def __lt__(self, other):
try:
other = _sympify(other)
except SympifyError:
return False # sympy > other
if isinstance(other, NumberSymbol):
return other.__ge__(self)
if other.is_comparable: other = other.evalf()
if isinstance(other, Number):
return bool(mlib.mpf_lt(self._mpf_, other._as_mpf_val(self._prec)))
return Basic.__lt__(self, other)
def __lt__(self, other):
try:
other = _sympify(other)
except SympifyError:
return False # sympy > other
if isinstance(other, NumberSymbol):
return other.__ge__(self)
if other.is_comparable: other = other.evalf()
if isinstance(other, Number):
return bool(mlib.mpf_lt(self._mpf_, other._as_mpf_val(self._prec)))
return Basic.__lt__(self, other)
def __lt__(self, other):
try:
other = _sympify(other)
except SympifyError:
return False # sympy > other --> not <
if isinstance(other, NumberSymbol):
return other.__ge__(self)
if other.is_comparable and not isinstance(other, Rational): other = other.evalf()
if isinstance(other, Number):
if isinstance(other, Real):
return bool(mlib.mpf_lt(self._as_mpf_val(other._prec), other._mpf_))
return bool(self.p * other.q < self.q * other.p)
return Basic.__lt__(self, other)
def __lt__(self, other):
try:
other = _sympify(other)
except SympifyError:
return False # sympy > other --> not <
if isinstance(other, NumberSymbol):
return other.__ge__(self)
if other.is_comparable and not isinstance(other, Rational): other = other.evalf()
if isinstance(other, Number):
if isinstance(other, Real):
return bool(mlib.mpf_lt(self._as_mpf_val(other._prec), other._mpf_))
return bool(self.p * other.q < self.q * other.p)
return Basic.__lt__(self, other)
def evalf_pow(v, prec, options):
target_prec = prec
base, exp = v.args
# We handle x**n separately. This has two purposes: 1) it is much
# faster, because we avoid calling evalf on the exponent, and 2) it
# allows better handling of real/imaginary parts that are exactly zero
if exp.is_Integer:
p = exp.p
# Exact
if not p:
return fone, None, prec, None
# Exponentiation by p magnifies relative error by |p|, so the
# base must be evaluated with increased precision if p is large
prec += int(math.log(abs(p),2))
re, im, re_acc, im_acc = evalf(base, prec+5, options)
# Real to integer power
if re and not im:
return mpf_pow_int(re, p, target_prec), None, target_prec, None
# (x*I)**n = I**n * x**n
if im and not re:
z = fpowi(im, p, target_prec)
case = p % 4
if case == 0: return z, None, target_prec, None
if case == 1: return None, z, None, target_prec
if case == 2: return mpf_neg(z), None, target_prec, None
if case == 3: return None, mpf_neg(z), None, target_prec
# Zero raised to an integer power
if not re:
return None, None, None, None
# General complex number to arbitrary integer power
re, im = libmpc.mpc_pow_int((re, im), p, prec)
# Assumes full accuracy in input
return finalize_complex(re, im, target_prec)
# Pure square root
if exp is S.Half:
xre, xim, xre_acc, yim_acc = evalf(base, prec+5, options)
# General complex square root
if xim:
re, im = libmpc.mpc_sqrt((xre or fzero, xim), prec)
return finalize_complex(re, im, prec)
if not xre:
return None, None, None, None
# Square root of a negative real number
if mpf_lt(xre, fzero):
return None, mpf_sqrt(mpf_neg(xre), prec), None, prec
# Positive square root
return mpf_sqrt(xre, prec), None, prec, None
# We first evaluate the exponent to find its magnitude
# This determines the working precision that must be used
prec += 10
yre, yim, yre_acc, yim_acc = evalf(exp, prec, options)
# Special cases: x**0
if not (yre or yim):
return fone, None, prec, None
ysize = fastlog(yre)
# Restart if too big
# XXX: prec + ysize might exceed maxprec
if ysize > 5:
prec += ysize
yre, yim, yre_acc, yim_acc = evalf(exp, prec, options)
# Pure exponential function; no need to evalf the base
if base is S.Exp1:
if yim:
re, im = libmpc.mpc_exp((yre or fzero, yim), prec)
return finalize_complex(re, im, target_prec)
return mpf_exp(yre, target_prec), None, target_prec, None
xre, xim, xre_acc, yim_acc = evalf(base, prec+5, options)
# 0**y
if not (xre or xim):
return None, None, None, None
# (real ** complex) or (complex ** complex)
if yim:
re, im = libmpc.mpc_pow((xre or fzero, xim or fzero), (yre or fzero, yim),
target_prec)
return finalize_complex(re, im, target_prec)
# complex ** real
if xim:
re, im = libmpc.mpc_pow_mpf((xre or fzero, xim), yre, target_prec)
return finalize_complex(re, im, target_prec)
# negative ** real
elif mpf_lt(xre, fzero):
re, im = libmpc.mpc_pow_mpf((xre, fzero), yre, target_prec)
return finalize_complex(re, im, target_prec)
# positive ** real
else:
return mpf_pow(xre, yre, target_prec), None, target_prec, None
