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<head><title>atan2(RR,RR) -- compute an angle of a certain triangle</title>
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<div><h1>atan2(RR,RR) -- compute an angle of a certain triangle</h1>
<div class="single"><h2>Synopsis</h2>
<ul><li><div class="list"><dl class="element"><dt class="heading">Usage: </dt><dd class="value"><div><tt>atan2(y,x)</tt></div>
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<li><span>Function: <a href="_atan2_lp__R__R_cm__R__R_rp.html" title="compute an angle of a certain triangle">atan2</a></span></li>
<li><div class="single">Inputs:<ul><li><span><tt>y</tt>, <span>a <a href="___R__R.html">real number</a></span></span></li>
<li><span><tt>x</tt>, <span>a <a href="___R__R.html">real number</a></span></span></li>
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<li><div class="single">Outputs:<ul><li><span><span>a <a href="___R__R.html">real number</a></span>, the angle (in radians) formed with the x-axis by the ray from the origin to the point <tt>(x,y)</tt></span></li>
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<div class="single"><h2>Description</h2>
<div><table class="examples"><tr><td><pre>i1 : atan2(1,0)
o1 = 1.5707963267949
o1 : RR (of precision 53)</pre>
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<tr><td><pre>i2 : atan2(0,1)
o2 = 0
o2 : RR (of precision 53)</pre>
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<tr><td><pre>i3 : atan2(-1,-1)
o3 = -2.35619449019234
o3 : RR (of precision 53)</pre>
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<div class="single"><h2>See also</h2>
<ul><li><span><a href="_atan.html" title="compute the arctangent">atan</a> -- compute the arctangent</span></li>
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