1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
2 .\" Distributed under GPL
4 .\" Japanese Version Copyright (c) 2003 Akihiro MOTOKI
5 .\" all rights reserved.
6 .\" Translated Thu Jul 24 00:47:23 JST 2003
7 .\" by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
9 .\"WORD: square root 平方根
10 .\"WORD: branch cut 分枝切断
12 .TH CSQRT 3 2008-08-11 "" "Linux Programmer's Manual"
15 .\"O csqrt, csqrtf, csqrtl \- complex square root
16 csqrt, csqrtf, csqrtl \- 複素数の平方根
19 .B #include <complex.h>
21 .BI "double complex csqrt(double complex " z ");"
23 .BI "float complex csqrtf(float complex " z ");"
25 .BI "long double complex csqrtl(long double complex " z ");"
27 .\"O Link with \fI\-lm\fP.
31 .\"O Calculate the square root of a given complex number,
32 .\"O with nonnegative real part, and
33 .\"O with a branch cut along the negative real axis.
34 .\"O (That means that \fIcsqrt(\-1+eps*I)\fP will be close to I while
35 .\"O \fIcsqrt(\-1\-eps*I)\fP will be close to \-I, \fIif eps\fP is a small positive
39 実軸の負の部分に沿って分枝切断 (branch cut) がある。
40 (つまり、 \fIeps\fP を小さな正の実数とした場合、
41 \fIcsqrt(\-1+eps*I)\fP が I に近付いていき、
42 一方 \fIcsqrt(\-1\-eps*I)\fP は \-I に近付いていく、
46 .\"O These functions first appeared in glibc in version 2.1.
47 これらの関数は glibc バージョン 2.1 で初めて登場した。
48 .\"O .SH "CONFORMING TO"