/usr/lib/python2.7/dist-packages/ufl/indexed.py is in python-ufl 1.6.0-1.
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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 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | """This module defines the Indexed class."""
# Copyright (C) 2008-2014 Martin Sandve Alnes
#
# This file is part of UFL.
#
# UFL is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# UFL 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with UFL. If not, see <http://www.gnu.org/licenses/>.
from six.moves import zip
from ufl.log import error
from ufl.core.expr import Expr
from ufl.core.operator import Operator
from ufl.core.multiindex import Index, FixedIndex, MultiIndex, as_multi_index
from ufl.index_combination_utils import unique_sorted_indices, merge_unique_indices
from ufl.precedence import parstr
from ufl.common import EmptyDict
from ufl.core.ufl_type import ufl_type
#--- Indexed expression ---
@ufl_type(is_shaping=True, num_ops=2, is_terminal_modifier=True)
class Indexed(Operator):
__slots__ = ("ufl_free_indices", "ufl_index_dimensions",)
def __init__(self, expression, multiindex):
# Store operands
Operator.__init__(self, (expression, multiindex))
# Error checking
if not isinstance(expression, Expr):
error("Expecting Expr instance, not %s." % repr(expression))
if not isinstance(multiindex, MultiIndex):
error("Expecting MultiIndex instance, not %s." % repr(multiindex))
shape = expression.ufl_shape
# Error checking
if len(shape) != len(multiindex):
error("Invalid number of indices (%d) for tensor "\
"expression of rank %d:\n\t%r\n"\
% (len(multiindex), expression.rank(), expression))
if any(int(di) >= int(si) for si, di in zip(shape, multiindex) if isinstance(di, FixedIndex)):
error("Fixed index out of range!")
# Build tuples of free index ids and dimensions
if 1:
efi = expression.ufl_free_indices
efid = expression.ufl_index_dimensions
fi = list(zip(efi, efid))
for pos, ind in enumerate(multiindex._indices):
if isinstance(ind, Index):
fi.append((ind.count(), shape[pos]))
fi = unique_sorted_indices(sorted(fi))
if fi:
fi, fid = zip(*fi)
else:
fi, fid = (), ()
else:
mfiid = [(ind.count(), shape[pos]) for pos, ind in enumerate(multiindex._indices) if isinstance(ind, Index)]
mfi, mfid = zip(*mfiid) if mfiid else ((), ())
fi, fid = merge_unique_indices(expression.ufl_free_indices, expression.ufl_index_dimensions, mfi, mfid)
# Cache free index and dimensions
self.ufl_free_indices = fi
self.ufl_index_dimensions = fid
ufl_shape = ()
def is_cellwise_constant(self):
"Return whether this expression is spatially constant over each cell."
return self.ufl_operands[0].is_cellwise_constant()
def evaluate(self, x, mapping, component, index_values, derivatives=()):
A, ii = self.ufl_operands
component = ii.evaluate(x, mapping, None, index_values)
if derivatives:
return A.evaluate(x, mapping, component, index_values, derivatives)
else:
return A.evaluate(x, mapping, component, index_values)
def __str__(self):
return "%s[%s]" % (parstr(self.ufl_operands[0], self), self.ufl_operands[1])
def __repr__(self):
return "Indexed(%r, %r)" % self.ufl_operands
def __getitem__(self, key):
error("Attempting to index with %r, but object is already indexed: %r" % (key, self))
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