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

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Arash Partow
2015-03-28 23:21:55 +11:00
parent 73b1e4c9f3
commit 53b2977902
8 changed files with 3861 additions and 2838 deletions
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10
exprtk_simple_example_02.cpp
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@ -24,6 +24,10 @@
template <typename T>
void square_wave()
{
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
std::string expr_string = "a*(4/pi)*"
"((1 /1)*sin( 2*pi*f*t)+(1 /3)*sin( 6*pi*f*t)+"
" (1 /5)*sin(10*pi*f*t)+(1 /7)*sin(14*pi*f*t)+"
@ -39,16 +43,16 @@ void square_wave()
T t = T(0);
T a = T(10);
exprtk::symbol_table<T> symbol_table;
symbol_table_t symbol_table;
symbol_table.add_variable("f",f);
symbol_table.add_variable("t",t);
symbol_table.add_variable("a",a);
symbol_table.add_constants();
exprtk::expression<T> expression;
expression_t expression;
expression.register_symbol_table(symbol_table);
exprtk::parser<T> parser;
parser_t parser;
parser.compile(expr_string,expression);
const T delta = (T(4) * pi) / T(1000);