05-09-2017
Quote:
Originally Posted by
RudiC
What if the imaginary part is negative as in the cube root of -1?
In that case I wait for your response...
For my first file I didn't have negative imaginary part.
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CSQRT(3) Linux Programmer's Manual CSQRT(3)
NAME
csqrt, csqrtf, csqrtl - complex square root
SYNOPSIS
#include <complex.h>
double complex csqrt(double complex z);
float complex csqrtf(float complex z);
long double complex csqrtl(long double complex z);
Link with -lm.
DESCRIPTION
These functions calculate the complex square root of z, with a branch cut along the negative real axis. (That means that csqrt(-1+eps*I)
will be close to I while csqrt(-1-eps*I) will be close to -I, if eps is a small positive real number.)
VERSIONS
These functions first appeared in glibc in version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+----------------------------+---------------+---------+
|Interface | Attribute | Value |
+----------------------------+---------------+---------+
|csqrt(), csqrtf(), csqrtl() | Thread safety | MT-Safe |
+----------------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
SEE ALSO
cabs(3), cexp(3), complex(7)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
2017-09-15 CSQRT(3)