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ift
NIFTy
Commits
b3779f25
Commit
b3779f25
authored
May 22, 2017
by
Theo Steininger
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Small fixes in the wording.
parent
30f0c275
Pipeline
#12808
passed with stage
in 4 minutes and 26 seconds
Changes
2
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31 additions
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25 deletions
+31
-25
nifty/field.py
nifty/field.py
+16
-14
nifty/sugar.py
nifty/sugar.py
+15
-11
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nifty/field.py
View file @
b3779f25
...
...
@@ -270,13 +270,13 @@ class Field(Loggable, Versionable, object):
def
power_analyze
(
self
,
spaces
=
None
,
logarithmic
=
False
,
nbin
=
None
,
binbounds
=
None
,
decompose_power
=
True
):
""" Computes the square root power spectrum for a subspace of
the Field
.
""" Computes the square root power spectrum for a subspace of
`self`
.
Creates a PowerSpace for the space addressed by `spaces` with the given
binning and computes the power spectrum as a Field over this
PowerSpace. This can only be done if the subspace to be analyzed is a
harmonic space. The resulting field has the same units as the initial
field, corresponding to the square root of the power spectrum.
field, corresponding to the square root of the power spectrum.
Parameters
----------
...
...
@@ -457,16 +457,10 @@ class Field(Loggable, Versionable, object):
def
power_synthesize
(
self
,
spaces
=
None
,
real_power
=
True
,
real_signal
=
True
,
mean
=
None
,
std
=
None
):
"""Yields a sampled field with
this field squared
as its power spectrum.
"""
Yields a sampled field with
`self`**2
as its power spectrum.
This method draws a Gaussian random field in the harmonic partner domain
of this fields domains, using this field as power spectrum.
Notes
-----
For this the spaces specified by `spaces` must be a PowerSpace.
This expects this field to be the square root of a power spectrum, i.e.
to have the unit of the field to be sampled.
This method draws a Gaussian random field in the harmonic partner
domain of this fields domains, using this field as power spectrum.
Parameters
----------
...
...
@@ -495,12 +489,20 @@ class Field(Loggable, Versionable, object):
The output object. A random field created with the power spectrum
stored in the `spaces` in `self`.
Notes
-----
For this the spaces specified by `spaces` must be a PowerSpace.
This expects this field to be the square root of a power spectrum, i.e.
to have the unit of the field to be sampled.
See Also
--------
power_analyze
Raises
------
ValueError : If domain is not a PowerSpace
Raises
------
ValueError : If domain specified by `spaces` is not a PowerSpace.
"""
# check if the `spaces` input is valid
...
...
nifty/sugar.py
View file @
b3779f25
...
...
@@ -26,30 +26,34 @@ __all__ = ['create_power_operator']
def
create_power_operator
(
domain
,
power_spectrum
,
dtype
=
None
,
distribution_strategy
=
'not'
):
""" Creates a diagonal operator with a certain power spectrum.
""" Creates a diagonal operator with the given power spectrum.
Constructs a diagonal operator that lives over the specified domain, or
its harmonic domain in case it is not harmonic.
its default harmonic codomain in case it is not harmonic.
Parameters
----------
domain : DomainObject
Domain over which the power operator shall live. If this is not a
harmonic domain, it will return an operator for its harmonic domain
harmonic domain, it will return an operator for its harmonic
co
domain
instead.
power_spectrum :
{
array-like, method
}
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.
dtype : type
,
*optional*
dtype : type *optional*
dtype that the field holding the power spectrum shall use
{
default : None
}
if dtype == None:
passes this on to constructor of Field
distribution_strategy : string
,
*optional*
(
default : None
).
if dtype == None:
the dtype of `power_spectrum` will be used.
distribution_strategy : string *optional*
Distributed strategy to be used by the underlying d2o objects.
{default : 'not'}
(default : 'not')
Returns
-------
DiagonalOperator : An operator that
lives that
implements the given power
spectrum.
DiagonalOperator : An operator that implements the given power
spectrum.
"""
if
not
domain
.
harmonic
:
fft
=
FFTOperator
(
domain
)
domain
=
fft
.
target
[
0
]
...
...
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