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Commit 4a64eb39 authored by Theo Steininger's avatar Theo Steininger
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Changed convention from `sqrt(power_spectrum)` to `power_spectrum`.

parent ccacfc73
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nifty/field.py
View file @ 4a64eb39
......@@ -283,7 +283,6 @@ class Field(Loggable, Versionable, object):
spaces : int *optional*
The subspace for which the powerspectrum shall be computed
(default : None).
if spaces==None : Tries to synthesize for the whole domain
logarithmic : boolean *optional*
True if the output PowerSpace should use logarithmic binning.
{default : False}
......@@ -336,23 +335,31 @@ class Field(Loggable, Versionable, object):
# check if the `spaces` input is valid
spaces = utilities.cast_axis_to_tuple(spaces, len(self.domain))
if spaces is None:
if len(self.domain) == 1:
spaces = (0,)
else:
raise ValueError(
"Field has multiple spaces as domain "
"but `spaces` is None.")
spaces = range(len(self.domain))
if len(spaces) == 0:
raise ValueError(
"No space for analysis specified.")
elif len(spaces) > 1:
raise ValueError(
"Conversion of only one space at a time is allowed.")
space_index = spaces[0]
work_field = abs(self)
work_field = work_field*work_field
for space_index in spaces:
work_field = self._single_power_analyze(
work_field=work_field,
space_index=space_index,
logarithmic=logarithmic,
nbin=nbin,
binbounds=binbounds,
keep_phase_information=keep_phase_information)
return work_field
@classmethod
def _single_power_analyze(cls, work_field, space_index, logarithmic, nbin,
binbounds, keep_phase_information):
if not self.domain[space_index].harmonic:
if not work_field.domain[space_index].harmonic:
raise ValueError(
"The analyzed space must be harmonic.")
......@@ -363,10 +370,10 @@ class Field(Loggable, Versionable, object):
# If it was complex, all the power is put into a real power spectrum.
distribution_strategy = \
self.val.get_axes_local_distribution_strategy(
self.domain_axes[space_index])
work_field.val.get_axes_local_distribution_strategy(
work_field.domain_axes[space_index])
harmonic_domain = self.domain[space_index]
harmonic_domain = work_field.domain[space_index]
power_domain = PowerSpace(harmonic_partner=harmonic_domain,
distribution_strategy=distribution_strategy,
logarithmic=logarithmic, nbin=nbin,
......@@ -379,32 +386,32 @@ class Field(Loggable, Versionable, object):
if keep_phase_information:
hermitian_part, anti_hermitian_part = \
harmonic_domain.hermitian_decomposition(
self.val,
axes=self.domain_axes[space_index])
work_field.val,
axes=work_field.domain_axes[space_index])
[hermitian_power, anti_hermitian_power] = \
[self._calculate_power_spectrum(
x=part,
pindex=pindex,
rho=rho,
axes=self.domain_axes[space_index])
[cls._calculate_power_spectrum(
field_val=part,
pindex=pindex,
rho=rho,
axes=work_field.domain_axes[space_index])
for part in [hermitian_part, anti_hermitian_part]]
power_spectrum = hermitian_power + 1j * anti_hermitian_power
else:
power_spectrum = self._calculate_power_spectrum(
x=self.val,
pindex=pindex,
rho=rho,
axes=self.domain_axes[space_index])
power_spectrum = cls._calculate_power_spectrum(
field_val=work_field.val,
pindex=pindex,
rho=rho,
axes=work_field.domain_axes[space_index])
# create the result field and put power_spectrum into it
result_domain = list(self.domain)
result_domain = list(work_field.domain)
result_domain[space_index] = power_domain
result_dtype = power_spectrum.dtype
result_field = self.copy_empty(
result_field = work_field.copy_empty(
domain=result_domain,
dtype=result_dtype,
distribution_strategy=power_spectrum.distribution_strategy)
......@@ -412,17 +419,16 @@ class Field(Loggable, Versionable, object):
return result_field
def _calculate_power_spectrum(self, x, pindex, rho, axes=None):
fieldabs = abs(x)
fieldabs **= 2
@classmethod
def _calculate_power_spectrum(cls, field_val, pindex, rho, axes=None):
if axes is not None:
pindex = self._shape_up_pindex(
pindex=pindex,
target_shape=x.shape,
target_strategy=x.distribution_strategy,
axes=axes)
power_spectrum = pindex.bincount(weights=fieldabs,
pindex = cls._shape_up_pindex(
pindex=pindex,
target_shape=field_val.shape,
target_strategy=field_val.distribution_strategy,
axes=axes)
power_spectrum = pindex.bincount(weights=field_val,
axis=axes)
if axes is not None:
new_rho_shape = [1, ] * len(power_spectrum.shape)
......@@ -430,10 +436,10 @@ class Field(Loggable, Versionable, object):
rho = rho.reshape(new_rho_shape)
power_spectrum /= rho
power_spectrum **= 0.5
return power_spectrum
def _shape_up_pindex(self, pindex, target_shape, target_strategy, axes):
@staticmethod
def _shape_up_pindex(pindex, target_shape, target_strategy, axes):
if pindex.distribution_strategy not in \
DISTRIBUTION_STRATEGIES['global']:
raise ValueError("pindex's distribution strategy must be "
......@@ -548,6 +554,8 @@ class Field(Loggable, Versionable, object):
# components
spec = self.val.get_full_data()
spec = np.sqrt(spec)
for power_space_index in spaces:
spec = self._spec_to_rescaler(spec, result_list, power_space_index)
local_rescaler = spec
......@@ -1147,8 +1155,8 @@ class Field(Loggable, Versionable, object):
"""
return_field = self.copy_empty()
new_val = abs(self.get_val(copy=False))
return_field = self.copy_empty(dtype=new_val.dtype)
return_field.set_val(new_val, copy=False)
return return_field
......
nifty/sugar.py
View file @ 4a64eb39
......@@ -32,7 +32,7 @@ def create_power_operator(domain, power_spectrum, dtype=None,
Parameters
----------
domain : DomainObject
Domain over which the power operator shall live.
Domain over which the power operator shall live.
power_spectrum : (array-like, method)
An array-like object, or a method that implements the square root
of a power spectrum as a function of k.
......@@ -54,7 +54,6 @@ def create_power_operator(domain, power_spectrum, dtype=None,
distribution_strategy=distribution_strategy)
fp = Field(power_domain, val=power_spectrum, dtype=dtype,
distribution_strategy=distribution_strategy)
fp **= 2
f = fp.power_synthesize(mean=1, std=0, real_signal=False)
return DiagonalOperator(domain, diagonal=f, bare=True)
test/test_spaces/test_power_space.py
View file @ 4a64eb39
......@@ -32,20 +32,20 @@ from itertools import product, chain
from d2o.config import dependency_injector as gdi
HARMONIC_SPACES = [RGSpace((8,), harmonic=True),
RGSpace((7,), harmonic=True,zerocenter=True),
RGSpace((8,), harmonic=True,zerocenter=True),
RGSpace((7,8), harmonic=True),
RGSpace((7,), harmonic=True,zerocenter=True),
RGSpace((8,), harmonic=True,zerocenter=True),
RGSpace((7,8), harmonic=True),
RGSpace((7,8), harmonic=True, zerocenter=True),
RGSpace((6,6), harmonic=True, zerocenter=True),
RGSpace((7,5), harmonic=True, zerocenter=True),
RGSpace((5,5), harmonic=True),
RGSpace((5,5), harmonic=True),
RGSpace((4,5,7), harmonic=True),
RGSpace((4,5,7), harmonic=True, zerocenter=True),
LMSpace(6),
LMSpace(9)]
#Try all sensible kinds of combinations of spaces, distributuion strategy and
#Try all sensible kinds of combinations of spaces, distributuion strategy and
#binning parameters
_maybe_fftw = ["fftw"] if ('pyfftw' in gdi) else []
......@@ -138,13 +138,13 @@ class PowerSpaceConsistencyCheck(unittest.TestCase):
binbounds=binbounds)
assert_equal(p.pindex.flatten()[p.pundex],np.arange(p.dim),
err_msg='pundex is not right-inverse of pindex!')
@expand(CONSISTENCY_CONFIGS)
def test_rhopindexConsistency(self, harmonic_partner, distribution_strategy,
binbounds, nbin,logarithmic):
assert_equal(p.pindex.flatten().bincount(), p.rho,
err_msg='rho is not equal to pindex degeneracy')
class PowerSpaceFunctionalityTest(unittest.TestCase):
@expand(CONSISTENCY_CONFIGS)
def test_constructor(self, harmonic_partner, distribution_strategy,
......
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