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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);

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

    log (1 + x)

RETURN VALUE

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

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

SEE ALSO

COLOPHON

Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

CONFORMING TO

SEE ALSO

COLOPHON

Партнёры:

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