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erf (3)
  • erf (3) ( Solaris man: Библиотечные вызовы )
  • erf (3) ( FreeBSD man: Библиотечные вызовы )
  • erf (3) ( Русские man: Библиотечные вызовы )
  • >> erf (3) ( Linux man: Библиотечные вызовы )
  • erf (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    erf, erff, erfl, - error function
     
    

    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; or cc -std=c99
    erff(), erfl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600|| _ISOC99_SOURCE; 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.  

    CONFORMING TO

    C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD.  

    SEE ALSO

    cerf(3), erfc(3), exp(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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