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<h4><a name="uk.ac.starlink.ttools.func.TrigDegrees">10.5.8 TrigDegrees</a></h4>
<p>Standard trigonometric functions with angles in degrees.</p>
<p>
<dl>
<dt><strong><code>sinDeg( theta )</code></strong></dt>
<dd>Sine of an angle.
<ul>
<li><code>theta</code> <em>(floating point)</em>: an angle, in degrees
</li>
<li>return value <em>(floating point)</em>: the sine of the argument
</li>
</ul>
</dd>
<dt><strong><code>cosDeg( theta )</code></strong></dt>
<dd>Cosine of an angle.
<ul>
<li><code>theta</code> <em>(floating point)</em>: an angle, in degrees
</li>
<li>return value <em>(floating point)</em>: the cosine of the argument
</li>
</ul>
</dd>
<dt><strong><code>tanDeg( theta )</code></strong></dt>
<dd>Tangent of an angle.
<ul>
<li><code>theta</code> <em>(floating point)</em>: an angle, in degrees
</li>
<li>return value <em>(floating point)</em>: the tangent of the argument.
</li>
</ul>
</dd>
<dt><strong><code>asinDeg( x )</code></strong></dt>
<dd>Arc sine.
The result is in the range of -90 through 90.
<ul>
<li><code>x</code> <em>(floating point)</em>: the value whose arc sine is to be returned.
</li>
<li>return value <em>(floating point)</em>: the arc sine of the argument in degrees
</li>
</ul>
</dd>
<dt><strong><code>acosDeg( x )</code></strong></dt>
<dd>Arc cosine.
The result is in the range of 0.0 through 180.
<ul>
<li><code>x</code> <em>(floating point)</em>: the value whose arc cosine is to be returned.
</li>
<li>return value <em>(floating point)</em>: the arc cosine of the argument in degrees
</li>
</ul>
</dd>
<dt><strong><code>atanDeg( x )</code></strong></dt>
<dd>Arc tangent.
The result is in the range of -90 through 90.
<ul>
<li><code>x</code> <em>(floating point)</em>: the value whose arc tangent is to be returned.
</li>
<li>return value <em>(floating point)</em>: the arc tangent of the argument in degrees
</li>
</ul>
</dd>
<dt><strong><code>atan2Deg( y, x )</code></strong></dt>
<dd>Converts rectangular coordinates (<code>x</code>,<code>y</code>)
to polar (<code>r</code>,<code>theta</code>).
This method computes the phase
<code>theta</code> by computing an arc tangent
of <code>y/x</code> in the range of -180 to 180.
<ul>
<li><code>y</code> <em>(floating point)</em>: the ordinate coordinate
</li>
<li><code>x</code> <em>(floating point)</em>: the abscissa coordinate
</li>
<li>return value <em>(floating point)</em>: the <code>theta</code> component in degrees of the point
(<code>r</code>,<code>theta</code>)
in polar coordinates that corresponds to the point
(<code>x</code>,<code>y</code>) in Cartesian coordinates.
</li>
</ul>
</dd>
</dl>
</p>
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<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
<a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
<a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
<a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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