exprtk_simple_example_14.cpp File Reference

#include <cstdio>
#include <string>
#include "exprtk.hpp"

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Functions
template<typename T >
void	stddev_example ()
int	main ()

Function Documentation

main()

int main

(

)

Definition at line 53 of file exprtk_simple_example_14.cpp.

{
   stddev_example<double>();
   return 0;
}

stddev_example()

template<typename T >

void stddev_example

(

)

Definition at line 27 of file exprtk_simple_example_14.cpp.

{
   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);
}

References exprtk::parser< T >::compile().

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