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56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
/*
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**************************************************************
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* C++ Mathematical Expression Toolkit Library *
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* *
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* Simple Example 14 *
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* Author: Arash Partow (1999-2017) *
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* URL: http://www.partow.net/programming/exprtk/index.html *
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* *
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* Copyright notice: *
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* Free use of the Mathematical Expression Toolkit Library is *
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* permitted under the guidelines and in accordance with the *
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* most current version of the MIT License. *
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* http://www.opensource.org/licenses/MIT *
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* *
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**************************************************************
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*/
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#include <cstdio>
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#include <string>
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#include "exprtk.hpp"
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template <typename T>
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void stddev_example()
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{
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typedef exprtk::expression<T> expression_t;
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typedef exprtk::parser<T> parser_t;
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std::string stddev_program =
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" var x[25] := { "
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" 1, 2, 3, 4, 5, "
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" 6, 7, 8, 9, 10, "
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" 11, 12, 13, 14, 15, "
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" 16, 17, 18, 19, 20, "
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" 21, 22, 23, 24, 25 "
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" }; "
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" "
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" sqrt(sum([x - avg(x)]^2) / x[]) ";
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expression_t expression;
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parser_t parser;
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parser.compile(stddev_program,expression);
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T stddev = expression.value();
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printf("stddev(1..25) = %10.6f\n",stddev);
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}
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int main()
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{
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stddev_example<double>();
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return 0;
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}
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