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C++ Mathematical Expression Library (ExprTk) http://www.partow.net/programming/exprtk/index.html

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Arash Partow
2014-04-21 11:16:33 +10:00
parent afc7c074fa
commit a2d640ed78
5 changed files with 1136 additions and 238 deletions
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39
exprtk_simple_example_06.cpp
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@ -24,36 +24,33 @@
template<typename T>
void vector_function()
{
typedef exprtk::expression<T> expression_t;
std::string expression_string = "z := (3sin(x) + 2log(y))";
typedef exprtk::symbol_table<double> symbol_table_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
const std::size_t vec_size = 5;
std::string expression_string =
" for (i := 0; i < min(x[],y[],z[]); i += 1) "
" { "
" z[i] := 3sin(x[i]) + 2log(y[i]); "
" } ";
T x[vec_size] = { T(1.1), T(2.2), T(3.3), T(4.4), T(5.5) };
T y[vec_size] = { T(1.1), T(2.2), T(3.3), T(4.4), T(5.5) };
T z[vec_size] = { T(0.0), T(0.0), T(0.0), T(0.0), T(0.0) };
T x[] = { T(1.1), T(2.2), T(3.3), T(4.4), T(5.5) };
T y[] = { T(1.1), T(2.2), T(3.3), T(4.4), T(5.5) };
T z[] = { T(0.0), T(0.0), T(0.0), T(0.0), T(0.0) };
T x_ = x[0];
T y_ = y[0];
T z_ = z[0];
exprtk::symbol_table<T> symbol_table;
symbol_table.add_variable("x",x_);
symbol_table.add_variable("y",y_);
symbol_table.add_variable("z",z_);
symbol_table_t symbol_table;
symbol_table.add_vector("x",x);
symbol_table.add_vector("y",y);
symbol_table.add_vector("z",z);
expression_t expression;
expression.register_symbol_table(symbol_table);
exprtk::parser<T> parser;
parser_t parser;
parser.compile(expression_string,expression);
for (std::size_t i = 0; i < vec_size; ++i)
{
x_ = x[i]; y_ = y[i]; z_ = z[i];
expression.value();
x[i] = x_; y[i] = y_; z[i] = z_;
}
expression.value();
}
int main()