Mathematical Library Functions                            erf(3M)



NAME
     erf, erff, erfl - error function

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

     double erf(double x);


     float erff(float x);


     long double erfl(long double x);


DESCRIPTION
     These functions compute the error function of their argument
     x, defined as:

     2/sqrt(pi)*intregral from 0 to x of exp(-t*t) dt

RETURN VALUES
     Upon successful completion, these functions return the value
     of the error function.


     If x is NaN, a NaN is returned.


     If x is ]0, ]0 is returned.


     If x is ]Inf, ]1 is returned.


     If x is subnormal, 2/sqrt(pi) * 2 is returned.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:














SunOS 5.11          Last change: 12 Jul 2006                    1






Mathematical Library Functions                            erf(3M)



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     erfc(3M),  feclearexcept(3M),  fetestexcept(3M),  isnan(3M),
     math.h(3HEAD), attributes(5), standards(5)











































SunOS 5.11          Last change: 12 Jul 2006                    2