sum_operator.py 2.19 KB
Newer Older
Martin Reinecke's avatar
Martin Reinecke committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
# 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) 2013-2017 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.

from .linear_operator import LinearOperator


class SumOperator(LinearOperator):
    def __init__(self, op1, op2, neg=False):
        super(SumOperator, self).__init__()
        if op1.domain != op2.domain or op1.target != op2.target:
            raise ValueError("domain mismatch")
Martin Reinecke's avatar
Martin Reinecke committed
27
28
29
        self._capability = (op1.capability & op2.capability &
                            (self.TIMES | self.ADJOINT_TIMES))
        neg1 = op1._neg if isinstance(op1, SumOperator) else (False,)
Martin Reinecke's avatar
Martin Reinecke committed
30
        op1 = op1._ops if isinstance(op1, SumOperator) else (op1,)
Martin Reinecke's avatar
Martin Reinecke committed
31
        neg2 = op2._neg if isinstance(op2, SumOperator) else (False,)
Martin Reinecke's avatar
Martin Reinecke committed
32
        op2 = op2._ops if isinstance(op2, SumOperator) else (op2,)
Martin Reinecke's avatar
Martin Reinecke committed
33
34
35
36
        if neg:
            neg2 = tuple(not n for n in neg2)
        self._ops = op1 + op2
        self._neg = neg1 + neg2
Martin Reinecke's avatar
Martin Reinecke committed
37
38
39

    @property
    def domain(self):
Martin Reinecke's avatar
Martin Reinecke committed
40
        return self._ops[0].domain
Martin Reinecke's avatar
Martin Reinecke committed
41
42
43

    @property
    def target(self):
Martin Reinecke's avatar
Martin Reinecke committed
44
        return self._ops[0].target
Martin Reinecke's avatar
Martin Reinecke committed
45
46
47

    @property
    def capability(self):
Martin Reinecke's avatar
Martin Reinecke committed
48
        return self._capability
Martin Reinecke's avatar
Martin Reinecke committed
49
50
51

    def apply(self, x, mode):
        self._check_mode(mode)
Martin Reinecke's avatar
Martin Reinecke committed
52
53
54
55
56
57
58
59
60
        for i, op in enumerate(self._ops):
            if i == 0:
                res = -op.apply(x, mode) if self._neg[i] else op.apply(x, mode)
            else:
                if self._neg[i]:
                    res -= op.apply(x, mode)
                else:
                    res += op.apply(x, mode)
        return res