clogf3
Complex natural logarithm functions
Part of clog(3).
Usage
#include <complex.h>
double complex
clog(double complex z);
float complex
clogf(float complex z);
long double complex
clogl(long double complex z);
Library
Math Library (libm, -lm)
Overview
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* |
Releases
22 releases since FreeBSD 11.3-RELEASE; the text changed 9 times.