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

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ArashPartow
2024-01-01 00:00:00 +00:00
committed by Arash Partow
parent f46bffcd69
commit cc1b800c2b
33 changed files with 67415 additions and 54230 deletions
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25
exprtk_simple_example_02.cpp
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@ -2,8 +2,8 @@
**************************************************************
* C++ Mathematical Expression Toolkit Library *
* *
* Simple Example 2 *
* Author: Arash Partow (1999-2023) *
* Simple Example 02 *
* Author: Arash Partow (1999-2024) *
* URL: https://www.partow.net/programming/exprtk/index.html *
* *
* Copyright notice: *
@ -11,6 +11,7 @@
* permitted under the guidelines and in accordance with the *
* most current version of the MIT License. *
* https://www.opensource.org/licenses/MIT *
* SPDX-License-Identifier: MIT *
* *
**************************************************************
*/
@ -29,15 +30,15 @@ void square_wave()
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_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))";
const std::string expression_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);
@ -55,7 +56,7 @@ void square_wave()
expression.register_symbol_table(symbol_table);
parser_t parser;
parser.compile(expr_string,expression);
parser.compile(expression_string,expression);
const T delta = (T(4) * pi) / T(1000);