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<TITLE>atan2</TITLE>
<body bgcolor="#ffffcc">
<hr>
<pre>
<h3>ATAN2(3) Linux Programmer's Manual ATAN2(3)
</h3>
<h3>NAME
</h3> atan2 - arc tangent function of two variables
<h3>SYNOPSIS
</h3> #include <math.h>
double atan2(double y, double x);
<h3>DESCRIPTION
</h3> The atan2() function calculates the arc tangent of the two
variables x and y. It is similar to calculating the arc
tangent of y / x, except that the signs of both arguments
are used to determine the quadrant of the result.
<h3>RETURN VALUE
</h3> The atan2() function returns the result in radians, which
is between -PI and PI (inclusive).
<h3>CONFORMING TO
</h3> SVID 3, POSIX, BSD 4.3, ISO 9899
</pre>
<hr>
<h3>SEE ALSO
</h3><p>
<a href=acos.htm>acos</a>,
<a href=asin.htm>asin</a>,
<a href=atan.htm>atan</a>,
<a href=cos.htm>cos</a>,
<a href=sin.htm>sin</a>,
<a href=tan.htm>tan</a>,
<pre>
June 8, 1993 1
</pre>
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