erff Function

Calculates the error function of the argument.

Include

<math.h>

Prototype

float erff(float x);

Argument

x

upper limit of summation

Return Value

Calculates the error function of the argument, being the summation of the error function from zero to the argument value.

Example

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

int main(void)
{
  float x, y;

  x = 0.5;
  y = erff(x);
  printf("The summation of the error function from 0 to %f is %f\n", x, y);

  x = -0.75;
  y = erff(x);
  printf("The summation of the error function from 0 to %f is %f\n", x, y);
}

Example Output

The summation of the error function from 0 to 0.500000 is 0.520500
The summation of the error function from 0 to -0.750000 is -0.711156