64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/*
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**************************************************************
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* C++ Mathematical Expression Toolkit Library *
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* *
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* Simple Example 6 *
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* Author: Arash Partow (1999-2014) *
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* URL: http://www.partow.net/programming/exprtk/index.html *
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* *
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* Copyright notice: *
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* Free use of the Mathematical Expression Toolkit Library is *
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* permitted under the guidelines and in accordance with the *
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* most current version of the Common Public License. *
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* http://www.opensource.org/licenses/cpl1.0.php *
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* *
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**************************************************************
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*/
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#include <cstdio>
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#include <string>
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#include "exprtk.hpp"
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template<typename T>
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void vector_function()
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{
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typedef exprtk::expression<T> expression_t;
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std::string expression_string = "z := (3sin(x) + 2log(y))";
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const std::size_t vec_size = 5;
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T x[vec_size] = { T(1.1), T(2.2), T(3.3), T(4.4), T(5.5) };
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T y[vec_size] = { T(1.1), T(2.2), T(3.3), T(4.4), T(5.5) };
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T z[vec_size] = { T(0.0), T(0.0), T(0.0), T(0.0), T(0.0) };
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T x_ = x[0];
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T y_ = y[0];
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T z_ = z[0];
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exprtk::symbol_table<T> symbol_table;
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symbol_table.add_variable("x",x_);
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symbol_table.add_variable("y",y_);
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symbol_table.add_variable("z",z_);
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expression_t expression;
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expression.register_symbol_table(symbol_table);
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exprtk::parser<T> parser;
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parser.compile(expression_string,expression);
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for (std::size_t i = 0; i < vec_size; ++i)
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{
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x_ = x[i]; y_ = y[i]; z_ = z[i];
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expression.value();
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x[i] = x_; y[i] = y_; z[i] = z_;
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}
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}
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int main()
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{
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vector_function<double>();
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return 0;
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}
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