mirror of https://github.com/mkerrisk/man-pages
89 lines
2.0 KiB
Groff
89 lines
2.0 KiB
Groff
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
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.\" <mtk.manpages@gmail.com>
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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 SINCOS 3 2013-12-23 "GNU" "Linux Programmer's Manual"
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.SH NAME
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sincos, sincosf, sincosl \- calculate sin and cos simultaneously
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.SH SYNOPSIS
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.nf
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.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
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.B #include <math.h>
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.sp
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.BI "void sincos(double " x ", double *" sin ", double *" cos );
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.br
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.BI "void sincosf(float " x ", float *" sin ", float *" cos );
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.br
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.BI "void sincosl(long double " x ", long double *" sin ", long double *" cos );
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.fi
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.sp
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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Several applications need sine and cosine of the same angle
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.IR x .
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This function computes both at the same time, and stores the results in
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.I *sin
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and
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.IR *cos .
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If
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.I x
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is a NaN,
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a NaN is returned in
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.I *sin
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and
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.IR *cos .
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If
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.I x
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is positive infinity or negative infinity,
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a domain error occurs, and
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a NaN is returned in
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.I *sin
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and
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.IR *cos .
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.SH RETURN VALUE
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These functions return
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.IR void .
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.SH ERRORS
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See
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.BR math_error (7)
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for information on how to determine whether an error has occurred
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when calling these functions.
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.PP
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The following errors can occur:
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.TP
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Domain error: \fIx\fP is an infinity
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.\" .I errno
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.\" is set to
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.\" .BR EDOM .
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An invalid floating-point exception
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.RB ( FE_INVALID )
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is raised.
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.PP
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These functions do not set
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.IR errno .
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.\" FIXME . Is it intentional that these functions do not set errno?
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.\" sin() and cos() also don't set errno; bugs have been raised for
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.\" those functions.
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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 ATTRIBUTES
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.SS Multithreading (see pthreads(7))
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The
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.BR sincos (),
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.BR sincosf (),
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and
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.BR sincosl ()
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functions are thread-safe.
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.SH CONFORMING TO
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This function is a GNU extension.
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.SH SEE ALSO
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.BR cos (3),
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.BR sin (3),
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.BR tan (3)
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