| .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) |
| .\" Distributed under GPL |
| .\" |
| .TH CSQRT 3 2008-08-11 "" "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 nonnegative 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 VERSIONS |
| These functions first appeared in glibc in version 2.1. |
| .SH "CONFORMING TO" |
| C99. |
| .SH "SEE ALSO" |
| .BR cabs (3), |
| .BR cexp (3), |
| .BR complex (7) |
