| .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) |
| .\" |
| .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE) |
| .\" Distributed under GPL |
| .\" %%%LICENSE_END |
| .\" |
| .TH CSQRT 3 2021-03-22 "" "Linux Programmer's Manual" |
| .SH NAME |
| csqrt, csqrtf, csqrtl \- complex square root |
| .SH SYNOPSIS |
| .nf |
| .B #include <complex.h> |
| .PP |
| .BI "double complex csqrt(double complex " z ");" |
| .BI "float complex csqrtf(float complex " z ");" |
| .BI "long double complex csqrtl(long double complex " z ");" |
| .PP |
| Link with \fI\-lm\fP. |
| .fi |
| .SH DESCRIPTION |
| These functions calculate the complex square root of |
| .IR z , |
| 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 ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .ad l |
| .nh |
| .TS |
| allbox; |
| lbx lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR csqrt (), |
| .BR csqrtf (), |
| .BR csqrtl () |
| T} Thread safety MT-Safe |
| .TE |
| .hy |
| .ad |
| .sp 1 |
| .SH CONFORMING TO |
| C99, POSIX.1-2001, POSIX.1-2008. |
| .SH SEE ALSO |
| .BR cabs (3), |
| .BR cexp (3), |
| .BR complex (7) |
