Source code for ufl.referencevalue

# -*- coding: utf-8 -*-
"Representation of the reference value of a function."

# Copyright (C) 2008-2016 Martin Sandve Aln├Žs
# This file is part of UFL (
# SPDX-License-Identifier:    LGPL-3.0-or-later

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

[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): if not isinstance(f, FormArgument): error("Can only take reference value of form arguments.") Operator.__init__(self, (f,)) @property def ufl_shape(self): 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." error("Evaluate not implemented.")
def __str__(self): return "reference_value(%s)" % self.ufl_operands[0]