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Expression.h
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1/*******************************************************************************
2 * Copyright (C) 2017-2023 Theodore Chang
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 ******************************************************************************/
28#ifndef EXPRESSION_H
29#define EXPRESSION_H
30
31#include <Domain/Tag.h>
32#include <exprtk/exprtk.hpp>
33
34class Expression : public Tag {
35 static std::mutex parser_mutex;
36 static exprtk::parser<double> parser;
37
38 std::string expression_text;
39
40protected:
41 Col<double> x;
42
43 exprtk::expression<double> expression;
44
45 exprtk::symbol_table<double> symbol_table;
46
47public:
48 explicit Expression(unsigned, const std::string&);
49
50 [[nodiscard]] virtual uword input_size() const;
51 [[nodiscard]] virtual uword output_size() const;
52
53 bool compile(const std::string&);
54 static string error();
55
56 Mat<double> evaluate(double);
57 virtual Mat<double> evaluate(const Col<double>&) = 0;
58
59 Mat<double> gradient(double);
60 virtual Mat<double> gradient(const Col<double>&) = 0;
61
62 void print() override;
63};
64
66public:
68
69 Mat<double> evaluate(const Col<double>&) override;
70
71 Mat<double> gradient(const Col<double>&) override;
72};
73
75 Col<double> y;
76
77public:
78 SimpleVectorExpression(unsigned, const std::string&, const std::string&);
79
80 [[nodiscard]] uword output_size() const override;
81
82 Mat<double> evaluate(const Col<double>&) override;
83
84 Mat<double> gradient(const Col<double>&) override { throw std::runtime_error("gradient is not implemented for vector expression"); }
85};
86
87#endif
88
A Expression class represents a maths expression.
Definition: Expression.h:34
Mat< double > gradient(double)
Definition: Expression.cpp:56
exprtk::expression< double > expression
Definition: Expression.h:43
bool compile(const std::string &)
Definition: Expression.cpp:45
Expression(unsigned, const std::string &)
Definition: Expression.cpp:24
static string error()
Definition: Expression.cpp:52
virtual Mat< double > gradient(const Col< double > &)=0
Mat< double > evaluate(double)
Definition: Expression.cpp:54
void print() override
Definition: Expression.cpp:58
virtual uword output_size() const
Definition: Expression.cpp:43
virtual uword input_size() const
Definition: Expression.cpp:41
Col< double > x
Definition: Expression.h:41
exprtk::symbol_table< double > symbol_table
Definition: Expression.h:45
virtual Mat< double > evaluate(const Col< double > &)=0
Definition: Expression.h:65
Mat< double > gradient(const Col< double > &) override
Definition: Expression.cpp:69
Mat< double > evaluate(const Col< double > &) override
Definition: Expression.cpp:62
Definition: Expression.h:74
uword output_size() const override
Definition: Expression.cpp:87
Mat< double > evaluate(const Col< double > &) override
Definition: Expression.cpp:89
Mat< double > gradient(const Col< double > &) override
Definition: Expression.h:84
A base Tag class.
Definition: Tag.h:38