Commit 953b54cb authored by Martin Reinecke's avatar Martin Reinecke
Browse files

add FieldZeroPadder

parent aa8fc0a6
......@@ -33,6 +33,7 @@ from .operators.endomorphic_operator import EndomorphicOperator
from .operators.exp_transform import ExpTransform
from .operators.fft_operator import FFTOperator
from .operators.fft_smoothing_operator import FFTSmoothingOperator
from .operators.field_zero_padder import FieldZeroPadder
from .operators.geometry_remover import GeometryRemover
from .operators.harmonic_transform_operator import HarmonicTransformOperator
from .operators.inversion_enabler import InversionEnabler
......@@ -37,9 +37,8 @@ class Constant(Model):
Since there is no model-function associated:
- Position has no influence on value.
- There is no Jacobian.
- The Jacobian is a null matrix.
# TODO Remove position
def __init__(self, position, constant):
super(Constant, self).__init__(position)
self._constant = constant
from __future__ import absolute_import, division, print_function
import numpy as np
from .. import dobj
from ..compat import *
from ..field import Field
from import RGSpace
from ..domain_tuple import DomainTuple
from .linear_operator import LinearOperator
class FieldZeroPadder(LinearOperator):
def __init__(self, target, factor, space=0):
super(FieldZeroPadder, self).__init__()
self._target = DomainTuple.make(target)
self._space = int(space)
tgt = self._target[self._space]
if not isinstance(tgt, RGSpace):
raise TypeError("RGSpace required")
if not len(tgt.shape) == 1:
raise TypeError("RGSpace must be one-dimensional")
if tgt.harmonic:
raise TypeError("RGSpace must not be harmonic")
dom = RGSpace((int(factor*tgt.shape[0]),), tgt.distances)
self._domain = list(self._target)
self._domain[self._space] = dom
self._domain = DomainTuple.make(self._domain)
def domain(self):
return self._domain
def target(self):
return self._target
def capability(self):
return self.TIMES | self.ADJOINT_TIMES
def apply(self, x, mode):
self._check_input(x, mode)
x = x.val
dax = dobj.distaxis(x)
shp_in = x.shape
shp_out = self._tgt(mode).shape
ax = self._domain.axes[self._space][0]
if dax == ax:
x = dobj.redistribute(x, nodist=(ax,))
curax = dobj.distaxis(x)
if mode == self.TIMES:
newarr = np.empty(dobj.local_shape(shp_out), dtype=x.dtype)
newarr[()] = dobj.local_data(x)[(slice(None),)*ax +
(slice(0, shp_out[ax]),)]
newarr = np.zeros(dobj.local_shape(shp_out), dtype=x.dtype)
newarr[(slice(None),)*ax +
(slice(0, shp_in[ax]),)] = dobj.local_data(x)
newarr = dobj.from_local_data(shp_out, newarr, distaxis=curax)
if dax == ax:
newarr = dobj.redistribute(newarr, dist=ax)
return Field(self._tgt(mode), val=newarr)
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