2004-11-03 13:51:07 +00:00
|
|
|
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
|
|
|
|
.\" Distributed under GPL
|
|
|
|
.\"
|
2008-08-11 17:13:47 +00:00
|
|
|
.TH CSQRT 3 2008-08-11 "" "Linux Programmer's Manual"
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH NAME
|
|
|
|
csqrt, csqrtf, csqrtl \- complex square root
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.B #include <complex.h>
|
|
|
|
.sp
|
|
|
|
.BI "double complex csqrt(double complex " z ");"
|
2004-11-11 17:28:42 +00:00
|
|
|
.br
|
2004-11-03 13:51:07 +00:00
|
|
|
.BI "float complex csqrtf(float complex " z ");"
|
2004-11-11 17:28:42 +00:00
|
|
|
.br
|
2004-11-03 13:51:07 +00:00
|
|
|
.BI "long double complex csqrtl(long double complex " z ");"
|
|
|
|
.sp
|
2007-07-21 05:25:03 +00:00
|
|
|
Link with \fI\-lm\fP.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH DESCRIPTION
|
|
|
|
Calculate the square root of a given complex number,
|
2007-04-24 19:11:01 +00:00
|
|
|
with non-negative real part, and
|
2004-11-03 13:51:07 +00:00
|
|
|
with a branch cut along the negative real axis.
|
2007-12-24 14:41:56 +00:00
|
|
|
(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
|
2004-11-03 13:51:07 +00:00
|
|
|
real number.)
|
2008-08-11 17:13:47 +00:00
|
|
|
.SH VERSIONS
|
|
|
|
These functions first appeared in glibc in version 2.1.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH "CONFORMING TO"
|
2008-07-15 13:39:17 +00:00
|
|
|
C99.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH "SEE ALSO"
|
|
|
|
.BR cabs (3),
|
|
|
|
.BR cexp (3),
|
2006-04-21 01:24:06 +00:00
|
|
|
.BR complex (7)
|