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log1pf (3)
  • log1pf (3) ( FreeBSD man: Библиотечные вызовы )
  • log1pf (3) ( Русские man: Библиотечные вызовы )
  • >> log1pf (3) ( Linux man: Библиотечные вызовы )
  • log1pf (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    log1p, log1pf, log1pl -  logarithm of 1 plus argument
     
    

    SYNOPSIS

    #include <math.h>
    
    double log1p(double x);
    
    float log1pf(float x);
    long double log1pl(long double x);
    Link with -lm.

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    log1p(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
    log1pf(), log1pl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    DESCRIPTION

    log1p(x) returns a value equivalent to
    
        log (1 + x)
    
    
    It is computed in a way that is accurate even if the value of x is near zero.  

    RETURN VALUE

    On success, these functions return the natural logarithm of (1 + x).

    If x is a NaN, a NaN is returned.

    If x is positive infinity, positive infinity is returned.

    If x is -1, a pole error occurs, and the functions return -HUGE_VAL, -HUGE_VALF, or -HUGE_VALL, respectively.

    If x is less than -1 (including negative infinity), a domain error occurs, and a NaN (not a number) is returned.  

    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:

    Domain error: x is less than -1
    An invalid floating-point exception (FE_INVALID) is raised.
    Pole error: x is -1
    A divide-by-zero floating-point exception (FE_DIVBYZERO) is raised.

    These functions do not set errno.  

    CONFORMING TO

    C99, POSIX.1-2001.  

    SEE ALSO

    exp(3), expm1(3), log(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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