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diff --git a/man3/atan2.3 b/man3/atan2.3 new file mode 100644 index 000000000..ed4ff9580 --- /dev/null +++ b/man3/atan2.3 @@ -0,0 +1,63 @@ +.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) +.\" +.\" Permission is granted to make and distribute verbatim copies of this +.\" manual provided the copyright notice and this permission notice are +.\" preserved on all copies. +.\" +.\" Permission is granted to copy and distribute modified versions of this +.\" manual under the conditions for verbatim copying, provided that the +.\" entire resulting derived work is distributed under the terms of a +.\" permission notice identical to this one. +.\" +.\" Since the Linux kernel and libraries are constantly changing, this +.\" manual page may be incorrect or out-of-date. The author(s) assume no +.\" responsibility for errors or omissions, or for damages resulting from +.\" the use of the information contained herein. The author(s) may not +.\" have taken the same level of care in the production of this manual, +.\" which is licensed free of charge, as they might when working +.\" professionally. +.\" +.\" Formatted or processed versions of this manual, if unaccompanied by +.\" the source, must acknowledge the copyright and authors of this work. +.\" +.\" References consulted: +.\" Linux libc source code +.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) +.\" 386BSD man pages +.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) +.\" Modified 2002-07-27 by Walter Harms +.\" (walter.harms@informatik.uni-oldenburg.de) +.\" +.TH ATAN2 3 2002-07-27 "" "Linux Programmer's Manual" +.SH NAME +atan2, atan2f, atan2l \- arc tangent function of two variables +.SH SYNOPSIS +.nf +.B #include <math.h> +.sp +.BI "double atan2(double " y ", double " x ); +.sp +.BI "float atan2f(float " y ", float " x ); +.sp +.BI "long double atan2l(long double " y ", long double " x ); +.sp +.fi +Link with \-lm. +.SH DESCRIPTION +The \fBatan2()\fP function calculates the arc tangent of the two +variables \fIx\fP and \fIy\fP. It is similar to calculating the +arc tangent of \fIy\fP / \fIx\fP, except that the signs of both +arguments are used to determine the quadrant of the result. +.SH "RETURN VALUE" +The \fBatan2()\fP function returns the result in radians, which +is between -PI and PI (inclusive). +.SH "CONFORMING TO" +SVID 3, POSIX, BSD 4.3, ISO 9899. +The float and long double variants are C99 requirements. +.SH "SEE ALSO" +.BR acos (3), +.BR asin (3), +.BR atan (3), +.BR cos (3), +.BR sin (3), +.BR tan (3) |