<cmath> (math.h)

function
<cmath> <ctgmath>

erf

     double erf  (double x);
      float erff (float x);
long double erfl (long double x);
     double erf (double x);
      float erf (float x);
long double erf (long double x);
     double erf (T x);           // additional overloads for integral types
Compute error function
error function Returns the error function value for x.

Header <tgmath.h> provides a type-generic macro version of this function.
Additional overloads are provided in this header (<cmath>) for the integral types: These overloads effectively cast x to a double before calculations (defined for T being any integral type).

Parameters

x
Parameter for the error function.

Return Value

Error function value for x.

Example

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/* erf example */
#include <stdio.h>      /* printf */
#include <math.h>       /* erf */

int main ()
{
  double param, result;
  param = 1.0;
  result = erf (param);
  printf ("erf (%f) = %f\n", param, result );
  return 0;
}


Output:

erf (1.000000) = 0.842701

See also