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ift
NIFTy
Commits
f156b5fe
Commit
f156b5fe
authored
Aug 14, 2018
by
Julia Stadler
Browse files
added docstring and comments
parent
e64857f6
Changes
1
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nifty5/operators/central_zero_padder.py
View file @
f156b5fe
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Copyright(C) 20132018 MaxPlanckSociety
#
# NIFTy is being developed at the MaxPlanckInstitut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.
from
__future__
import
absolute_import
,
division
,
print_function
import
numpy
as
np
...
...
@@ 15,11 +33,28 @@ from .. import dobj
# MR FIXME: for even axis lengths, we probably should split the value at the
# highest frequency.
class
CentralZeroPadder
(
LinearOperator
):
"""Operator that enlarges a fields domain by adding zeros from the middle.
Parameters

domain: Domain, tuple of Domains or DomainTuple
The domain of the data that is input by "times" and output by "adjoint_times"
new_shape: tuple
Shape of the target domain.
space: int, optional
The index of the subdomain on which the operator should act
If None, it is set to 0 if `domain` contains exactly one space.
`domain[space]` must be an RGSpace.
"""
def
__init__
(
self
,
domain
,
new_shape
,
space
=
0
):
self
.
_domain
=
DomainTuple
.
make
(
domain
)
self
.
_space
=
utilities
.
infer_space
(
self
.
_domain
,
space
)
dom
=
self
.
_domain
[
self
.
_space
]
# verify domains
if
not
isinstance
(
dom
,
RGSpace
):
raise
TypeError
(
"RGSpace required"
)
if
dom
.
harmonic
:
...
...
@@ 29,12 +64,15 @@ class CentralZeroPadder(LinearOperator):
if
any
([
a
<
b
for
a
,
b
in
zip
(
new_shape
,
dom
.
shape
)]):
raise
ValueError
(
"New shape must be larger than old shape"
)
# make target space
tgt
=
RGSpace
(
new_shape
,
dom
.
distances
)
self
.
_target
=
list
(
self
.
_domain
)
self
.
_target
[
self
.
_space
]
=
tgt
self
.
_target
=
DomainTuple
.
make
(
self
.
_target
)
self
.
_capability
=
self
.
TIMES

self
.
ADJOINT_TIMES
# define the axes along which the input filed is sliced
slicer
=
[]
axes
=
self
.
_target
.
axes
[
self
.
_space
]
for
i
in
range
(
len
(
self
.
_domain
.
shape
)):
...
...
@@ 65,10 +103,14 @@ class CentralZeroPadder(LinearOperator):
x
=
dobj
.
local_data
(
x
)
if
mode
==
self
.
TIMES
:
# slice along each axis and copy the data to an
# array of zeros which has the shape of the target domain
y
=
np
.
zeros
(
dobj
.
local_shape
(
shp_out
,
curax
),
dtype
=
x
.
dtype
)
for
i
in
self
.
slicer
:
y
[
i
]
=
x
[
i
]
else
:
# slice along each axis and copy the data to an array of zeros
# which has the shape of the input domain to remove excess zeros
y
=
np
.
empty
(
dobj
.
local_shape
(
shp_out
,
curax
),
dtype
=
x
.
dtype
)
for
i
in
self
.
slicer
:
y
[
i
]
=
x
[
i
]
...
...
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