clog(3) on freebsd

NAME

clog, clogf and clogl – complex natural logarithm functions

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <complex.h>

double complex

clog(double complex z);

float complex

clogf(float complex z);

long double complex

clogl(long double complex z);

DESCRIPTION

The clog(), clogf(), and clogl() functions compute the complex natural logarithm of z. with a branch cut along the negative real axis .

RETURN VALUES

The clog() function returns the complex natural logarithm value, in the range of a strip mathematically unbounded along the real axis and in the interval [-I* , +I* ] along the imaginary axis. The function satisfies the relationship: clog(conj(z, Fc) = conj(clog(z, Fc).

Argument	Return value	Comment
-0 + I*0	- + I*	Divide-by-zero exception
		raised
+0 + I*0	- + I*0	Divide by zero exception
		raised
x + I*	+ + I*/2	For finite x
x + I*	+ I*	Optionally raises invalid
		floating-point exception
		for finite x
- + I*y	+ + I*	For finite positive-signed y
+ + I*y	+ + I*0	For finite positive-signed y
- + I*	+ + I*3/4
+ + I*	+ + I*/4
+ I*	+ + I*
+ I*y	+ I*	Optionally raises invalid
		floating-point exception
		for finite y
+ I*	+ + I*
+ I*	+ I*

STANDARDS

The clog(), cexpf(), and clogl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).

clog(3)