.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\" Distributed under GPL
.\"
.TH CSQRT 3 2002-07-28 "" "Linux Programmer's Manual"
.SH NAME
csqrt, csqrtf, csqrtl \- complex square root
.SH SYNOPSIS
.B #include <complex.h>
.sp
.BI "double complex csqrt(double complex " z ");"
.br
.BI "float complex csqrtf(float complex " z ");"
.br
.BI "long double complex csqrtl(long double complex " z ");"
.sp
Link with \fI\-lm\fP.
.SH DESCRIPTION
Calculate the square root of a given complex number,
with non-negative real part, and
with a branch cut along the negative real axis.
(That means that \fIcsqrt(\-1+eps*I)\fP will be close to I while
\fIcsqrt(\-1\-eps*I)\fP will be close to \-I, \fIif eps\fP is a small positive
real number.)
.SH "CONFORMING TO"
C99
.SH "SEE ALSO"
.BR cabs (3),
.BR cexp (3),
.BR complex (7)