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

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Arash Partow
2020-01-01 00:00:00 +00:00
parent f32d2b4bbb
commit e67b22afd9
25 changed files with 3701 additions and 1792 deletions
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24
exprtk_simple_example_02.cpp
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@ -3,7 +3,7 @@
* C++ Mathematical Expression Toolkit Library *
* *
* Simple Example 2 *
* Author: Arash Partow (1999-2018) *
* Author: Arash Partow (1999-2020) *
* URL: http://www.partow.net/programming/exprtk/index.html *
* *
* Copyright notice: *
@ -18,6 +18,7 @@
#include <cstdio>
#include <string>
#include "exprtk.hpp"
@ -28,14 +29,15 @@ void square_wave()
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)+"
" (1 /9)*sin(18*pi*f*t)+(1/11)*sin(22*pi*f*t)+"
" (1/13)*sin(26*pi*f*t)+(1/15)*sin(30*pi*f*t)+"
" (1/17)*sin(34*pi*f*t)+(1/19)*sin(38*pi*f*t)+"
" (1/21)*sin(42*pi*f*t)+(1/23)*sin(46*pi*f*t)+"
" (1/25)*sin(50*pi*f*t)+(1/27)*sin(54*pi*f*t))";
const 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)+"
" (1 /9)*sin(18*pi*f*t)+(1/11)*sin(22*pi*f*t)+"
" (1/13)*sin(26*pi*f*t)+(1/15)*sin(30*pi*f*t)+"
" (1/17)*sin(34*pi*f*t)+(1/19)*sin(38*pi*f*t)+"
" (1/21)*sin(42*pi*f*t)+(1/23)*sin(46*pi*f*t)+"
" (1/25)*sin(50*pi*f*t)+(1/27)*sin(54*pi*f*t))";
static const T pi = T(3.141592653589793238462643383279502);
@ -59,8 +61,8 @@ void square_wave()
for (t = (T(-2) * pi); t <= (T(+2) * pi); t += delta)
{
T result = expression.value();
printf("%19.15f\t%19.15f\n",t,result);
const T result = expression.value();
printf("%19.15f\t%19.15f\n", t, result);
}
}