exprtk/exprtk_simple_example_14.cpp at master · losttem/exprtk · GitHub

History

56 lines (45 loc) · 1.85 KB

Raw

**************************************************************

* C++ Mathematical Expression Toolkit Library *

* *

* Simple Example 14 *

* Author: Arash Partow (1999-2022) *

* URL: http://www.partow.net/programming/exprtk/index.html *

* *

* Copyright notice: *

* Free use of the Mathematical Expression Toolkit Library is *

* permitted under the guidelines and in accordance with the *

* most current version of the MIT License. *

* http://www.opensource.org/licenses/MIT *

* *

**************************************************************

#include <cstdio>

#include <string>

#include "exprtk.hpp"

template <typename T>

void stddev_example()

{

typedef exprtk::expression<T> expression_t;

typedef exprtk::parser<T> parser_t;

const std::string stddev_program =

" var x[25] := { "

" 1, 2, 3, 4, 5, "

" 6, 7, 8, 9, 10, "

" 11, 12, 13, 14, 15, "

" 16, 17, 18, 19, 20, "

" 21, 22, 23, 24, 25 "

" }; "

" "

" sqrt(sum([x - avg(x)]^2) / x[]) ";

expression_t expression;

parser_t parser;

parser.compile(stddev_program,expression);

const T stddev = expression.value();

printf("stddev(1..25) = %10.6f\n",stddev);

}

int main()

{

stddev_example<double>();

return 0;

}

exprtk/exprtk_simple_example_14.cpp at master · losttem/exprtk · GitHub

Expand file tree

Breadcrumbs

exprtk_simple_example_14.cpp

Latest commit

History

Breadcrumbs

exprtk_simple_example_14.cpp

File metadata and controls