')
# plt.xlim([0.1, 0.5])
# plt.ylim([0.1, 0.5])
# plt.title('Phase portrait')
plt.show()
#след и определитель Якобиана
A = sp.Matrix([f1, f2])
jacA = A.jacobian([x, y])
det_jacA = jacA.det()
trace = sp.trace(jacA)
Y = sp.solve(f1, y)[0]
Det = sp.solve(det_jacA.subs(y, Y), k2)[0]
Trace = sp.solve(trace.subs(y, Y), k2)[0]
K2 = sp.solve(f2.subs(y, Y), k2)[0]
res = Det - K2
tr = sp.solve(Trace - K2, k1)[0]
print("3.5: ", res)
print("tr", tr)
# print("3.5: ", sp.expand(Det - K2))
# K1 = sp.solve((Det - K2), k1)[0]
# print("4 ", K1)
k1step_det = []
k2step_det = []
k1step_tr = []
k2step_tr = []
dots = []
for i in xstep:
sol1 = sp.solve(res.subs(x, i), k1)
# print("sol", sol1)
if len(sol1) > 0:
tmpk1_det = sol1[0]
tmpk2_det = Det.subs([(k1, tmpk1_det), (x, i)])
# print("tmpk1", tmpk1_det)
# print("tmpk2", tmpk2_det)
k1step_det.append(sp.re(tmpk1_det))
k2step_det.append(sp.re(tmpk2_det))
tmpk1_tr = tr.subs(x, i)
tmpk2_tr = Trace.subs([(k1, tmpk1_tr), (x, i)])
k1step_tr.append(sp.re(tmpk1_tr))
k2step_tr.append(sp.re(tmpk2_tr))
print(i)
print("k1det", k1step_det)
print("k1tr", k1step_tr)
param_plot(k1step_det, k2step_det, subplot1, 'g', [0, 1], 0)
param_plot(k1step_tr, k2step_tr, subplot1, 'b', [0, 1], 0)
def test_matrix_expression_from_index_summation():
from sympy.abc import a,b,c,d
A = MatrixSymbol("A", k, k)
B = MatrixSymbol("B", k, k)
C = MatrixSymbol("C", k, k)
w1 = MatrixSymbol("w1", k, 1)
i0, i1, i2, i3, i4 = symbols("i0:5", cls=Dummy)
expr = Sum(W[a,b]*X[b,c]*Z[c,d], (b, 0, l-1), (c, 0, m-1))
assert MatrixExpr.from_index_summation(expr, a) == W*X*Z
expr = Sum(W.T[b,a]*X[b,c]*Z[c,d], (b, 0, l-1), (c, 0, m-1))
assert MatrixExpr.from_index_summation(expr, a) == W*X*Z
expr = Sum(A[b, a]*B[b, c]*C[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T*B*C
expr = Sum(A[b, a]*B[c, b]*C[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T*B.T*C
expr = Sum(C[c, d]*A[b, a]*B[c, b], (b, 0, k-1), (c, 0, k-1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T*B.T*C
expr = Sum(A[a, b] + B[a, b], (a, 0, k-1), (b, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == A + B
expr = Sum((A[a, b] + B[a, b])*C[b, c], (b, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == (A+B)*C
expr = Sum((A[a, b] + B[b, a])*C[b, c], (b, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == (A+B.T)*C
expr = Sum(A[a, b]*A[b, c]*A[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == MatMul(A, A, A)
expr = Sum(A[a, b]*A[b, c]*B[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == MatMul(A, A, B)
# Parse the trace of a matrix:
expr = Sum(A[a, a], (a, 0, k-1))
assert MatrixExpr.from_index_summation(expr, None) == trace(A)
expr = Sum(A[a, a]*B[b, c]*C[c, d], (a, 0, k-1), (c, 0, k-1))
assert MatrixExpr.from_index_summation(expr, b) == trace(A)*B*C
# Check wrong sum ranges (should raise an exception):
## Case 1: 0 to m instead of 0 to m-1
expr = Sum(W[a,b]*X[b,c]*Z[c,d], (b, 0, l-1), (c, 0, m))
raises(ValueError, lambda: MatrixExpr.from_index_summation(expr, a))
## Case 2: 1 to m-1 instead of 0 to m-1
expr = Sum(W[a,b]*X[b,c]*Z[c,d], (b, 0, l-1), (c, 1, m-1))
raises(ValueError, lambda: MatrixExpr.from_index_summation(expr, a))
# Parse nested sums:
expr = Sum(A[a, b]*Sum(B[b, c]*C[c, d], (c, 0, k-1)), (b, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == A*B*C
# Test Kronecker delta:
expr = Sum(A[a, b]*KroneckerDelta(b, c)*B[c, d], (b, 0, k-1), (c, 0, k-1))
assert MatrixExpr.from_index_summation(expr, a) == A*B
expr = Sum(KroneckerDelta(i1, m)*KroneckerDelta(i2, n)*A[i, i1]*A[j, i2], (i1, 0, k-1), (i2, 0, k-1))
assert MatrixExpr.from_index_summation(expr, m) == A.T*A[j, n]
# Test numbered indices:
expr = Sum(A[i1, i2]*w1[i2, 0], (i2, 0, k-1))
assert MatrixExpr.from_index_summation(expr, i1) == A*w1
expr = Sum(A[i1, i2]*B[i2, 0], (i2, 0, k-1))
assert MatrixExpr.from_index_summation(expr, i1) == MatrixElement(A*B, i1, 0)
def GRAPE_pulse(H, duration, N, gamma=0.01, thres=1e-8, init_state=None, autostop=False):
""" Main function to optimize pulse with GRAPE.
** H, qu.qobj: Hamiltonian operator as a qutip qobj
** duration, float: Time length of the pulse
** N, int: Number of time slices to split Ex and Ey into
** gamma, float: Learning parameter, at each step, simulator jumps by gamma * del f
** thres, float: Tolerance threshold for final converged run.
** autostop, bool: If True, terminate the run after 10000 iterations
== OUT ==
"""
################################################
# Setup
################################################
print('Setting up run.')
# Construct basis vectors and collapse operators for Hilbert space
b_vec = []
e_ops = []
# In the future, allow for the implementation of spin ensembles with different
# spins
for ii in range(int(2*H.s+1)):
basis_state = ob.basis(int(2*H.s+1),ii)#qu.basis(int(2*H.s+1), ii)
for jj in range(H.N):
if jj == 0:
basis_vec = basis_state
collapse_op = TensorProduct(basis_state, basis_state)#np.outer(basis_state, basis_state)#basis_state * basis_state.dag()
else:
basis_vec = TensorProduct(basis_vec, basis_state)#np.kron(basis_vec, basis_state)#qu.tensor(basis_vec, basis_state)
collapse_op = TensorProduct(collapse_op, basis_state.T * basis_state)#np.kron(collapse_op, np.outer(basis_state, basis_state))#qu.tensor(collapse_op, basis_state * basis_state.dag())
b_vec.append(basis_vec)
e_ops.append(collapse_op)
X_control = np.array(sym.symbols('x0:{0}'.format(N), real=True))
Y_control = np.array(sym.symbols('y0:{0}'.format(N), real=True))
U = H.unitary(X_control, Y_control, duration)
# Create U lambda for convenience
U_lambda = sym.lambdify(np.append(X_control, Y_control), np.array(U))
################################################
# Build desired unitary
################################################
print('Building desired unitary.')
# Construct the desired unitary. For now, pick the one that swaps all of them down
for ii in range(H.N):
if ii == 0:
Uideal = 2 * ob.spin_operator(0.5,'x')#qu.sigmax()
else:
Uideal = TensorProduct(Uideal, 2 * ob.spin_operator(0.5,'x'))#np.kron(Uideal, 2 * ob.spin_operator(0.5,'x'))#qu.tensor(Uideal, qu.sigmax())
# Construct the ideal bra vectors
bras_ideal = [sym.conjugate((Uideal * b_vec[ii]).T) for ii in range(len(b_vec))] #[b_vec[ii].dag() * Uideal.dag() for ii in range(len(b_vec))]
################################################
# Calculate fidelity function
################################################
print('Calculating fidelity.')
if init_state == None:
F = 0
for ii in range(len(b_vec)):
# Calculate <n|Uideal * Ugrape|n>
term = (bras_ideal[ii] * U * b_vec[ii])[0,0]
print(ii+1)
F += term
# Get fidelity, convert to fast lambda function
F = sym.conjugate(F) * F / len(b_vec)**2
else:
if init_state.pure:
desired_state = Uideal * init_state.vector
actual_state = U * init_state.vector
F = (sym.conjugate(desired_state.T) * actual_state)[0,0]
F = (sym.conjugate(F) * F)
else:
raise ValueError('Error: Mixed state currently does not work. Aborting.')
desired_state = Uideal * init_state.rho * sym.conjugate(Uideal.T)
actual_state = U * init_state.rho * sym.conjugate(U.T)
P, D = desired_state.diagonalize()
sqrt_desired = P * D ** (1/2) * P ** -1
full = sqrt_desired * actual_state * sqrt_desired
pdb.set_trace()
P, D = full.diagonalize(); print('6')
F = sym.trace( D ** (1/2) ) ** 2; print('7')
F_func = sym.lambdify(np.append(X_control, Y_control), F)
# Calculate the analytical gradient in both quadratures
delF_x = []
delF_y = []
print('Calculate analytical gradient')
for ii in range(N):
diff_x = sym.lambdify(np.append(X_control, Y_control),
sym.diff(F, X_control[ii]))
diff_y = sym.lambdify(np.append(X_control, Y_control),
sym.diff(F, Y_control[ii]))
delF_x.append(diff_x)
delF_y.append(diff_y)
print(ii+1)
print('Done.')
################################################
# Initialize guess and simulation arrays
################################################
print('Initialize guess.')
# Dumb initial guess, uniform driving with no normalization whatsoever
current_EpsX = 2 * np.pi * np.ones(N) / duration
current_EpsY = np.zeros(N)
# Look at initial Uideal to see if it's reasonable
# Unfortunately, to evaluate, we need to iterate through all the values we want and cast
# them as default Python floats (instead of numpy.float64)
args = []
for ii in range(len(current_EpsX)):
args.append(float(current_EpsX[ii]))
for ii in range(len(current_EpsY)):
args.append(float(current_EpsY[ii]))
#Uinit = sym.Matrix(U_lambda(*current_EpsX.astype(float), *current_EpsY.astype(float)))
Uinit = sym.Matrix(U_lambda(*args))
N_iter = 1
F_list = [0] # Initialize list of fidelities
EpsX_list = []
EpsY_list = []
################################################
# The fun bit
################################################
print('Starting run.')
init_trial = True # If this is the first run, delete the first element of F_list
while ((1 - F_list[-1]) > thres):
if init_trial: # Hokey bodge to make the while loop run the first time
F_list = []
init_trial = False
start = time.time()
# Numerically evaluate the fidelity and gradient at the trial point
control_args = list(np.append(current_EpsX, current_EpsY))
for ii in range(len(control_args)):
control_args[ii] = complex(control_args[ii])
# Calculate trial fidelity. Take real fidelity
F_trial = np.real(F_func(*control_args))#F.xreplace(param_dict)
# Append everything to arrays
F_list.append(float(F_trial))
EpsX_list.append(np.copy(current_EpsX))
EpsY_list.append(np.copy(current_EpsY))
#F_trial = sym.N(F_trial)
print('F: {0}'.format(F_trial))
delF_x_trial = np.array([])
delF_y_trial = np.array([])
for ii in range(len(delF_x)):
delF_x_trial = np.append(delF_x_trial, delF_x[ii](*control_args))
delF_y_trial = np.append(delF_y_trial, delF_y[ii](*control_args))
# Make a step, keeping only the real part of the gradient (there is a numerical artifact)
current_EpsX += gamma * np.real(delF_x_trial)
current_EpsY += gamma * np.real(delF_y_trial)
if (N_iter == 10000) & autostop:
break
N_iter += 1
# Convert everything to arrays
EpsX_list = np.array(EpsX_list)
EpsY_list = np.array(EpsY_list)
F_list = np.array(F_list)
return EpsX_list, EpsY_list, F_list
lam = E*nu/((1+nu)*(1-2*nu))
G = E/(2*(1+nu))
# In[6]:
B1, B2, B3, Babs = symbols('B1:4 |B|')
g0,g1,g2,g3,g4 = symbols('g0:5')
(exx,exy,exz,eyx,eyy,eyz,ezx,ezy,ezz) = symbols('e1:4(1:4)')
B = Matrix([B1,B2,B3])
epst = Matrix([[exx,exy,exz],[eyx,eyy,eyz],[ezx,ezy,ezz]])
# In[7]:
epstd = epst-trace(epst)/3*eye(3)
# In[8]:
I1 = trace(epst)
I2 = 0.5*trace(epst*epst)
I4 = sum(B.T*B)
I5 = sum(B.T*epstd*B)
I6 = sum(B.T*epstd*epstd*B)
#I5 = 0
#I6 = 0
# In[9]:
return out
# formulate the PDE
x = sp.symbols('x0:2')
n = sp.symbols('n0:2')
u = (sp.Function('u0')(*x), sp.Function('u1')(*x))
#L = sp.Function('lambda')(*x)
#M = sp.Function('mu')(*x)
L = sp.symbols('lambda')
M = sp.symbols('mu')
dim = 2
F = [[u[i].diff(x[j]) for i in range(dim)] for j in range(dim)]
F = sp.Matrix(F)
strain = sp.Rational(1, 2) * (F + F.T)
stress = L * sp.eye(dim) * sp.trace(strain) + 2 * M * strain
PDEs = [sum(stress[i, j].diff(x[j]) for j in range(dim)) for i in range(dim)]
FreeBCs = [sum(stress[i, j] * n[j] for j in range(dim)) for i in range(dim)]
FixBCs = [u[i] for i in range(dim)]
# norms is an array which is later defined
sym2num = {
L: 1.0,
M: 1.0,
sp.Integer(1): 1.0,
sp.Integer(2): 2.0,
L.diff(x[0]): 0.0,
L.diff(x[1]): 0.0,
M.diff(x[0]): 0.0,
M.diff(x[1]): 0.0,
n[0]: lambda i: norms[i, 0],
def init_r(self):
""" Ricci scalar of the metric. """
if isinstance(self.ricci, type(None)):
self.init_ricci() # Initialize Ricci tensor (if not already done)
self.r = sp.trace(sp.simplify(sp.Matrix(self.ricci)*self.inv))
def two_parameter_analysis(f1, f2, param_dict, cond_mult, cond_y, const1,
const2):
param1 = k_1
param2 = k1
jac_A = Matrix([f1, f2]).jacobian(Matrix([x, y]))
det_A = jac_A.det()
trace_A = trace(jac_A)
y_of_x = solve(f2, y)[0]
param2_of_x = solve(f1, param2)[0]
param2_trace = solve(trace_A, param2)[0]
param1_trace = solve(param2_trace - param2_of_x, param1)[0]
param2_det = solve(det_A, param2)[0]
param1_det = solve(param2_det - param2_of_x, param1)[0]
x_grid = np.linspace(0, 1, 1000)
y_of_x_func = lambdify([x, k3, k_3], y_of_x, 'numpy')
y_grid = y_of_x_func(x_grid, param_dict[k3], param_dict[k_3])
new_x_grid = []
new_y_grid = []
for curr_x, curr_y in zip(x_grid, y_grid):
if 0 <= curr_x + cond_mult * curr_y <= 1 and 0 <= curr_y <= cond_y:
new_x_grid.append(curr_x)
new_y_grid.append(curr_y)
x_grid = np.array(new_x_grid)
y_grid = np.array(new_y_grid)
param1_trace_subs = np.zeros(x_grid.shape)
param2_trace_subs = np.zeros(x_grid.shape)
param1_det_subs = np.zeros(x_grid.shape)
param2_det_subs = np.zeros(x_grid.shape)
for i in range(x_grid.shape[0]):
param1_trace_subs[i] = param1_trace.subs({
x: x_grid[i],
y: y_grid[i],
k2: param_dict[k2],
k3: param_dict[k3],
k_3: param_dict[k_3]
})
param2_trace_subs[i] = param2_of_x.subs({
x: x_grid[i],
y: y_grid[i],
k_1: param1_trace_subs[i],
k2: param_dict[k2],
k3: param_dict[k3],
k_3: param_dict[k_3]
})
param1_det_subs[i] = param1_det.subs({
x: x_grid[i],
y: y_grid[i],
k2: param_dict[k2],
k3: param_dict[k3],
k_3: param_dict[k_3]
})
param2_det_subs[i] = param2_of_x.subs({
x: x_grid[i],
y: y_grid[i],
k_1: param1_det_subs[i],
k2: param_dict[k2],
k3: param_dict[k3],
k_3: param_dict[k_3]
})
e1, e2 = jac_A.eigenvals()
for curr_x, curr_y, curr_param2, curr_param1 in zip(
x_grid, y_grid, param2_trace_subs, param1_trace_subs):
curr_e1 = e1.subs({
x: curr_x,
y: curr_y,
k1: curr_param2,
k_1: curr_param1,
k2: param_dict[k2],
k3: param_dict[k3],
k_3: param_dict[k_3]
})
curr_e2 = e2.subs({
x: curr_x,
y: curr_y,
k1: curr_param2,
k_1: curr_param1,
k2: param_dict[k2],
k3: param_dict[k3],
k_3: param_dict[k_3]
})
if curr_e1.is_real and curr_e2.is_real and curr_e1 < const1 and curr_e2 < const1:
plt.plot(curr_param2, curr_param1, 'X', color='g')
param1_det_diff = param1_det.diff(x)
param1_det_diff_func = lambdify([x, y, k2, k3, k_3], param1_det_diff,
'numpy')
diff_arr = []
for i in range(x_grid.shape[0]):
if fabs(
param1_det_diff_func(x_grid[i], y_grid[i], param_dict[k2],
param_dict[k3],
param_dict[k_3])) < const2:
diff_arr.append(x_grid[i])
c_x = sum(diff_arr) / len(diff_arr)
c_y = y_of_x_func(c_x, param_dict[k3], param_dict[k_3])
c_param1 = param1_det.subs({
x: c_x,
y: c_y,
k2: param_dict[k2],
#k1: param_dict[k1],
k3: param_dict[k3],
k_3: param_dict[k_3]
})
c_param2 = param2_of_x.subs({
x: c_x,
y: c_y,
k_1: c_param1,
k2: param_dict[k2],
#k1: param_dict[k1],
k3: param_dict[k3],
k_3: param_dict[k_3]
})
plt.plot(param2_trace_subs, param1_trace_subs, '--', label='neutrality')
plt.plot(param2_det_subs, param1_det_subs, label='multiplicity')
plt.plot(c_param2, c_param1, 'ro', color='r')
plt.xlabel('k1')
plt.ylabel('k_1')
plt.show()
def recurse_expr(expr, index_ranges={}):
if expr.is_Mul:
nonmatargs = []
pos_arg = []
pos_ind = []
dlinks = {}
link_ind = []
counter = 0
args_ind = []
for arg in expr.args:
retvals = recurse_expr(arg, index_ranges)
assert isinstance(retvals, list)
if isinstance(retvals, list):
for i in retvals:
args_ind.append(i)
else:
args_ind.append(retvals)
for arg_symbol, arg_indices in args_ind:
if arg_indices is None:
nonmatargs.append(arg_symbol)
continue
if isinstance(arg_symbol, MatrixElement):
arg_symbol = arg_symbol.args[0]
pos_arg.append(arg_symbol)
pos_ind.append(arg_indices)
link_ind.append([None]*len(arg_indices))
for i, ind in enumerate(arg_indices):
if ind in dlinks:
other_i = dlinks[ind]
link_ind[counter][i] = other_i
link_ind[other_i[0]][other_i[1]] = (counter, i)
dlinks[ind] = (counter, i)
counter += 1
counter2 = 0
lines = {}
while counter2 < len(link_ind):
for i, e in enumerate(link_ind):
if None in e:
line_start_index = (i, e.index(None))
break
cur_ind_pos = line_start_index
cur_line = []
index1 = pos_ind[cur_ind_pos[0]][cur_ind_pos[1]]
while True:
d, r = cur_ind_pos
if pos_arg[d] != 1:
if r % 2 == 1:
cur_line.append(transpose(pos_arg[d]))
else:
cur_line.append(pos_arg[d])
next_ind_pos = link_ind[d][1-r]
counter2 += 1
# Mark as visited, there will be no `None` anymore:
link_ind[d] = (-1, -1)
if next_ind_pos is None:
index2 = pos_ind[d][1-r]
lines[(index1, index2)] = cur_line
break
cur_ind_pos = next_ind_pos
ret_indices = list(j for i in lines for j in i)
lines = {k: MatMul.fromiter(v) if len(v) != 1 else v[0] for k, v in lines.items()}
return [(Mul.fromiter(nonmatargs), None)] + [
(MatrixElement(a, i, j), (i, j)) for (i, j), a in lines.items()
]
elif expr.is_Add:
res = [recurse_expr(i) for i in expr.args]
d = collections.defaultdict(list)
for res_addend in res:
scalar = 1
for elem, indices in res_addend:
if indices is None:
scalar = elem
continue
indices = tuple(sorted(indices, key=default_sort_key))
d[indices].append(scalar*remove_matelement(elem, *indices))
scalar = 1
return [(MatrixElement(Add.fromiter(v), *k), k) for k, v in d.items()]
elif isinstance(expr, KroneckerDelta):
i1, i2 = expr.args
if dimensions is not None:
identity = Identity(dimensions[0])
else:
identity = S.One
return [(MatrixElement(identity, i1, i2), (i1, i2))]
elif isinstance(expr, MatrixElement):
matrix_symbol, i1, i2 = expr.args
if i1 in index_ranges:
r1, r2 = index_ranges[i1]
if r1 != 0 or matrix_symbol.shape[0] != r2+1:
raise ValueError("index range mismatch: {0} vs. (0, {1})".format(
(r1, r2), matrix_symbol.shape[0]))
if i2 in index_ranges:
r1, r2 = index_ranges[i2]
if r1 != 0 or matrix_symbol.shape[1] != r2+1:
raise ValueError("index range mismatch: {0} vs. (0, {1})".format(
(r1, r2), matrix_symbol.shape[1]))
if (i1 == i2) and (i1 in index_ranges):
return [(trace(matrix_symbol), None)]
return [(MatrixElement(matrix_symbol, i1, i2), (i1, i2))]
elif isinstance(expr, Sum):
return recurse_expr(
expr.args[0],
index_ranges={i[0]: i[1:] for i in expr.args[1:]}
)
else:
return [(expr, None)]
def normalization_factor(self):
return 1 / sp.sqrt(sp.trace(self.density_matrix()).simplify())
def test_literature(force_model, stencil, method):
# Be aware that the choice of the conserved moments does not affect the forcing although omega is introduced
# in the forcing vector then. The reason is that:
# m_{100}^{\ast} = m_{100} + \omega ( m_{100}^{eq} - m_{100} ) + \left( 1 - \frac{\omega}{2} \right) F_x
# always simplifies to:
# m_{100}^{\ast} = m_{100} + F_x
# Thus the relaxation rate gets cancled again.
stencil = LBStencil(stencil)
omega_s = sp.Symbol("omega_s")
omega_b = sp.Symbol("omega_b")
omega_o = sp.Symbol("omega_o")
omega_e = sp.Symbol("omega_e")
if method == Method.SRT:
rrs = [omega_s]
omega_o = omega_b = omega_e = omega_s
elif method == Method.TRT:
rrs = [omega_e, omega_o]
omega_s = omega_b = omega_e
else:
rrs = [omega_s, omega_b, omega_o, omega_e, omega_o, omega_e]
F = sp.symbols(f"F_:{stencil.D}")
lbm_config = LBMConfig(method=method,
weighted=True,
stencil=stencil,
relaxation_rates=rrs,
compressible=force_model != ForceModel.BUICK,
force_model=force_model,
force=F)
lb_method = create_lb_method(lbm_config=lbm_config)
omega_momentum = list(set(lb_method.relaxation_rates[1:stencil.D + 1]))
assert len(omega_momentum) == 1
omega_momentum = omega_momentum[0]
subs_dict = lb_method.subs_dict_relxation_rate
force_term = sp.simplify(lb_method.force_model(lb_method).subs(subs_dict))
u = sp.Matrix(lb_method.first_order_equilibrium_moment_symbols)
rho = lb_method.conserved_quantity_computation.zeroth_order_moment_symbol
# see silva2020 for nomenclature
F = sp.Matrix(F)
uf = sp.Matrix(u).dot(F)
F2 = sp.Matrix(F).dot(sp.Matrix(F))
Fq = sp.zeros(stencil.Q, 1)
uq = sp.zeros(stencil.Q, 1)
for i, cq in enumerate(stencil):
Fq[i] = sp.Matrix(cq).dot(sp.Matrix(F))
uq[i] = sp.Matrix(cq).dot(u)
common_plus = 3 * (1 - omega_e / 2)
common_minus = 3 * (1 - omega_momentum / 2)
result = []
if method == Method.MRT and force_model == ForceModel.GUO:
# check against eq. 4.68 from schiller2008thermal
uf = u.dot(F) * sp.eye(len(F))
G = (u * F.transpose() + F * u.transpose() - uf * sp.Rational(2, lb_method.dim)) * sp.Rational(1, 2) * \
(2 - omega_s) + uf * sp.Rational(1, lb_method.dim) * (2 - omega_b)
for direction, w_i in zip(lb_method.stencil, lb_method.weights):
direction = sp.Matrix(direction)
tr = sp.trace(G * (direction * direction.transpose() -
sp.Rational(1, 3) * sp.eye(len(F))))
result.append(3 * w_i *
(F.dot(direction) + sp.Rational(3, 2) * tr))
elif force_model == ForceModel.GUO:
# check against table 2 in silva2020 (correct for SRT and TRT), matches eq. 20 from guo2002discrete (for SRT)
Sq_plus = sp.zeros(stencil.Q, 1)
Sq_minus = sp.zeros(stencil.Q, 1)
for i, w_i in enumerate(lb_method.weights):
Sq_plus[i] = common_plus * w_i * (3 * uq[i] * Fq[i] - uf)
Sq_minus[i] = common_minus * w_i * Fq[i]
result = Sq_plus + Sq_minus
elif force_model == ForceModel.BUICK:
# check against table 2 in silva2020 (correct for all collision models due to the simplicity of Buick),
# matches eq. 18 from silva2010 (for SRT)
Sq_plus = sp.zeros(stencil.Q, 1)
Sq_minus = sp.zeros(stencil.Q, 1)
for i, w_i in enumerate(lb_method.weights):
Sq_plus[i] = 0
Sq_minus[i] = common_minus * w_i * Fq[i]
result = Sq_plus + Sq_minus
elif force_model == ForceModel.EDM:
# check against table 2 in silva2020
if method == Method.MRT:
# for mrt no literature terms are known at the time of writing this test case.
# However it is most likly correct since SRT and TRT are derived from the moment space representation
pytest.skip()
Sq_plus = sp.zeros(stencil.Q, 1)
Sq_minus = sp.zeros(stencil.Q, 1)
for i, w_i in enumerate(lb_method.weights):
Sq_plus[i] = common_plus * w_i * (3 * uq[i] * Fq[i] - uf) + (
(w_i / (8 * rho)) * (3 * Fq[i]**2 - F2))
Sq_minus[i] = common_minus * w_i * Fq[i]
result = Sq_plus + Sq_minus
elif force_model == ForceModel.SHANCHEN:
# check against table 2 in silva2020
if method == Method.MRT:
# for mrt no literature terms are known at the time of writing this test case.
# However it is most likly correct since SRT and TRT are derived from the moment space representation
pytest.skip()
Sq_plus = sp.zeros(stencil.Q, 1)
Sq_minus = sp.zeros(stencil.Q, 1)
for i, w_i in enumerate(lb_method.weights):
Sq_plus[i] = common_plus * w_i * (3 * uq[i] * Fq[i] -
uf) + common_plus**2 * (
(w_i / (2 * rho)) *
(3 * Fq[i]**2 - F2))
Sq_minus[i] = common_minus * w_i * Fq[i]
result = Sq_plus + Sq_minus
assert list(sp.simplify(force_term -
sp.Matrix(result))) == [0] * len(stencil)
def div(u):
return sym.trace(u.jacobian([x, y]))
def recurse_expr(expr, index_ranges={}):
if expr.is_Mul:
nonmatargs = []
matargs = []
pos_arg = []
pos_ind = []
dlinks = {}
link_ind = []
counter = 0
for arg in expr.args:
arg_symbol, arg_indices = recurse_expr(arg, index_ranges)
if arg_indices is None:
nonmatargs.append(arg_symbol)
continue
i1, i2 = arg_indices
pos_arg.append(arg_symbol)
pos_ind.append(i1)
pos_ind.append(i2)
link_ind.extend([None, None])
if i1 in dlinks:
other_i1 = dlinks[i1]
link_ind[2*counter] = other_i1
link_ind[other_i1] = 2*counter
if i2 in dlinks:
other_i2 = dlinks[i2]
link_ind[2*counter + 1] = other_i2
link_ind[other_i2] = 2*counter + 1
dlinks[i1] = 2*counter
dlinks[i2] = 2*counter + 1
counter += 1
cur_ind_pos = link_ind.index(None)
first_index = pos_ind[cur_ind_pos]
while True:
d = cur_ind_pos // 2
r = cur_ind_pos % 2
if r == 1:
matargs.append(transpose(pos_arg[d]))
else:
matargs.append(pos_arg[d])
next_ind_pos = link_ind[2*d + 1 - r]
if next_ind_pos is None:
last_index = pos_ind[2*d + 1 - r]
break
cur_ind_pos = next_ind_pos
return Mul.fromiter(nonmatargs)*MatMul.fromiter(matargs), (first_index, last_index)
elif expr.is_Add:
res = [recurse_expr(i) for i in expr.args]
res = [
((transpose(i), (j[1], j[0]))
if default_sort_key(j[0]) > default_sort_key(j[1])
else (i, j))
for (i, j) in res
]
addends, last_indices = zip(*res)
last_indices = list(set(last_indices))
if len(last_indices) > 1:
print(last_indices)
raise ValueError("incompatible summation")
return MatAdd.fromiter(addends), last_indices[0]
elif isinstance(expr, KroneckerDelta):
i1, i2 = expr.args
return S.One, (i1, i2)
elif isinstance(expr, MatrixElement):
matrix_symbol, i1, i2 = expr.args
if i1 in index_ranges:
r1, r2 = index_ranges[i1]
if r1 != 0 or matrix_symbol.shape[0] != r2+1:
raise ValueError("index range mismatch: {0} vs. (0, {1})".format(
(r1, r2), matrix_symbol.shape[0]))
if i2 in index_ranges:
r1, r2 = index_ranges[i2]
if r1 != 0 or matrix_symbol.shape[1] != r2+1:
raise ValueError("index range mismatch: {0} vs. (0, {1})".format(
(r1, r2), matrix_symbol.shape[1]))
if (i1 == i2) and (i1 in index_ranges):
return trace(matrix_symbol), None
return matrix_symbol, (i1, i2)
elif isinstance(expr, Sum):
return recurse_expr(
expr.args[0],
index_ranges={i[0]: i[1:] for i in expr.args[1:]}
)
else:
return expr, None
def test_matrix_expression_from_index_summation():
from sympy.abc import a, b, c, d
A = MatrixSymbol("A", k, k)
B = MatrixSymbol("B", k, k)
C = MatrixSymbol("C", k, k)
w1 = MatrixSymbol("w1", k, 1)
i0, i1, i2, i3, i4 = symbols("i0:5", cls=Dummy)
expr = Sum(W[a, b] * X[b, c] * Z[c, d], (b, 0, l - 1), (c, 0, m - 1))
assert MatrixExpr.from_index_summation(expr, a) == W * X * Z
expr = Sum(W.T[b, a] * X[b, c] * Z[c, d], (b, 0, l - 1), (c, 0, m - 1))
assert MatrixExpr.from_index_summation(expr, a) == W * X * Z
expr = Sum(A[b, a] * B[b, c] * C[c, d], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T * B * C
expr = Sum(A[b, a] * B[c, b] * C[c, d], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T * B.T * C
expr = Sum(C[c, d] * A[b, a] * B[c, b], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixSymbol.from_index_summation(expr, a) == A.T * B.T * C
expr = Sum(A[a, b] + B[a, b], (a, 0, k - 1), (b, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == A + B
expr = Sum((A[a, b] + B[a, b]) * C[b, c], (b, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == (A + B) * C
expr = Sum((A[a, b] + B[b, a]) * C[b, c], (b, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == (A + B.T) * C
expr = Sum(A[a, b] * A[b, c] * A[c, d], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == A**3
expr = Sum(A[a, b] * A[b, c] * B[c, d], (b, 0, k - 1), (c, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == A**2 * B
# Parse the trace of a matrix:
expr = Sum(A[a, a], (a, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, None) == trace(A)
expr = Sum(A[a, a] * B[b, c] * C[c, d], (a, 0, k - 1), (c, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, b) == trace(A) * B * C
# Check wrong sum ranges (should raise an exception):
## Case 1: 0 to m instead of 0 to m-1
expr = Sum(W[a, b] * X[b, c] * Z[c, d], (b, 0, l - 1), (c, 0, m))
raises(ValueError, lambda: MatrixExpr.from_index_summation(expr, a))
## Case 2: 1 to m-1 instead of 0 to m-1
expr = Sum(W[a, b] * X[b, c] * Z[c, d], (b, 0, l - 1), (c, 1, m - 1))
raises(ValueError, lambda: MatrixExpr.from_index_summation(expr, a))
# Parse nested sums:
expr = Sum(A[a, b] * Sum(B[b, c] * C[c, d], (c, 0, k - 1)), (b, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == A * B * C
# Test Kronecker delta:
expr = Sum(A[a, b] * KroneckerDelta(b, c) * B[c, d], (b, 0, k - 1),
(c, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, a) == A * B
expr = Sum(
KroneckerDelta(i1, m) * KroneckerDelta(i2, n) * A[i, i1] * A[j, i2],
(i1, 0, k - 1),
(i2, 0, k - 1),
)
assert MatrixExpr.from_index_summation(expr, m) == A.T * A[j, n]
# Test numbered indices:
expr = Sum(A[i1, i2] * w1[i2, 0], (i2, 0, k - 1))
assert MatrixExpr.from_index_summation(expr, i1) == A * w1
expr = Sum(A[i1, i2] * B[i2, 0], (i2, 0, k - 1))
assert MatrixExpr.from_index_summation(expr,
i1) == MatrixElement(A * B, i1, 0)
def _trace_single_line(t):
"""
Evaluate the trace of a single gamma matrix line inside a ``TensExpr``.
Notes
=====
If there are ``DiracSpinorIndex.auto_left`` and ``DiracSpinorIndex.auto_right``
indices trace over them; otherwise traces are not implied (explain)
Examples
========
>>> from sympy.physics.hep.gamma_matrices import GammaMatrix as G, \
LorentzIndex, _trace_single_line
>>> from sympy.tensor.tensor import tensor_indices, tensorhead
>>> p = tensorhead('p', [LorentzIndex], [[1]])
>>> i0,i1,i2,i3,i4,i5 = tensor_indices('i0:6', LorentzIndex)
>>> _trace_single_line(G(i0)*G(i1))
4*metric(i0, i1)
>>> _trace_single_line(G(i0)*p(-i0)*G(i1)*p(-i1)) - 4*p(i0)*p(-i0)
0
"""
def _trace_single_line1(t):
t = t.sorted_components()
components = t.components
ncomps = len(components)
g = LorentzIndex.metric
# gamma matirices are in a[i:j]
hit = 0
for i in range(ncomps):
if components[i] == GammaMatrix:
hit = 1
break
for j in range(i + hit, ncomps):
if components[j] != GammaMatrix:
break
else:
j = ncomps
numG = j - i
if numG == 0:
tcoeff = t.coeff
return t.nocoeff if tcoeff else t
if numG % 2 == 1:
return TensMul.from_data(S.Zero, [], [], [])
elif numG > 4:
# find the open matrix indices and connect them:
a = t.split()
ind1 = a[i].get_indices()[0]
ind2 = a[i + 1].get_indices()[0]
aa = a[:i] + a[i + 2:]
t1 = tensor_mul(*aa)*g(ind1, ind2)
t1 = t1.contract_metric(g)
args = [t1]
sign = 1
for k in range(i + 2, j):
sign = -sign
ind2 = a[k].get_indices()[0]
aa = a[:i] + a[i + 1:k] + a[k + 1:]
t2 = sign*tensor_mul(*aa)*g(ind1, ind2)
t2 = t2.contract_metric(g)
t2 = simplify_gpgp(t2, False)
args.append(t2)
t3 = TensAdd(*args)
t3 = _trace_single_line(t3)
return t3
else:
a = t.split()
t1 = _gamma_trace1(*a[i:j])
a2 = a[:i] + a[j:]
t2 = tensor_mul(*a2)
t3 = t1*t2
if not t3:
return t3
t3 = t3.contract_metric(g)
return t3
if isinstance(t, TensAdd):
a = [_trace_single_line1(x)*x.coeff for x in t.args]
return TensAdd(*a)
elif isinstance(t, (Tensor, TensMul)):
r = t.coeff*_trace_single_line1(t)
return r
else:
return trace(t)
def recurse_expr(expr, index_ranges={}):
if expr.is_Mul:
nonmatargs = []
pos_arg = []
pos_ind = []
dlinks = {}
link_ind = []
counter = 0
args_ind = []
for arg in expr.args:
retvals = recurse_expr(arg, index_ranges)
assert isinstance(retvals, list)
if isinstance(retvals, list):
for i in retvals:
args_ind.append(i)
else:
args_ind.append(retvals)
for arg_symbol, arg_indices in args_ind:
if arg_indices is None:
nonmatargs.append(arg_symbol)
continue
if isinstance(arg_symbol, MatrixElement):
arg_symbol = arg_symbol.args[0]
pos_arg.append(arg_symbol)
pos_ind.append(arg_indices)
link_ind.append([None]*len(arg_indices))
for i, ind in enumerate(arg_indices):
if ind in dlinks:
other_i = dlinks[ind]
link_ind[counter][i] = other_i
link_ind[other_i[0]][other_i[1]] = (counter, i)
dlinks[ind] = (counter, i)
counter += 1
counter2 = 0
lines = {}
while counter2 < len(link_ind):
for i, e in enumerate(link_ind):
if None in e:
line_start_index = (i, e.index(None))
break
cur_ind_pos = line_start_index
cur_line = []
index1 = pos_ind[cur_ind_pos[0]][cur_ind_pos[1]]
while True:
d, r = cur_ind_pos
if pos_arg[d] != 1:
if r % 2 == 1:
cur_line.append(transpose(pos_arg[d]))
else:
cur_line.append(pos_arg[d])
next_ind_pos = link_ind[d][1-r]
counter2 += 1
# Mark as visited, there will be no `None` anymore:
link_ind[d] = (-1, -1)
if next_ind_pos is None:
index2 = pos_ind[d][1-r]
lines[(index1, index2)] = cur_line
break
cur_ind_pos = next_ind_pos
ret_indices = list(j for i in lines for j in i)
lines = {k: MatMul.fromiter(v) if len(v) != 1 else v[0] for k, v in lines.items()}
return [(Mul.fromiter(nonmatargs), None)] + [
(MatrixElement(a, i, j), (i, j)) for (i, j), a in lines.items()
]
elif expr.is_Add:
res = [recurse_expr(i) for i in expr.args]
d = collections.defaultdict(list)
for res_addend in res:
scalar = 1
for elem, indices in res_addend:
if indices is None:
scalar = elem
continue
indices = tuple(sorted(indices, key=default_sort_key))
d[indices].append(scalar*remove_matelement(elem, *indices))
scalar = 1
return [(MatrixElement(Add.fromiter(v), *k), k) for k, v in d.items()]
elif isinstance(expr, KroneckerDelta):
i1, i2 = expr.args
if dimensions is not None:
identity = Identity(dimensions[0])
else:
identity = S.One
return [(MatrixElement(identity, i1, i2), (i1, i2))]
elif isinstance(expr, MatrixElement):
matrix_symbol, i1, i2 = expr.args
if i1 in index_ranges:
r1, r2 = index_ranges[i1]
if r1 != 0 or matrix_symbol.shape[0] != r2+1:
raise ValueError("index range mismatch: {0} vs. (0, {1})".format(
(r1, r2), matrix_symbol.shape[0]))
if i2 in index_ranges:
r1, r2 = index_ranges[i2]
if r1 != 0 or matrix_symbol.shape[1] != r2+1:
raise ValueError("index range mismatch: {0} vs. (0, {1})".format(
(r1, r2), matrix_symbol.shape[1]))
if (i1 == i2) and (i1 in index_ranges):
return [(trace(matrix_symbol), None)]
return [(MatrixElement(matrix_symbol, i1, i2), (i1, i2))]
elif isinstance(expr, Sum):
return recurse_expr(
expr.args[0],
index_ranges={i[0]: i[1:] for i in expr.args[1:]}
)
else:
return [(expr, None)]
def one_parameter_analysis(f1, f2, param_values, k2_bot, k2_top, const1,
const2):
"""
One-parameter analysis
The analysis is performed by parameter k2
"""
jac_A = Matrix([f1, f2]).jacobian(Matrix([x, y]))
param_dict = deepcopy(param_values)
del param_dict[k2]
f1_subs = f1.subs([(key, value) for key, value in param_dict.items()])
f2_subs = f2.subs([(key, value) for key, value in param_dict.items()])
solution = solve([f1_subs, f2_subs], x, k2, dict=True)[0]
y_list = np.linspace(0, 1, 1000)
y_final = deepcopy(y_list)
x_list = []
k2_list = []
j = 0
for i, val in enumerate(y_list):
curr_x = re(solution[x].subs({y: val}))
curr_k2 = re(solution[k2].subs({y: val}))
if not (0 <= curr_x <= 1) or not (0 <= val + curr_x <= 1):
y_final = np.delete(y_final, i - j)
j += 1
continue
x_list.append(curr_x)
k2_list.append(curr_k2)
y_list = y_final
jac_subs = jac_A.subs([(key, value) for key, value in param_dict.items()])
jac_subs_listed = [
jac_subs.subs({
y: val,
x: x_list[i],
k2: k2_list[i]
}) for i, val in enumerate(y_list)
]
det_list = []
trace_list = []
for jac in jac_subs_listed:
det_list.append(jac.det())
trace_list.append(trace(jac))
for i in range(2, len(det_list)):
if det_list[i] * det_list[i - 1] <= const1:
plt.plot(k2_list[i], x_list[i], 'rx', label='saddle-node')
plt.plot(k2_list[i], y_list[i], 'rx', label='saddle-node')
if trace_list[i] * trace_list[i - 1] <= const2:
plt.plot(k2_list[i], x_list[i], 'go', label='hopf')
plt.plot(k2_list[i], y_list[i], 'go', label='hopf')
plt.plot(k2_list, x_list, linewidth=1.5, label='k2(x)')
plt.plot(k2_list, y_list, linestyle='--', linewidth=1.5, label='k2(y)')
plt.xlabel('k2')
plt.ylabel('x, y')
plt.xlim(k2_bot, k2_top)
plt.ylim(0.0, 1.0)
plt.show()
