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

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Arash Partow
2014-05-28 07:10:40 +10:00
parent baa1feb6d2
commit 02d2402ca5
6 changed files with 3054 additions and 1304 deletions
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15
exprtk_simple_example_11.cpp
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@ -28,12 +28,13 @@ void square_wave2()
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
std::string expr_string = " r := 0; "
" for(i := 0; i < 1000; i += 1) "
" { "
" r += (1/(2i+1))*sin((4i+2)*pi*f*t); "
" }; "
" r *= a*(4 / pi); ";
std::string wave_program =
" r := 0; "
" for(i := 0; i < 1000; i += 1) "
" { "
" r += (1 / (2i + 1)) * sin((4i + 2) * pi * f * t); "
" }; "
" r *= a * (4 / pi); ";
static const T pi = T(3.14159265358979323846);
@ -53,7 +54,7 @@ void square_wave2()
parser_t parser;
parser.enable_unknown_symbol_resolver();
parser.compile(expr_string,expression);
parser.compile(wave_program,expression);
const T delta = (T(4) * pi) / T(1000);