def loadData(path="../data/",k=5,log='add',pca_n=0,SEED=34):
from pandas import DataFrame, read_csv
from numpy import log as ln
from sklearn.cross_validation import KFold
from sklearn.preprocessing import LabelEncoder
from sklearn.preprocessing import StandardScaler
train = read_csv(path+"train.csv")
test = read_csv(path+"test.csv")
id = test.id
target = train.target
encoder = LabelEncoder()
target_nnet = encoder.fit_transform(target).astype('int32')
feat_names = [x for x in train.columns if x.startswith('feat')]
train = train[feat_names].astype(float)
test = test[feat_names]
if log == 'add':
for v in train.columns:
train[v+'_log'] = ln(train[v]+1)
test[v+'_log'] = ln(test[v]+1)
elif log == 'replace':
for v in train.columns:
train[v] = ln(train[v]+1)
test[v] = ln(test[v]+1)
if pca_n > 0:
from sklearn.decomposition import PCA
pca = PCA(pca_n)
train = pca.fit_transform(train)
test = pca.transform(test)
scaler = StandardScaler()
scaler.fit(train)
train = DataFrame(scaler.transform(train),columns=['feat_'+str(x) for x in range(train.shape[1])])
test = DataFrame(scaler.transform(test),columns=['feat_'+str(x) for x in range(train.shape[1])])
cv = KFold(len(train), n_folds=k, shuffle=True, random_state=SEED)
return train, test, target, target_nnet, id, cv, encoder
def GKB_1(u_zref, zref, h, LAI, Wfol, Ta, pa): """Same as FKB_1, but then for spatial in- and output""" # Constants C_d = 0.2 # foliage drag coefficient C_t = 0.05 # heat transfer coefficient k = 0.41 # Von Karman constant Pr = 0.7 # Prandtl number hs = 0.009 # height of soil roughness obstacles (0.009-0.024) # Calculations Wsoil = 1.0 - Wfol h = ifthenelse(Wfol == 0.0, hs, h) z0 = 0.136 * h # Brutsaert (1982) u_h0 = u_zref * ln(2.446) / ln ((zref - 0.667 * h)/z0) # wind speed at canopy height ust2u_h = 0.32 - 0.264 / exp(15.1 * C_d * LAI) ustarh = ust2u_h * u_h0 nu0 = 1.327E-5 * (101325.0/pa) * (Ta / 273.15 + 1.0) ** 1.81 # kinematic viscosity n_h = C_d * LAI / (2.0 * ust2u_h ** 2.0) # First term F1st = ifthenelse(pcrne(n_h, 0.0), k * C_d / (4.0 * C_t * ust2u_h * (1.0 - exp(pcrumin(n_h)/2.0))) * Wfol ** 2.0, 0.0) # Second term S2nd = k * ust2u_h * 0.136 * Pr ** (2.0/3.0) * sqrt(ustarh * h / nu0) * Wfol ** 2.0 * Wsoil ** 2.0 # Third term T3rd = (2.46 * (u_zref * k / ln(zref/hs) * hs / nu0) ** 0.25 - ln(7.4)) * Wsoil ** 2.0 return F1st + S2nd + T3rd
def binary_logistic_classification(X,y):
"""returns the weights vector"""
from numpy import array, ones, zeros, c_, exp, log as ln
#hyperparameters:
λ = 0.0001
η = 0.05
max_iter = 1000
tol = 0.1
#initialize:
m,n = X.shape
x0 = ones(m)
X = c_[x0, X]
y = y.reshape(-1,1)
θ = zeros(n+1).reshape(-1,1)
for epoch in range(max_iter):
z = X @ θ
p = 1 / (1 + exp(-z))
ε = p - y
θ_ = array([0, *θ[1:]]).reshape(-1,1) # no regularization for the bias
g = (X.T @ ε + λ*θ_) / m
θ = θ - η*g
#check convergence
J = -(ln(p)*y + ln(1-p)*(1-y)).sum() / m
if J < tol: break
else: print("increase the number of max iterations")
return(θ)
def pdf_x_0(L, l, delta, dv):
if -L / 2 + l / 2 + dv < delta < L / 2 - l / 2 - dv:
return 1 / l * ln(L / (L - l))
if L / 2 - l / 2 - dv < delta < L / 2 - l / 2 + dv:
return 0
if (delta > L / 2. - l / 2. + dv) and (delta > L / 2. - l / 2. - dv):
return 1 / l * ln(L / (2 * delta))
def q710(flow, dates):
'''
Parameters
----------
flow : list
Série de vazões.
dates : list
Datas referentes a cada uma das vazões.
Returns
-------
q : float
Vazão mínima de 7 dias com 10 anos de retorno.
'''
mean = [np.mean(flow[i:i + 7])
for i in range(len(flow) - 7)] # media movel de 7 dias
dates = dates[7:] # datas referente as medias
df = pd.DataFrame(mean, index=dates,
columns=['flow']) # dataframe reunido vazoes e datas
df.index = pd.to_datetime(df.index) # converte datas para datatype
df['year'] = [x.year
for x in df.index] # cria coluna com informacao dos anos
df_min = df.groupby(df.index.year).transform(
'min').drop_duplicates() # calcula vazoes minimas de cada ano
x_mean = df_min['flow'].mean()
s = df_min['flow'].std()
q = x_mean + s * (0.45 + 0.7797 * np.ln(np.ln(10 / 9)))
return q
def calc_fetch_factor(self):
"""
Calculate fetch factor, defined as ratio between local friction
velocity and equilibrium friction velocity
"""
X = self.X
# Parameters relating to upwind site
z0_X = self.z0_X
SE_X = self.S_exposure_X
# Parameters relating to site
z0 = self.z0
SE = self.S_exposure
if not all([X, z0, z0_X, SE, SE_X]):
print([X, z0, z0_X, SE, SE_X])
raise ValueError("Not all parameters initialised!")
# Determine m0
m0 = calc_m0(X=X, z0=z0)
# Determine fetch factor
term1 = 1 - ln(z0_X / z0) / (0.42 + ln(m0))
term2 = SE_X / ln(10 / z0_X)
term3 = ln(10 / z0) / SE
SX_X = term1 * term2 * term3
return SX_X
def calc_iu(self, apply_cook_correction=True):
"""
Calculate along-wind turbulence intensity per Deaves and Harris
"""
zg = self.zg
z0 = self.z0
d = self.d
z = self.get_z()
# Define non-dimensional heights used in expression
z_rel_g = (z - d) / zg
z_rel_0 = (z - d) / z0
num = 3 * (1 - z_rel_g) * ((0.538 + 0.09 * ln(z_rel_0))**(
(1 - z_rel_g)**(16)))
denom2 = 1 + 0.156 * ln(6 * zg / z0)
denom1 = ln(z_rel_0)
if apply_cook_correction:
# Augment with additional terms per numerator
# f eqn (9.12) in Cook Part 1
denom1 += 5.75 * z_rel_g - 1.875 * z_rel_g**2 - (
4 / 3) * z_rel_g**3 + (1 / 4) * z_rel_g**4
i_u = num / (denom1 * denom2)
self.i_u = i_u
return i_u
def compute_horizontal_vessel_purchase_cost(W, D, F_M):
"""
Return the purchase cost [Cp; in USD] of a horizontal vessel,
including the cost of platforms and ladders.
Parameters
----------
W : float
Weight [lb].
D : float
Diameter [ft].
F_M : float
Vessel material factor.
Notes
-----
The purchase cost is given by [1]_. See source code for details.
The purchase cost is scaled according to BioSTEAM's Chemical
Plant Cost Index, `biosteam.CE`.
"""
# C_v: Vessel cost
# C_pl: Platforms and ladders cost
C_v = exp(5.6336 - 0.4599 * ln(W) + 0.00582 * ln(W)**2)
C_pl = 2275 * D**0.20294
return bst.CE / 567 * (F_M * C_v + C_pl)
def area_scheme_4(x1, x2, y1, y2):
dx, dy = x2 - x1, y2 - y1
dlny = ln(y2) - ln(y1)
# m = dlny/dx
return np.nan_to_num(
dy / dlny, nan=y1, posinf=y1,
neginf=y1) * dx # nan_to_num is needed to take care of y2 = y1,
def pdf_x(L, l, delta, dv):
if -L / 2 + l / 2 + dv < delta < L / 2 - l / 2 - dv:
return 2 * dv / l * ln(L / (L - l))
if L / 2 - l / 2 - dv < delta < L / 2 - l / 2 + dv:
return 1 / 2. + 1 / l * ((delta - dv) * ln(L - l) + (delta + dv) * (1 - ln(2 * (delta + dv))) + 2 * dv * ln(L) - L / 2.)
if (delta > L / 2. - l / 2. + dv) and (delta > L / 2. - l / 2. - dv):
return 1 / l * (2 * dv * (1 + ln(L / 2.)) - (delta + dv) * ln(delta + dv) + (delta - dv) * ln(delta - dv))
def find_microstrip_width(er, d, z0=50.):
"""Calculate microstrip width required for a given characteristic
impedance.
Args:
er (float): relative permittivity
d (float): thickness of the dielectric in [m]
z0 (float): desired characterisitic impedance in [ohm]
Returns:
float: width of microstrip in [m]
"""
a = z0 / 60 * sqrt((er + 1) / 2) + (er - 1) / (er + 1) * (0.23 + 0.11 / er)
b = 60 * pi**2 / (z0 * sqrt(er))
# Eqn. 3.197 in Pozar
wd1 = 8 * exp(a) / (exp(2 * a) - 2)
wd2 = 2 / pi * (b - 1 - ln(2 * b - 1) + (er - 1) / (2 * er) *
(ln(b - 1) + 0.39 - 0.61 / er))
if isinstance(wd1, float):
if a > 1.52:
return wd1 * d
elif wd2 >= 2:
return wd2 * d
elif isinstance(wd1, np.ndarray):
wd = np.empty_like(wd1)
mask = a > 1.52
wd[mask] = wd1[mask]
wd[~mask] = wd2[~mask]
return wd * d
def compute_vertical_vessel_purchase_cost(W, D, L, F_M):
"""
Return the purchase cost [Cp; in USD] of a vertical vessel,
including the cost of platforms and ladders.
Parameters
----------
W : float
Weight [lb].
D : float
Diameter [ft].
L : float
Length [ft].
F_M : float
Vessel material factor.
Notes
-----
The purchase cost is given by [1]_. See source code for details.
The purchase cost is scaled according to BioSTEAM's Chemical
Plant Cost Index, `biosteam.CE`.
"""
# C_v: Vessel cost
# C_pl: Platforms and ladders cost
C_v = exp(7.1390 + 0.18255 * ln(W) + 0.02297 * ln(W)**2)
C_pl = 410 * D**0.7396 * L**0.70684
return bst.CE / 567 * (F_M * C_v + C_pl)
def SimhaEllipsoids(self, phi, d_p, p):
# valid for p>>1
lam = 1.8
nu = 8 / 5 + p**2 * (15 * np.ln(2 * p) -
lam)**-1 + p**2 * (5 * np.ln(2 * p) - lam + 1)**-1
visc = 1 + nu * phi
return visc
def bisection_method(f, range2, eps):
# print(range2)
err = ((-1) * ln(eps / (range2[1] - range2[0]))) / ln(2)
a = range2[0]
ya = f(a) # numpy.longdouble(f(a))
b = range2[1]
yb = f(b) # numpy.longdouble(f(b))
c = (b + a) / 2
yc = f(c) # numpy.longdouble(f(c))
# c_prev = eps
n = 1
while n < err:
c_prev = c
if ya * yc < 0:
b = c
yb = yc
# elif yc * yb < 0:
elif ya * yc >= 0:
a = c
ya = yc
else:
return None
c = (b + a) / 2
yc = f(c) # numpy.longdouble(f(c))
++n # next row done
if abs(c - c_prev) < eps:
return c
def _get_I_total(R0, d, t):
A = np.ln(R0)
B = np.ln(1 + d)
mu = 0.5 * A / B
I = 0.5 * np.exp(0.25 * A**2 / B * np.sqrt(np.pi / B))
I = I * np.sqrt(B) * (np.erf(t - mu) - np.erf(-mu))
return I
def compute_Stokes_law_York_Demister_K_value(P):
"""
Return K-constant in Stoke's Law using the York-Demister equation.
Parameters
----------
P : float
Pressure [psia].
Examples
--------
>>> compute_Stokes_law_York_Demister_K_value(14)
0.34409663
>>> compute_Stokes_law_York_Demister_K_value(20)
0.35
>>> compute_Stokes_law_York_Demister_K_value(125)
0.31894878
Notes
-----
Equations are given by [2]_. See source code for details.
"""
if P >= 0 and P <= 15.0:
K = 0.1821 + (0.0029 * P) + (0.046 * ln(P))
elif P > 15.0 and P <= 40.0:
K = 0.35
elif P > 40.0 and P <= 5500.0:
K = 0.43 - 0.023 * ln(P)
elif P < 0:
raise ValueError('invalid Pressure of over 5500 psia')
else:
raise ValueError('invalid Pressure of over 5500 psia')
return K
def SimhaRods(self, phi, d_p, p=10):
# valid for p>>1
lam = 1.5
nu = 8 / 5 + p**2 * (15 * np.ln(2 * p) -
lam)**-1 + p**2 * (5 * np.ln(2 * p) - lam + 1)**-1
visc = 1 + nu * phi
return visc
def __init__(
self,
table = '1110', # NAND table (a two bit address is expected)
width = 1, # data bus width, one bit output
name = None): # device name: None, use generic
# check if table is a path to the table data
if not self.tableCheck(table):
# if table is a path, import table
table = self.tableImport(table)
# call parent class constructor
Device.__init__(self, name)
# find number of words
words = ceil(len(table)/width)
# size in power of 2
size = ceil(ln(words)/ln(2))
# complete table up to 2^size
table += 'U'*(2**size-words)*width
# record configuration
self.configuration = size, width, table
# instantiate output port
self.Q = outPort(width, "Q")
# register port
self.outports.append(self.Q)
# set default output port value
self.Q.set(table[0:width])
# done
return
def bisection_method(a, b, e, func):
if func(a) * func(b) > 0.0:
print('Try Again with different guess values')
else:
step = 1
err = 10**-10
error_check = -(ln(err / abs(b - a)) / (ln(2)))
condition = True
while condition:
if step > error_check:
print("The function does not match the bisection method")
exit(0)
m = (a + b) / 2
if func(a) * func(m) < 0:
b = m
else:
a = m
step += 1
condition = abs(func(m)) > e
if func.__name__ == "derivative_of_f":
if f(round(m, 1)) == 0.0:
result.append(m)
else:
result.append(m)
def B_func(Th33, Th1500):
"""calculates the coefficient of moisture-tension, used for water flux estimation"""
if Th33 <= 0.0:
Th33 = 0.4
rwarn("Th33 < 0")
if np.isneginf(Th33) or np.isposinf(Th33) or not Th33 == Th33:
Th33 = 0.4
rwarn("Th33 is NaN or inf")
if Th1500 <= 0.0:
Th1500 = 0.2
rwarn("Th1500 <= 0")
if np.isneginf(Th1500) or np.isposinf(Th1500) or not Th1500 == Th1500:
Th1500 = 0.2
rwarn("Th1500 is NaN or inf")
D = ln(Th33) - ln(Th1500)
B = (ln(1500) - ln(33)) / D
def lbd_func(C):
"""processes the data from B_func, returning the slope of logarithmic tension-moisture curve"""
if C == 0:
return 0.0
lbd = 1 / C
return lbd
return lbd_func(B)
def probability_cut_nooverlaps(lc, lf, delta):
"""
Probability that we cut fiber of nooverlapped fibers
"""
# type I and III
if (lf <= lc / 2.0 - delta) and (lf <= lc / 2.0 + delta):
# print "Varianta I or III ",
return lc / lf * (ln(lc / (lc - lf))) - 1
# type II
if (lf < lc / 2.0 + delta) and (lf > lc / 2.0 - delta):
# print "Varianta II ",
return (
1
/ 2.0
/ lf
* (
(lc + 2.0 * delta) * ln(2.0 / (lc + 2.0 * delta))
- (ln(lc - lf) + 1) * (lc - 2.0 * delta)
+ 2.0 * lc * ln(lc)
)
)
# type IV
if (lf >= lc / 2.0 + delta) and (lf >= lc / 2.0 - delta):
# print "Varianta IV ",
return 1 + 1 / lf * (
-lc + (lc / 2.0 - delta) * ln((lc + 2 * delta) / (lc - 2 * delta)) + lc * ln(2 * lc / (lc + 2 * delta))
)
def _get_I_total(R0, d, t):
A = np.ln(R0)
B = np.ln(1+ d)
mu = 0.5 * A / B
I = 0.5 * np.exp( 0.25 * A**2 / B * np.sqrt( np.pi / B))
I = I * np.sqrt(B) * (np.erf(t - mu)- np.erf(-mu))
return I
def Gaussianfit(xlist, ylist):
"""Computes a gaussian fit in accordance to method of least square in terms of two list that are given."""
if not isinstance((xlist, ylist), (np.generic, np.ndarray)):
if isinstance((xlist, ylist), (list, tuple)):
xlist = np.array(xlist)
ylist = np.array([[arg] for arg in ylist])
else:
raise TypeError(
"[GaussianFit] Can't make Gaussianfit with given input")
if len(xlist) < 4 and len(xlist) == len(ylist):
raise KeyError(
"[GaussianFit] Can't make Gaussianfit due to too few values given")
else:
Error = lambda y, A, x, mu, sigma: np.ln(y) - (np.ln(A) - mu**2 / (
2 * sigma**2) + 2 * mu * sigma / (2 * sigma**2) - x**2 /
(2 * sigma**2))
Constant_a = np.ones(len(xlist))
line1 = np.ones(len(xlist))
MatrixA = np.array([np.ones(len(xlist)), xlist, xlist**2]).T
MatrixAT = MatrixA.T
try:
InverseA = np.linalg.inv(MatrixAT.dot(MatrixA))
ylist2 = np.log(ylist)
ylist3 = MatrixAT.dot(ylist2)
Constants = InverseA.dot(ylist3)
except Exception as E:
raise E
sigma = np.sqrt(-1 / (2 * Constants[2]))
mu = Constants[1] * sigma**2
A = np.exp(Constants[0] + mu**2 / (2 * sigma**2))
print(A, mu, sigma)
print(Constants[0])
function = lambda x: A * np.exp(-(x - mu)**2 / (2 * sigma**2))
return function
def Ar(z, lf):
#z is the dist between the
lf = np.float(lf)
#######################
#int#
#######################
if type(z) == int:
if z == 0:
return 1
if z == lf / 2:
return 0
return lf * (lf - 2. * z + 2. * z * (.6931471806 + ln((1. / lf) * z))) / (lf - 2. * z) ** 2
#######################
#ARRAY#
#######################
res = 2 * z / lf * (ln(2 * z / lf) - 1) + 1
if any(z == lf / 2):
z = list(z)
ind_h = z.index(lf / 2)
res[ind_h] = 0
z = np.array(z)
if any(z == 0):
z = list(z)
ind_z = z.index(0)
res[ind_z] = 1
z = np.array(z)
return res
def G_vonKarman(z,
f,
U_ref=20.0,
z_ref=10.0,
z0=0.05,
Lx=120.0,
make_plot=False):
"""
Von Karman expression for along-wind turbulence autospectrum
z : Height above ground (m), 1D array expected
f : Frequency (Hz), 1D array expected
U_10 : mean wind speed at height z_ref (m/s)
z_ref : reference height for mean wind speed (m) - see above
z0 : ground roughness (m)
Lx : along-wind turbulence length scale
"""
# Determine shear velocity
u_star = 0.4 * U_ref / ln(z_ref / z0)
# Calculate mean wind speed at heights requested
U_z = u_star / 0.4 * ln(z / z0)
# Calculate Lx at each height
if isinstance(Lx, float):
Lx_z = Lx * numpy.ones((len(z), ))
else:
# Assume function provided
Lx_z = Lx(z)
# Determine along-wind turbulence spectrum at requested frequencies
Gv = numpy.empty((len(f), len(U_z)))
for i, (U, Lx) in enumerate(zip(U_z, Lx_z)):
numerator = 4 * (5.7 * u_star**2) * (Lx / U)
denominator = 1.339 * (1 + 39.48 * (f * Lx / U)**2)**(5 / 6)
Gv[:, i] = numerator / denominator
if make_plot:
fig, axarr = plt.subplots(2, sharex=True)
ax = axarr[0]
ax.plot(f, Gv)
ax = axarr[1]
ax.plot(fm, numpy.abs((Gv.T * f).T))
ax.set_xlim([-fs / 2, +fs / 2])
ax.set_xlabel("Frequency f (Hz)")
ax.set_ylabel("f.G(f)")
#ax.set_xscale("log")#, nonposy='clip')
ax.set_yscale("log") #, nonposy='clip')
return Gv, U_z
def chi(self, phi1, phi2):
"""calculate chi from ph1 and phi2
this is a rearrangement of the equation dfmix_by_dphi(phi1,chi)=dfmix_by_dphi(phi2,chi)
for chi where phi1 and phi2 are the volume fractions of protein in the dilute and condensed
phases, respectively.
"""
return (1. / self.N1 * ln(phi2 / phi1) + 1. / self.N2 * ln(
(1 - phi1) / (1 - phi2))) / (2. * phi2 - 2. * phi1)
def PSIma(f, g): a = 0.33 b = 0.41 pi = 3.141592654 tangens = scalar(atan((2.0 * g - 1.0) / sqrt(3.0))) * pi /180 tangens = ifthenelse(tangens > pi/2.0, tangens - 2.0 * pi, tangens) PSIma = ln(a + f) - 3.0 * b * f ** (1.0 / 3.0) + b * a ** (1.0 / 3.0) / 2.0 * ln((1 + g) ** 2.0 / (1.0 - g + sqrt(g))) + sqrt(3.0) * b * a ** (1.0 / 3.0) * tangens return PSIma
def maxed_func(phi1, neg=True):
ap_bin1, ap_bin2 = apriori / sum(apriori)
c = y_intercept + 1 * sigma_rr * y_step # upperline
denom = (0.5 * phi1 + c)
phi2 = (c - 0.5 * phi1)
entr = 1 / denom * (phi1 * (ln(phi1 / denom) - ln(ap_bin1)) + phi2 *
(ln(phi2 / denom) - ln(ap_bin2)))
return (entr if not neg else -entr)
def log (a, b): try: try: return div(ln(a), ln(b)) except AttributeError: return div(math.log(a), math.log(b)) except ValueError: return nan
def pascal(k, p):
tr = 1
qr = ln(1 - p)
for _ in range(k):
r = random()
tr = tr * r
x = floor(ln(tr) / qr)
return x
def calculate_democrat_and_republican_probability(probabilities, row_features):
democrat_probability = 0
republican_probability = 0
for h in range(1, 17):
democrat_probability += ln(probabilities['democrat_col' + str(h) +
'_' + row_features[h - 1]])
republican_probability += ln(probabilities['republican_col' + str(h) +
'_' + row_features[h - 1]])
return democrat_probability, republican_probability
def aleatoria_normal_muller(cant_numeros, media, desviacion):
numeros = []
for i in range(round(cant_numeros/2)):
n1 = (pow((-2*ln(random.uniform(0,1))),0.5)*math.cos(2*math.pi*random.uniform(0,1)))*desviacion + media
n2 = (pow((-2*ln(random.uniform(0,1))),0.5)*math.sin(2*math.pi*random.uniform(0,1)))*desviacion + media
numeros.append(n1)
numeros.append(n2)
return numeros[:cant_numeros]
def area_scheme_3(x1, x2, y1, y2):
"""
0<=x1<=x2
"""
dx, dy = x2 - x1, y2 - y1
dlnx = ln(x2) - ln(x1)
# m = dy/dlnx
return y1 * dx + dy * x2 - dy * np.nan_to_num(
dx / dlnx, nan=x1, posinf=x1, neginf=x1)
def cross_entropy_loss(*args):
#args[0] is the expected value
#args[1] is the value received
#args[2] False: calculate error. True: calculate derivative of error
t = args[0]
y = args[1]
if not args[2]:
return t * np.ln(y) + (1 - t) * np.ln(1 - y)
elif args[2]:
return y - t
def Gb(Hb, Wb, LG):
X = min(Hb, Wb)
Y = max(Hb, Wb)
A = 0.5 * (X / Y) * (4 / math.pi - X / Y)
B = ln(1 + (Y**2) / (X**2))
C = ln(X / 2)
rb = math.exp(A * B + C)
Ub = LG / rb
Gb = ln(Ub + (Ub**2 - 1)**0.5)
return Gb
def T4_flat_side(rt_s, L, s1, De):
### rt_s : Soil resistivity
### L : distance from cable centre to groud surface (mm)
### s1 : separation of two cable (mm)
### De : Cable external OD
u = 2 * L / De
A = ln(u + (u**2 - 1)**0.5)
B = 0.5 * ln(1 + (2 * L / s1)**2)
T4_side = (rt_s / (2 * math.pi)) * (A + B)
return T4_side
def wish_dist(Wi, Wj, k):
"""function to find the Wishart between two covariance matrice
Returns distance
Parameters
----------
Wi,Wj : comaplex amtrix
covariance matrices
k : int
distance definition type to be used for calculation.
Returns
-------
data : float
distance
"""
# sum of covariance matrices
Wij = Wi + Wj
# log of determinant probably
log_j = np.ln(
Wj(1, 1) * Wj(2, 2) * Wj(3, 3) * (1 - (np.real(Wj(1, 3)) ^ 2)))
# this is actually: log(det(Wj)) >>Using analytically reduced form (Rignot and Chellappa, 1992)
log_i = np.ln(
Wi(1, 1) * Wi(2, 2) * Wi(3, 3) * (1 - (np.real(Wi(1, 3)) ^ 2)))
# this is actually: Log(Wi) >>Using analytically reduced form (Rignot and Chellappa, 1992)
log_ij = np.ln(
Wij(1, 1) * Wij(2, 2) * Wij(3, 3) * (1 - (np.real(Wij(1, 3)) ^ 2)))
# absolute of trace of inverse matrices
tri = np.abs(alg.trace(alg.pinv(Wj) * Wi))
trj = np.abs(alg.trace(alg.pinv(Wi) * Wj))
if k == 1:
# default Wishart distance
dist = log_j + tri
if k == 2:
# symmetric Wishart distance
dist = .5 * (log_i + log_j + tri + trj)
if k == 3:
# Bartlett distance
dist = 2 * log_ij - log_i - log_j
if k == 4:
# revised Wishart distance
dist = log_j - log_i + tri
if k == 5:
# another dstance
dist = tri + trj
return dist
def Cw(hi, L, z0, z0h): alfa = 0.12 beta = 125.0 C0 = (alfa / beta) * hi C1 = pcrumin(z0h) / L C11 = -alfa * hi / L C21 = hi / (beta * z0) C22 = -beta * z0 / L C = ifthenelse(z0 < C0, pcrumin(ln(alfa)) + PSIh_y(C11) - PSIh_y(C1), ln(C21) + PSIh_y(C22) - PSIh_y(C1)) Cw = ifthenelse(C < 0.0, 0.0, C) # This results from unfortunate parameter combination! return Cw
def calculate_air_inleakage(V, P):
"""
Return air in-leakage in kg/hr.
Parameters
----------
V : float
Vacuum volume in m3
P : float
Suction pressure in Torr
"""
return 5 + (0.0298 + 0.03088 * ln(P) - 5.733e-4 * ln(P)**2) * V**0.66
def le(L, l):
'''
Solve embedded length l_e of fibes (including null values) (integral)
'''
if L < l:
#print 'very short specimen',
return L / 4.
if L < 2. * l:
#print 'short specimen',
return -L / 4. - L / 4. * ln(L / 2.) + L / 4. * ln(L) + 1 / 2. * l * (1 - L / (2. * l)) + 1 / 4. * L * ln(L / (2. * l)) + l / 4.
if L >= 2. * l:
#print 'long specimen',
return -1 / 4. * l - 1 / 4. * L * ln(L - l) + 1 / 4. * L * ln(L)
def prob( lc, lf, delta ):
#type I and III
if ( lf <= lc / 2. - delta ) and ( lf <= lc / 2. + delta ):
print "Varianta I or III ",
return lc / lf * ( ln( lc / ( lc - lf ) ) ) - 1
#type II
if ( lf < lc / 2. + delta ) and ( lf > lc / 2. - delta ):
print "Varianta II ",
return 1 / 2. / lf * ( ( lc + 2. * delta ) * ln( 2. / ( lc + 2. * delta ) ) - ( ln( lc - lf ) + 1 ) * ( lc - 2. * delta ) + 2. * lc * ln( lc ) )
#type IV
if ( lf >= lc / 2. + delta ) and ( lf >= lc / 2. - delta ):
print "Varianta IV ",
return 1 + 1 / lf * ( -lc + ( lc / 2. - delta ) * ln( ( lc + 2 * delta ) / ( lc - 2 * delta ) ) + lc * ln( 2 * lc / ( lc + 2 * delta ) ) )
def u_pbl(NDVI): """Calculates Planetary Boundary Layer wind speed [m s-1] from NDVI NDVI Input PCRaster NDVI map (scalar, ratio between 0 and 1)""" z0m = 0.005 + 0.5 * (nd_mid/nd_max) ** 2.5 assert z0m >= 0.0 fc = ((nd_mid - nd_min) / nd_df) ** 2.0 # fractional vegetation cover == Wfol (-) assert fc >= 0.0 h = z0m / 0.136 # total height of vegetation (m) d = 2.0/3.0 * h # zero plane displacement (m) u_c = ln((z_pbl - d) / z0m) / ln((z_ms - d) / z0m) u_pbl = u_s * u_c return u_pbl, z0m, d, fc, h
def _get_results(self):
"""dividing the interval <a,b>,
returns aprox x, error estimation, No. of steps ..."""
int = [self.a, self.b]
if self.f(self.a) * self.f(self.b) > 0:
print "None or more than 1 roots in selected interval"
else:
while abs(int[0] - int[1])/2 > self.error:
if self.f(int[0]) * self.f((int[0] + int[1])*0.5) < 0:
int.insert(1,(int[0]+int[1])*0.5), int.pop()
else:
int.insert(1,(int[0]+int[1])*0.5), int.pop(0)
return [(int[0] + int[1])/2,
abs(int[0] - int[1])/2,
(ln(2)-ln( (abs( int[0] - int[1] ) /2)/(self.b-self.a)))/ln(2)]
def get_eps_x_reinf (self, crack_x):
self.cbs_allocation(abs(crack_x[0]))
self.weakest_cb_check()
if crack_x[0] not in self.unsorted_crack_list:
self.unsorted_crack_list.append(crack_x[0])
le_array, phi_array, f_array , tau_array = self.fiber_data_tuple[2][self.crack_list.index(abs(crack_x[0]))] , self.fiber_data_tuple[1][self.crack_list.index(abs(crack_x[0]))], self.fiber_data_tuple[3][self.crack_list.index(abs(crack_x[0]))], self.fiber_data_tuple[4][self.crack_list.index(abs(crack_x[0]))]
diff = self.sum_of_fiberforces(crack_x, le_array, phi_array , f_array, tau_array)
self.diff_list.append(diff)
index_lists = self.unsorted_crack_list.index(crack_x[0])
F = self.P - self.diff_list[index_lists]
#Ar_fibers = self.active_fibers_list[index_lists] * Pi * self.r **2
#########TESTPLOT#######################
Af = len(le_array) * Pi * self.r ** 2 * 2
plt.plot(crack_x, self.ar_list[index_lists] / Af)
lf = self.fiber_length
z = crack_x
r = self.r
testAr = 2 * Pi * r ** 2 * (-2 * z + z * ln(2 * z / lf) + lf) / lf
#testAcki = (10 * [10 - 2. * z + 2. * z * (.6931471806 + ln((1 / 10) * z))]) / (10 - 2. * z) ** 2
#plt.plot(crack_x, testAcki / (2 * Pi * r ** 2))
plt.plot(crack_x, testAr / (2 * Pi * r ** 2))
plt.plot(crack_x, Ar_alc(z, self.fiber_length))
#maxAr = np.max(self.ar_list[index_lists])
#minAr = np.min(self.ar_list[index_lists])
#x_gerade = [0, 4.5]
#y_gerade = [maxAr, minAr]
#plt.plot(x_gerade, y_gerade)
#plt.plot()
plt.show()
################################
Ar_fibers = self.ar_list[index_lists]
eps = F / self.Er / Ar_fibers
return eps * H(eps)
def significance(signal, background, min_bkg=0, highstat=True):
if isinstance(signal, (list, tuple)):
signal = sum(signal)
if isinstance(background, (list, tuple)):
background = sum(background)
sig_counts = np.array(list(signal.y()))
bkg_counts = np.array(list(background.y()))
# reverse cumsum
S = sig_counts[::-1].cumsum()[::-1]
B = bkg_counts[::-1].cumsum()[::-1]
exclude = B < min_bkg
with np.errstate(divide='ignore', invalid='ignore'):
if highstat:
# S / sqrt(S + B)
sig = np.ma.fix_invalid(np.divide(S, np.sqrt(S + B)),
fill_value=0.)
else:
# sqrt(2 * (S + B) * ln(1 + S / B) - S)
sig = np.sqrt(2 * (S + B) * np.ln(1 + S / B) - S)
bins = list(background.xedges())[:-1]
max_bin = np.argmax(np.ma.masked_array(sig, mask=exclude))
max_sig = sig[max_bin]
max_cut = bins[max_bin]
return sig, max_sig, max_cut
def calc_bethe_entropy(B):
"""Calculate the Bethe entropy given beliefs B"""
Sbethe = 0
for roti,rotj in rotedges:
try:
if B[(roti,rotj)]>0:
Sbethe -= B[(roti,rotj)]* ln(B[(roti,rotj)])
except RuntimeError:
pass # can't find edge. . .
sumqi = sum([len(res2partners[resid])-1 for resid in resids])
blogb = 0
for roti in eg.GetVertexIDs():
if B[roti]>0:
blogb += B[roti]* ln(B[roti])
Sbethe += sumqi*blogb
return Sbethe
def Bw(hi, L, z0): # constants (Brutsaert, 1999) alfa = 0.12 beta = 125.0 # calculations B0 = (alfa / beta) * hi B1 = -1.0 *z0 / L B11 = -alfa * hi / L B21 = hi / (beta * z0) B22 = -beta * z0 / L tempB11 = PSIm_y(B11) tempB1 = PSIm_y(B1) B = ifthenelse(z0 < B0, -1.0 * ln(alfa) + PSIm_y(B11) - PSIm_y(B1), ln(B21) + PSIm_y(B22) - PSIm_y(B1)) Bw = ifthenelse(B < 0.0, 0.0, B) # This results from unfortunate parameter combination! return Bw
def calc_meanfield_entropy(B):
"""Calculate the mean-field entropy given beliefs B"""
Smeanfield = 0
for roti in eg.GetVertexIDs():
if B[roti]>0:
Smeanfield -= B[roti] * ln(B[roti])
return Smeanfield
def FKB_1(u_zref, zref, h, LAI, Wfol, Ta, pa):
"""Initial determination of roughness length for heat transfer (non-spatial)
KB-1 function according to Massman, 1999
Convention of variable names:
f_z = f(z)
d2h = d/h
u_zref Input wind speed at reference height [m s-1]
zref Input reference height [m]
h Input canopy height [m]
LAI Input canopy total Leaf Area Index [-]
Wfol Input Fractional canopy cover [-]
Ta Input ambient temperature [degrees Celsius]
pa Input ambient air pressure [Pa]"""
# Constants
C_d = 0.2 # foliage drag coefficient
C_t = 0.01 # heat transfer coefficient
k = 0.41 # Von Karman constant
Pr = 0.7 # Prandtl number
hs = 0.009 # height of soil roughness obstacles (0.009-0.024)
# Calculations
Wsoil = 1.0 - Wfol
if Wfol == 0.0: # for bare soil take soil roughness
h = hs
assert Wfol >= 0.0 and Wfol <= 1.0 and Wsoil >= 0.0 and Wsoil <= 1.0
z0 = 0.136 * h # Brutsaert (1982)
u_h0 = u_zref * ln(2.446) / ln ((zref - 0.667 * h) / z0) # wind speed at canopy height
u_h0 = cellvalue(u_h0, 0, 0)
u_h0 = u_h0[0]
assert u_h0 >= 0.0
ust2u_h = 0.32 - 0.264/exp(15.1 * C_d * LAI)
ustarh = ust2u_h * u_h0
nu0 = 1.327E-5 * (101325.0 / pa) * (Ta / 273.15 + 1.0) ** 1.81 # kinematic viscosity
n_h = C_d * LAI / (2.0 * ust2u_h ** 2.0)
# First term
if n_h <> 0.0:
F1st = k * C_d / (4.0 * C_t * ust2u_h * (1.0 - exp(pcrumin(n_h)/2.0))) * Wfol ** 2.0
else:
F1st = 0.0
# Second term
S2nd = k * ust2u_h * 0.136 * Pr ** (2.0/3.0) * sqrt(ustarh * h / nu0) * Wfol ** 2.0 * Wsoil ** 2.0
# Third term
T3rd = (2.46 * (u_zref * k / ln(zref/hs) * hs / nu0) ** 0.25 - ln(7.4)) * Wsoil ** 2.0
return F1st + S2nd + T3rd
def mean_approx(self,l):
yarn = self._get_gbundle_props()
# bundle length
l_b = yarn[0]
# mean and stdev of Gaussian bundle
mu_b = yarn[1]
gamma_b = yarn[2]
# No. of bundles in series
nb = l/l_b
if nb == 1:
return mu_b, mu_b, mu_b
w = ln(nb)
# approximation of the mean for k = (1;300) (Mirek)
mu = mu_b + gamma_b * (-0.007 * w**3 + 0.1025 * w**2 - 0.8684 * w)
### approximation for the mean from extremes of Gaussian (tends to Gumbel as mb grows large)
a = gamma_b / sqrt(2*w)
b = mu_b + gamma_b * ( (ln(w) + ln(4*pi))/ sqrt(8 * w) - sqrt(2 * w))
med = b + a * ln(ln(2))
mean = b - 0.5772156649015328606 * a
return mu, mean, med
def PSIh_y(Y): # Integrated stability correction function for heat # Inputs # Y = -z/L, z is the height, L the Obukhov length # constants (Brutsaert, 1999) c = 0.33 d = 0.057 n = 0.78 # Calculation Y = abs(Y) PSIh_y = (1.0 - d) / n * ln((c + Y ** n) / c) return PSIh_y
def calc_bethe_avg_E(B):
"""Calculate the Bethe average energy given beliefs B"""
Ubethe = 0
for xi,xj in rotedges:
try:
Ubethe -= B[(xi,xj)] * ln(psi[xi,xj])
except RuntimeError:
pass # can't find edge. . .
for xi in phi.keys():
#Ubethe -= B[xi]* ln(phi[xi])
Ubethe -= B[xi] * eg.GetVertexEnergy(xi)
return Ubethe
def inverse_boltzmann(P_q,kT=4.1e-21):
"""
returns the inverse boltzman; given a probability of being at a given
extension
Args:
P_q: the probability at each extension
kT: boltzmann's constant
Returns:
G_eqm(q), from Gupta, A. N. et al, Nat Phys 7, 631-634, 2011.
"""
return -kT * np.ln(probability_of_extension)
def __init__(self, sigma, P0, Pth):
"""
Make a Gaussian pump with maximum power P0 * Pth, where Pth is the
threshold value of P in the normalised GPE.
Parameters:
sigma: value of sigma for the Gaussian. Should be in SI units
P0: Maximum pump power. In units of Pth.
Pth: The value of the threshold power in the scaled GPE.
"""
self.charSize = 2.0 * np.sqrt(2 * np.ln(2)) * sigma
self.function = lambda x, y: (P0 * Pth *
np.exp(-0.5 * (x**2 + y**2) / sigma**2))
def gaussian_kernel(hpbw, dim=2):
import numpy
from numpy import log as ln
from numpy import sqrt
sigma = hpbw / 2. / sqrt(2 * ln(2))
sigma2 = 2 * sigma**2.
s = int(hpbw/2. * 3 + 1)
if dim == 1:
x = numpy.mgrid[-s:s+1]
g = numpy.exp(-(x ** 2 / sigma2))
elif dim == 2:
x, y = numpy.mgrid[-s:s+1, -s:s+1]
g = numpy.exp(-(x ** 2 / sigma2 + y ** 2 / sigma2))
else:
return None
return numpy.array(g/g.sum(), dtype=numpy.float32)
def model_eps(q,rs,ThomasFermi=True):
kF = 3.63/(rs) # in A^-1, for a free electron gas
k0 = 0.815*kF*(rs)**0.5 # this is from AM
q = q*kF # parser script is giving things in terms of q/kF
if ( ThomasFermi == True):
Fq = 1.0
else:
beta = q/(2*kF)
Fq = (1.0/(8.0*beta))*(4*beta + 2*(1 - beta**2)*ln(abs((1 + beta)/(1 - beta))))
eps = (1 + (k0**2.0)/(q**2.0)*Fq)
return eps
def PSIm_y(Y): # Integrated stability correction function for momentum # Inputs # Y = -z/L, where z is the height, L the Obukhov length # test values # Constants (Brutsaert, 1999) a = 0.33 b = 0.41 m = 1.0 pi= 3.141592654 # Calculation #//HK 040902 Y = abs(Y) #abs(Y) x = (Y/a) ** (1.0/3.0) PSI0 = pcrumin(ln(a)) + sqrt(3.0) * b * a ** (1.0 / 3.0) * pi / 6.0 b_3 = b ** -3.0 PSIm_y = ifthenelse(Y <= b_3, PSIma(Y, x) + PSI0, PSIma(b_3, ((b_3/a)**(1.0/3.0))) + PSI0) #PSIm_y = ifthenelse(Y <= b_3, PSIma(Y, x) + PSI0, (1.0 / (PSIma(b_3, ((b_3/a)**(1.0/3.0))))) + PSI0) return PSIm_y
def tex(hdu, tau, freq=None, Tbg=None):
tau, tau_str = get_quantity(tau, '')
T = get_quantity(hdu.data, get_bunit(hdu))[0]
freq = get_freq(hdu, freq)
Tbg = get_Tbg(Tbg)
logger.info('(tex) tau={tau_str}, freq={freq}, Tbg={Tbg}'.format(**locals()))
logger.info('(tex) start calculation')
hvk = h * freq / k_B
A = T / hvk / (-1 * expm1(-tau))
B = 1 / expm1(hvk / Tbg)
tex = hvk * (ln(1 + (A + B)**-1))**-1
logger.debug('(tex) hv/k : {0:.3e}'.format(hvk.to('Hz K s')))
logger.debug('(tex) hv/k/expm1(hv/kTbg) : {0:.3e}'.format(B * hvk.to('Hz K s')))
logger.info('(tex) done')
new_header = hdu.header.copy()
new_header['BUNIT'] = 'K'
new_hdu = astropy.io.fits.PrimaryHDU(tex.to('K').value, new_header)
return new_hdu
def tau(hdu, Tex, freq=None, Tbg=None):
tex, tex_str = get_quantity(Tex, 'K')
T = get_quantity(hdu.data, get_bunit(hdu))[0]
freq = get_freq(hdu, freq)
Tbg = get_Tbg(Tbg)
logger.info('(tau) Tex={tex_str}, freq={freq}, Tbg={Tbg}'.format(**locals()))
logger.info('(tau) start calculation')
hvk = h * freq / k_B
A = 1 / expm1(hvk / tex)
B = 1 / expm1(hvk / Tbg)
tau = -ln(1 - T/hvk * (A - B)**-1)
logger.debug('(tau) hv/k : {0:.3e}'.format(hvk))
logger.debug('(tau) 1/expm1(hv/kTbg) : {0:.3e}'.format(B))
logger.info('(tau) done')
new_header = hdu.header.copy()
new_header['BUNIT'] = ''
new_hdu = astropy.io.fits.PrimaryHDU(tau.to('').value, new_header)
return new_hdu
for j in range( 0, n_spec ):
cosO = rand( 1, n ) # technicky vzato ma byt 1 - rand()
lx = lf * cosO # n...cisel
volna = lf - lx
sx = rand( 1, n ) * volna + lf / 2. * cosO
vec_cut += cut_func( sx, lx, sec )
v.append( sum( vec_cut ) )
print v
#for k in range (0,len(volno[0])):
# print volno[0][k]
N = n_spec * n
p = ( 1. / 2. - delta / lf ) * ln( ( lf + 2. * delta ) / ( lf - 2. * delta ) ) + ln( 2. * lf / ( lf + 2. * delta ) )
print p
rv = binom( N, p )
x = linspace( 0, N, N + 1 )
plot( x, nsim * rv.pmf( x ) )
# plot histogram
pdf, bins, patches = hist( v, N, normed=0 ) #, facecolor='green', alpha=1
#print pdf/float(nsim)
#plot( bins[:-1], pdf/float(nsim), 'rx' ) # centroids
#print sum( pdf * diff( bins ) )
show()