def read_cutsky_power_poles(filename, skiprows=31, **kwargs):
"""
Return a list of `Power1dDataSet` objects for each multipole in
the input data file
"""
data = np.loadtxt(filename, skiprows=skiprows, comments=None)
# make the edges
dk = 0.005
lower = data[:,0]-dk/2.
upper = data[:,0]+dk/2.
edges = np.array(list(zip(lower, upper)))
edges = np.concatenate([edges.ravel()[::2], [edges[-1,-1]]])
toret = []
columns = ['k', 'mono', 'quad', 'hexadec', 'modes']
meta = {'edges':edges}
d = data[:,[1, 2, 3, 4, -1]]
return Power1dDataSet.from_nbkit(d, meta, columns=columns, **kwargs)
def load_power(filename, mode, usecols=[], mapcols={}, **kwargs):
"""
Load a 1D or 2D power measurement and return a `DataSet`
"""
if mode not in ['1d', '2d']:
raise ValueError("`mode` must be on of '1d' or '2d'")
if mode == '1d':
toret = Power1dDataSet.from_nbkit(*files.Read1DPlainText(filename), **kwargs)
else:
toret = Power2dDataSet.from_nbkit(*files.Read2DPlainText(filename), **kwargs)
# rename any variables
if len(mapcols):
for old_name in mapcols:
toret.rename_variable(old_name, mapcols[old_name])
# only return certain variables
if len(usecols):
toret = toret[usecols]
return toret
def load_momentum(filename, ell, ell_prime, **kwargs):
"""
Return a list of mu powers as measured from momentum correlators
"""
allowed = [(0, 0), (1, 1), (2, 2), (0, 1), (0, 2), (0, 3), (1, 2), (1, 3), (0, 4)]
moments = (ell, ell_prime)
if moments not in allowed:
raise ValueError("(ell, ell_prime) must be one of %s" %str(allowed))
# load the multipoles
poles = Power1dDataSet.from_nbkit(*files.Read1DPlainText(filename), **kwargs)
k = poles['k']
power = []
# P00
if moments == (0, 0):
P_mu0 = poles['power']
power += [P_mu0, np.nan, np.nan, np.nan, np.nan]
# P01
elif moments == (0, 1):
P_mu2 = k * poles['power_1.imag']
power += [np.nan, P_mu2, np.nan, np.nan, np.nan]
# P11 or P02
elif moments == (1, 1) or moments == (0, 2):
P0 = poles['power_0.real']
P2 = poles['power_2.real']
P_mu2 = k**2 * (P0 - 0.5 * P2)
P_mu4 = k**2 * 1.5 * P2
power += [np.nan, P_mu2, P_mu4, np.nan, np.nan]
# P12 or P03
elif moments == (1, 2) or moments == (0, 3):
P1 = poles['power_1.imag']
P3 = poles['power_3.imag']
P_mu4 = k**3 * (P1 - 1.5 * P3)
P_mu6 = k**3 * 5./2 * P3
power += [np.nan, np.nan, P_mu4, P_mu6, np.nan]
# P22 or P13 or P04
else:
P0 = poles['power_0.real']
P2 = poles['power_2.real']
P4 = poles['power_4.real']
P_mu4 = k**4 * (P0 - 0.5*P2 + 3./8*P4)
P_mu6 = k**4 * (1.5*P2 - 15./4*P4)
P_mu8 = k**4 * 35./8 * P4
power += [np.nan, np.nan, P_mu4, P_mu6, P_mu8]
usecols = ['k', 'modes']
new_poles = []
for P in power:
if np.isscalar(P) and np.isnan(P):
new_poles.append(np.nan)
else:
copy = poles.copy()
copy = copy[usecols]
copy['power'] = P
new_poles.append(copy)
return new_poles
