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    Command:

    log1pl

    
    
    

    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 ||
               _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           log1pf(), log1pl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               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
    
                                      2014-02-28                          LOG1P(3)
    
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