csqrt (3)

Leading comments

Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)

%%%LICENSE_START(GPL_NOVERSION_ONELINE)
Distributed under GPL
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(The comments found at the beginning of the groff file "man3/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

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