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    Command:

    lgammaf_r

    
    
    
    

    SYNOPSIS

           #include <math.h>
    
           double lgamma(double x);
           float lgammaf(float x);
           long double lgammal(long double x);
    
           double lgamma_r(double x, int *signp);
           float lgammaf_r(float x, int *signp);
           long double lgammal_r(long double x, int *signp);
    
           extern int signgam;
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           lgamma():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           lgammaf(), lgammal():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           lgamma_r(), lgammaf_r(), lgammal_r():
               _BSD_SOURCE || _SVID_SOURCE
           signgam:
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE
    
    
    

    DESCRIPTION

           For the definition of the Gamma function, see tgamma(3).
    
           The lgamma() function returns the natural  logarithm  of  the  absolute
           value  of  the  Gamma  function.   The  sign  of  the Gamma function is
           returned in the external integer signgam declared in <math.h>.  It is 1
           when the Gamma function is positive or zero, -1 when it is negative.
    
           Since  using  a constant location signgam is not thread-safe, the func-
           tions lgamma_r(), lgammaf_r(), and lgammal_r()  have  been  introduced;
           they return the sign via the argument signp.
    
    
    

    RETURN VALUE

           On success, these functions return the natural logarithm of Gamma(x).
    
           If x is a NaN, a NaN is returned.
    
           If x is 1 or 2, +0 is returned.
    
           If  x  is  positive infinity or negative infinity, positive infinity is
           returned.
           Pole error: x is a nonpositive integer
                  errno is set to ERANGE (but see BUGS).  A divide-by-zero  float-
                  ing-point exception (FE_DIVBYZERO) is raised.
    
           Range error: result overflow
                  errno  is  set  to ERANGE.  An overflow floating-point exception
                  (FE_OVERFLOW) is raised.
    
    
    

    CONFORMING TO

           The lgamma() functions are specified in C99 and POSIX.1-2001.   signgam
           is specified in POSIX.1-2001, but not in C99.  The lgamma_r() functions
           are nonstandard, but present on several other systems.
    
    
    

    BUGS

           In glibc 2.9 and earlier, when a pole error occurs,  errno  is  set  to
           EDOM;  instead of the POSIX-mandated ERANGE.  Since version 2.10, glibc
           does the right thing.
    
    
    

    SEE ALSO

           tgamma(3)
    
                                      2014-01-18                         LGAMMA(3)
    
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