Source code for ufl.referencevalue

"""Representation of the reference value of a function."""
# Copyright (C) 2008-2016 Martin Sandve Aln├Žs
#
# This file is part of UFL (https://www.fenicsproject.org)
#
# SPDX-License-Identifier:    LGPL-3.0-or-later

from ufl.core.operator import Operator
from ufl.core.terminal import FormArgument
from ufl.core.ufl_type import ufl_type


[docs]@ufl_type(num_ops=1, is_index_free=True, is_terminal_modifier=True, is_in_reference_frame=True) class ReferenceValue(Operator): """Representation of the reference cell value of a form argument.""" __slots__ = () def __init__(self, f): """Initialise.""" if not isinstance(f, FormArgument): raise ValueError("Can only take reference value of form arguments.") Operator.__init__(self, (f,)) @property def ufl_shape(self): """Get the UFL shape.""" return self.ufl_operands[0].ufl_element().reference_value_shape
[docs] def evaluate(self, x, mapping, component, index_values, derivatives=()): """Get child from mapping and return the component asked for.""" raise NotImplementedError()
def __str__(self): """Format as a string.""" return f"reference_value({self.ufl_operands[0]})"