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The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group
NAME
clog, clogf, clogl - complex natural logarithm functions
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
[CX] ![[Option Start]](https://cdn.statically.io/img/web.archive.org/web/20190224011141im_/http://pubs.opengroup.org/onlinepubs/9699919799/images/opt-start.gif)
The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C
standard.
![[Option End]](https://cdn.statically.io/img/web.archive.org/web/20190224011141im_/http://pubs.opengroup.org/onlinepubs/9699919799/images/opt-end.gif)
These functions shall compute the complex natural (base e) logarithm of z, with a branch cut along the negative
real axis.
RETURN VALUE
These functions shall return 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.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
cexp
XBD <complex.h>
CHANGE HISTORY
First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.
End of informative text.
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