csqrt man page

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).

InterfaceAttributeValue
csqrt(), csqrtf(), csqrtl()Thread safetyMT-Safe

Conforming to

C99, POSIX.1-2001, POSIX.1-2008.

See Also

cabs(3), cexp(3), complex(7)

Colophon

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Referenced By

complex(7), conj(3), sqrt(3).

csqrtf(3) and csqrtl(3) are aliases of csqrt(3).

2015-04-19 Linux Programmer's Manual