CLOG
Section: Linux Programmer's Manual (3)
Updated: 2008-08-11
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NAME
clog, clogf, clogl - natural logarithm of a complex number
SYNOPSIS
#include <complex.h>
double complex clog(double complex z);
float complex clogf(float complex z);
long double complex clogl(long double complex z);
Link with -lm.
DESCRIPTION
The logarithm
clog()
is the inverse function of the exponential
cexp(3).
Thus, if y = clog(z), then z = cexp(y).
The imaginary part of
y
is chosen in the interval [-pi,pi].
One has:
clog(z) = log(cabs(z)) + I * carg(z)
Note that
z
close to zero will cause an overflow.
VERSIONS
These functions first appeared in glibc in version 2.1.
CONFORMING TO
C99.
SEE ALSO
cabs(3),
cexp(3),
clog10(3),
clog2(3),
complex(7)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- VERSIONS
-
- CONFORMING TO
-
- SEE ALSO
-
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