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

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Arash Partow
2013-07-28 21:35:06 +10:00
parent b369bc342c
commit 399a5f9aa3
7 changed files with 166 additions and 157 deletions
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10
exprtk_simple_example_02.cpp
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@ -33,9 +33,9 @@ void square_wave()
" (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(3.14159265358979323846);
T f = pi/10.0;
T t = T(0.0);
T a = T(10.0);
T f = pi / T(10);
T t = T(0);
T a = T(10);
exprtk::symbol_table<T> symbol_table;
symbol_table.add_variable("f",f);
@ -49,8 +49,8 @@ void square_wave()
exprtk::parser<T> parser;
parser.compile(expr_string,expression);
const T delta = (4.0*pi)/1000.0;
for (t = -2.0*pi; t <= +2.0*pi; t+=delta)
const T delta = (T(4) * pi) / T(1000);
for (t = (T(-2) * pi); t <= (T(+2) * pi); t += delta)
{
T result = expression.value();
printf("%19.15f\t%19.15f\n",t,result);