개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

log1p(3m)

Mathematical Library Functions                                       log1p(3M)



NAME
       log1p, log1pf, log1pl - compute natural logarithm

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double log1p(double x);


       float log1pf(float x);


       long double log1pl(long double x);

DESCRIPTION
       These functions compute log(e)(1.0 + x).

RETURN VALUES
       Upon  successful  completion,  these functions return the natural loga‐
       rithm of 1.0 + x.


       If x is −1, a pole error occurs and  log1p(),  log1pf(),  and  log1pl()
       return −HUGE_VAL, −HUGE_VALF, and −HUGE_VALL, respectively.


       For finite values of x that are less than −1, or if x is −Inf, a domain
       error occurs and a NaN is returned.


       If x is NaN, a NaN is returned.


       If x is ±0 or +Inf, x is returned.


       For exceptional cases, matherr(3M) tabulates the values to be  returned
       by log1p() as specified by SVID3 and XPG3.

ERRORS
       These functions will fail if:

       Domain Error    The finite value of x is less than −1, or x is -Inf.

                       If   the   integer   expression   (math_errhandling   &
                       MATH_ERREXCEPT) is non-zero, the invalid floating-point
                       exception is raised.

                       The log1p() function sets errno to EDOM if the value of
                       x is less than −1.


       Pole Error      The value of x is −1.

                       If   the   integer   expression   (math_errhandling   &
                       MATH_ERREXCEPT)  is non-zero, the divide-by-zero float‐
                       ing-point exception is raised.


USAGE
       An application wanting to check for exceptions should  call  feclearex‐
       cept(FE_ALL_EXCEPT)  before  calling  these  functions.  On  return, if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
       non-zero,  an  exception  has been raised. An application should either
       examine the return value or check the floating point exception flags to
       detect exceptions.


       An  application  can  also  set  errno  to 0 before calling log1p(). On
       return, if errno is non-zero, an error has occurred. The  log1pf()  and
       log1pl() functions do not set errno.

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)


       ATTRIBUTE  TYPEATTRIBUTE  VALUE _ Interface StabilityCommitted _ Avail‐
       abilitysystem/library/math  _  MT-LevelMT-Safe  _   StandardSee   stan‐
       dards(7).


SEE ALSO
       math.h(3HEAD),   feclearexcept(3M),  fetestexcept(3M),  log(3M),  math‐
       err(3M), standards(7), attributes(7)



Solaris 11.4                     27 sept 2016                        log1p(3M)