apply_data.py

# 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) 2013-2018 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.

from __future__ import absolute_import, division, print_function

from ..compat import *


def ApplyData(data, var, model_data):
    # TODO This is rather confusing. Delete that eventually.
    from ..operators.diagonal_operator import DiagonalOperator
    from ..models.constant import Constant
    from ..sugar import sqrt
    sqrt_n = DiagonalOperator(sqrt(var))
    data = Constant(model_data.position, data)
    return sqrt_n.inverse(model_data - data)