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    The following form allows you to view linux man pages.

    Command:

    erfl

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double erf(double x);
           float erff(float x);
           long double erfl(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           erf():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           erff(), erfl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The erf() function returns the error function of x, defined as
    
               erf(x) = 2/sqrt(pi)* integral from 0 to x of exp(-t*t) dt
    
    
    

    RETURN VALUE

           On  success, these functions return the error function of x, a value in
           the range [-1, 1].
    
           If x is a NaN, a NaN is returned.
    
           If x is +0 (-0), +0 (-0) is returned.
    
           If x is positive infinity (negative infinity), +1 (-1) is returned.
    
           If x is subnormal, a range  error  occurs,  and  the  return  value  is
           2*x/sqrt(pi).
    
    
    

    ERRORS

           See  math_error(7) for information on how to determine whether an error
           has occurred when calling these functions.
    
           The following errors can occur:
    
           Range error: result underflow (x is subnormal)
                  An underflow floating-point exception (FE_UNDERFLOW) is  raised.
    
           These functions do not set errno.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The erf(), erff(), and erfl() functions are thread-safe.
    
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