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<h1 class="header">Programming Ruby</h1>
<h3 class="subheader">The Pragmatic Programmer's Guide</h3>
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Copyright (c) 2001 by Addison Wesley Longman, Inc. This material may
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<font color="white" size="7">module Math</font>
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<p></p>
<H3>Index:</H3>
<a href="#Math.atan2">atan2</a>
<a href="#Math.cos">cos</a>
<a href="#Math.exp">exp</a>
<a href="#Math.frexp">frexp</a>
<a href="#Math.ldexp">ldexp</a>
<a href="#Math.log">log</a>
<a href="#Math.log10">log10</a>
<a href="#Math.sin">sin</a>
<a href="#Math.sqrt">sqrt</a>
<a href="#Math.tan">tan</a>
<p></p>
<hr>
<P></P>
The <code>Math</code> module contains module functions for basic
trigonometric and transcendental functions.
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constants
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<a name="Math.E">
<code>E</code>
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<td>2.718281828</td>
<td>Value of e (base of natural
logarithms)</td>
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<P></P>
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<a name="Math.PI">
<code>PI</code>
</a>
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<td>3.141592654</td>
<td>Value of PI</td>
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<font color="white" size="6">class methods
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<b>
<a name="Math.atan2">atan2</a>
</b>
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Math.atan2( <i>y, x</i> )
-> <i>aFloat</i>
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Computes the arc tangent given <i>y</i> and <i>x</i>. Returns -PI..PI.
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<b>
<a name="Math.cos">cos</a>
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Math.cos( <i>aNumeric</i> )
-> <i>aFloat</i>
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Computes the cosine of <i>aNumeric</i> (expressed
in radians).
Returns -1..1.
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<b>
<a name="Math.exp">exp</a>
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Math.exp( <i>aNumeric</i> )
-> <i>aFloat</i>
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<td></td>
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<P></P>
Returns e raised to the power of <i>aNumeric</i>.
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<b>
<a name="Math.frexp">frexp</a>
</b>
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Math.frexp( <i>aNumeric</i> )
-> <i>anArray</i>
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<P></P>
Returns a two-element array ([<i>aFloat, aFixnum</i>]) containing
the normalized fraction and exponent of <i>aNumeric</i>.
<P></P>
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<b>
<a name="Math.ldexp">ldexp</a>
</b>
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Math.ldexp( <i>aFloat</i>, <i>anInteger</i> )
-> <i>aFloat</i>
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Returns the value of <i>aFloat</i> *2<sup>
<i>anInteger</i>
</sup>.
<P></P>
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<b>
<a name="Math.log">log</a>
</b>
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Math.log( <i>aNumeric</i> )
-> <i>aFloat</i>
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Returns the natural logarithm of <i>aNumeric</i>.
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<b>
<a name="Math.log10">log10</a>
</b>
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Math.log10( <i>aNumeric</i> )
-> <i>aFloat</i>
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Returns the base 10 logarithm of <i>aNumeric</i>.
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<b>
<a name="Math.sin">sin</a>
</b>
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Math.sin( <i>aNumeric</i> )
-> <i>aFloat</i>
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<td></td>
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<P></P>
Computes the sine of <i>aNumeric</i> (expressed in
radians). Returns -1..1.
<P></P>
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<b>
<a name="Math.sqrt">sqrt</a>
</b>
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Math.sqrt( <i>aNumeric</i> )
-> <i>aFloat</i>
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<td></td>
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<P></P>
Returns the non-negative square root of <i>aNumeric</i>.
Raises <code>ArgError</code> if <i>aNumeric</i> is less than zero.
<P></P>
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<b>
<a name="Math.tan">tan</a>
</b>
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Math.tan( <i>aNumeric</i> )
-> <i>aFloat</i>
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<td></td>
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Returns the tangent of <i>aNumeric</i> (expressed in radians).
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<font size="-1">Extracted from the book "Programming Ruby -
The Pragmatic Programmer's Guide"</font>
<br>
<font size="-3">
Copyright
©
2001 by Addison Wesley Longman, Inc. This material may
be distributed only subject to the terms and conditions set forth in
the Open Publication License, v1.0 or later (the latest version is
presently available at
<a href="http://www.opencontent.org/openpub/">http://www.opencontent.org/openpub/</a>)).
<p></p>
Distribution of substantively modified versions of this document is
prohibited without the explicit permission of the copyright holder.
<p></p>
Distribution of the work or derivative of the work in any standard
(paper) book form is prohibited unless prior permission is obtained
from the copyright holder.
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