Syntax

#include <math.h>
double erf(double x);
double erfc(double x);

erf calculates the error function of erfc computes the value of 1.0 - erf(x). erfc is used in place of erf for large values of x.

erf returns a double value that represents the error function. erfc returns a double value representing 1.0 - erf.

This example uses erf and erfc to compute the error function of two numbers.

#include <stdio.h>
#include <math.h>

double smallx,largex,value;

int main(void)
{
   smallx = 0.1;
   largex = 10.0;
   value = erf(smallx);                                   /* value = 0.112463 */
   printf("Error value for 0.1: %lf\n", value);
   value = erfc(largex);                          /* value = 2.088488e-45     */
   printf("Error value for 10.0: %le\n", value);
   return 0;

   /****************************************************************************
      The output should be:

      Error value for 0.1: 0.112463
      Error value for 10.0: 2.088488e-45
   ****************************************************************************/
}

• bessel
  
• gamma

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