mirror of https://github.com/mkerrisk/man-pages
35 lines
971 B
Groff
35 lines
971 B
Groff
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\"
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" Distributed under GPL
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.\" %%%LICENSE_END
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.\"
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.TH CSQRT 3 2008-08-11 "" "Linux Programmer's Manual"
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.SH NAME
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csqrt, csqrtf, csqrtl \- complex square root
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.SH SYNOPSIS
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.B #include <complex.h>
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.sp
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.BI "double complex csqrt(double complex " z ");"
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.br
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.BI "float complex csqrtf(float complex " z ");"
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.br
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.BI "long double complex csqrtl(long double complex " z ");"
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.sp
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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Calculate the square root of a given complex number,
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with nonnegative real part, and
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with a branch cut along the negative real axis.
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(That means that \fIcsqrt(\-1+eps*I)\fP will be close to I while
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\fIcsqrt(\-1\-eps*I)\fP will be close to \-I, \fIif eps\fP is a small positive
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real number.)
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.SH VERSIONS
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These functions first appeared in glibc in version 2.1.
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.SH CONFORMING TO
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C99.
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.SH SEE ALSO
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.BR cabs (3),
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.BR cexp (3),
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.BR complex (7)
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