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ift
NIFTy
Commits
9840890e
Commit
9840890e
authored
Mar 12, 2019
by
Martin Reinecke
Browse files
Merge remotetracking branch 'origin/NIFTy_5' into documentation_feedback
parents
67a2d129
9f8bd423
Pipeline
#45147
passed with stages
in 9 minutes and 25 seconds
Changes
1
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1
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Inline
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nifty5/operators/scaling_operator.py
View file @
9840890e
...
...
@@ 35,6 +35,19 @@ class ScalingOperator(EndomorphicOperator):

:class:`Operator` supports the multiplication with a scalar. So one does
not need instantiate :class:`ScalingOperator` explicitly in most cases.
Formally, this operator always supports all operation modes (times,
adjoint_times, inverse_times and inverse_adjoint_times), even if `factor`
is 0 or infinity. It is the user's responsibility to apply the operator
only in appropriate ways (e.g. call inverse_times only if `factor` is
nonzero).
Along with this behaviour comes the feature that it is possible to draw an
inverse sample from a :class:`ScalingOperator` (which is a zerofield).
This occurs if one draws an inverse sample of a positive definite sum of
two operators each of which are only positive semidefinite. However, it
is unclear whether this beviour does not lead to unwanted effects
somewhere else.
"""
def
__init__
(
self
,
factor
,
domain
):
...
...
@@ 44,9 +57,6 @@ class ScalingOperator(EndomorphicOperator):
raise
TypeError
(
"Scalar required"
)
self
.
_factor
=
factor
self
.
_domain
=
makeDomain
(
domain
)
if
self
.
_factor
==
0.
:
self
.
_capability
=
self
.
TIMES

self
.
ADJOINT_TIMES
else
:
self
.
_capability
=
self
.
_all_ops
def
apply
(
self
,
x
,
mode
):
...
...
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