<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>exprandi</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" /> <link rel="prev" href="exprand.html" title="exprand" /> <link rel="next" href="expseg.html" title="expseg" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">exprandi</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="exprand.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="expseg.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="exprandi"> <a id="exprandi"></a> <div class="titlepage"></div> <a id="IndexExprandiXClass" class="indexterm"></a> <a id="IndexExprandi" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">exprandi</span> </h2> <p>exprandi — Exponential distribution random number generator with interpolation (positive values only). </p> </div> <div class="refsect1" title="Description"> <a id="idp19597264"></a> <h2>Description</h2> <p> Exponential distribution random number generator with controlled interpolation between values (positive values only). This is an x-class noise generator. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp19641576"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>exprandi</strong></span> klambda, xamp, xcps</pre> <pre class="synopsis">ires <span class="command"><strong>exprandi</strong></span> klambda, xamp, xcps</pre> <pre class="synopsis">kres <span class="command"><strong>exprandi</strong></span> klambda, xamp, xcps</pre> </div> <div class="refsect1" title="Performance"> <a id="idp19644072"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>klambda</em></span> -- lambda parameter for the exponential distribution. </p> <p> The probablity density function of an exponential distribution is an exponential curve, whose mean is 0.69515/lambda. For more detailed explanation of these distributions, see: </p> <div class="orderedlist"> <ol class="orderedlist" type="1"> <li class="listitem"> <p>C. Dodge - T.A. Jerse 1985. Computer music. Schirmer books. pp.265 - 286</p> </li> <li class="listitem"> <p>D. Lorrain. A panoply of stochastic cannons. In C. Roads, ed. 1989. Music machine . Cambridge, Massachusetts: MIT press, pp. 351 - 379.</p> </li> </ol> </div> <p> </p> <p> <span class="emphasis"><em>xamp</em></span> -- range over which random numbers are distributed. </p> <p> <span class="emphasis"><em>xcps</em></span> -- the frequency which new random numbers are generated. </p> </div> <div class="refsect1" title="Examples"> <a id="idp19647776"></a> <h2>Examples</h2> <p> Here is an example of the exprandi opcode. It uses the file <a class="ulink" href="examples/exprandi.csd" target="_top"><em class="citetitle">exprandi.csd</em></a>. </p> <div class="example"> <a id="idp19648760"></a> <p class="title"> <strong>Example 217. Example of the exprandi opcode.</strong> </p> <div class="example-contents"> <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p> <pre class="programlisting"> <span class="csdtag"><CsoundSynthesizer></span> <span class="csdtag"><CsOptions></span> <span class="comment">; Select audio/midi flags here according to platform</span> -odac <span class="comment">;;;realtime audio out</span> <span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span> <span class="comment">; For Non-realtime ouput leave only the line below:</span> <span class="comment">; -o exprand.wav -W ;;; for file output any platform</span> <span class="csdtag"></CsOptions></span> <span class="csdtag"><CsInstruments></span> <span class="ohdr">sr</span> <span class="op">=</span> 44100 <span class="ohdr">ksmps</span> <span class="op">=</span> 32 <span class="ohdr">nchnls</span> <span class="op">=</span> 2 <span class="ohdr">0dbfs</span> <span class="op">=</span> 1 <span class="oblock">instr</span> 1 klambda <span class="opc">exprandi</span> 20, 1, 3 <span class="opc">printk2</span> klambda <span class="comment">; look</span> aout <span class="opc">oscili</span> 0.8, 440<span class="op">+</span>klambda, 1 <span class="comment">; & listen</span> <span class="opc">outs</span> aout, aout <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="comment">; sine wave</span> <span class="stamnt">f</span> 1 0 16384 10 1 <span class="stamnt">i</span> 1 0 4 <span class="stamnt">e</span> <span class="csdtag"></CsScore></span> <span class="csdtag"></CsoundSynthesizer></span> </pre> </div> </div> <p><br class="example-break" /> </p> </div> <div class="refsect1" title="See Also"> <a id="idp19651040"></a> <h2>See Also</h2> <p> <a class="link" href="exprand.html" title="exprand"><em class="citetitle">exprand</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="idp19652056"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: John ffitch</td> </tr> <tr> <td>Bath</td> </tr> <tr> <td>May 2011</td> </tr> <tr> <td>New in version 5.14</td> </tr> </table> <p> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="exprand.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="OpcodesTop.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="expseg.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">exprand </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> expseg</td> </tr> </table> </div> </body> </html>