<?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>elseif</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="else.html" title="else" /> <link rel="next" href="endif.html" title="endif" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">elseif</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="else.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="endif.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="elseif"> <a id="elseif"></a> <div class="titlepage"></div> <a id="IndexElseif" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">elseif</span> </h2> <p>elseif — Defines another "if...then" condition when a "if...then" condition is false. </p> </div> <div class="refsect1" title="Description"> <a id="idp2947720"></a> <h2>Description</h2> <p> Defines another "if...then" condition when a "if...then" condition is false. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp2948456"></a> <h2>Syntax</h2> <pre class="synopsis"><span class="command"><strong>elseif</strong></span> xa R xb <span class="command"><strong>then</strong></span></pre> <p> where <span class="emphasis"><em>label</em></span> is in the same instrument block and is not an expression, and where <span class="emphasis"><em>R</em></span> is one of the Relational operators (<span class="emphasis"><em><</em></span>, <span class="emphasis"><em>=</em></span>, <span class="emphasis"><em><=</em></span>, <span class="emphasis"><em>==</em></span>, <span class="emphasis"><em>!=</em></span>) (and <span class="emphasis"><em>=</em></span> for convenience, see also under <a class="link" href="ControlConditional.html" title="Conditional Values"><em class="citetitle">Conditional Values</em></a>). </p> </div> <div class="refsect1" title="Performance"> <a id="idp2952144"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>elseif</em></span> is used inside of a block of code between the <a class="link" href="if.html" title="if"><em class="citetitle">"if...then"</em></a> and <a class="link" href="endif.html" title="endif"><em class="citetitle">endif</em></a> opcodes. When a "if...then" condition is false, it defines another "if...then" condition to be met. Any number of <span class="emphasis"><em>elseif</em></span> statements are allowed. </p> </div> <div class="refsect1" title="Examples"> <a id="idp19031480"></a> <h2>Examples</h2> <p> Here is an example of the elseif opcode. It uses the file <a class="ulink" href="examples/elseif.csd" target="_top"><em class="citetitle">elseif.csd</em></a>. </p> <div class="example"> <a id="idp19032432"></a> <p class="title"> <strong>Example 202. Example of the elseif 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 elseif.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 ipch <span class="op">=</span> <span class="opc">cpspch</span>(p4) ienv <span class="op">=</span> p5 <span class="octrl">if</span> (ienv <span class="op">==</span> 0) then <span class="comment">;ADSR</span> kenv <span class="opc">adsr</span> 0.05, 0.05, .95, .05 <span class="octrl">elseif</span> (ienv <span class="op">==</span> 1) then <span class="comment">;Linear Triangular Envelope</span> kenv <span class="opc">linseg</span> 0, p3 <span class="op">*</span> .5, 1, p3 <span class="op">*</span> .5, 0 <span class="octrl">elseif</span> (ienv <span class="op">==</span> 2) then <span class="comment">;Ramp Up</span> kenv <span class="opc">linseg</span> 0, p3 <span class="op">-</span> .01, 1, .01, 0 <span class="octrl">endif</span> aout <span class="opc">vco2</span> .8, ipch, 10 aout <span class="opc">moogvcf</span> aout, ipch <span class="op">+</span> (kenv <span class="op">*</span> 5 <span class="op">*</span> ipch) , .5 aout <span class="op">=</span> aout <span class="op">*</span> kenv <span class="opc">outs</span> aout, aout <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">i</span> 1 0 2 8.00 0 <span class="stamnt">i</span> 1 3 2 8.00 1 <span class="stamnt">i</span> 1 6 2 8.00 2 <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="idp19034640"></a> <h2>See Also</h2> <p> <a class="link" href="else.html" title="else"><em class="citetitle">else</em></a>, <a class="link" href="endif.html" title="endif"><em class="citetitle">endif</em></a>, <a class="link" href="goto.html" title="goto"><em class="citetitle">goto</em></a>, <a class="link" href="if.html" title="if"><em class="citetitle">if</em></a>, <a class="link" href="igoto.html" title="igoto"><em class="citetitle">igoto</em></a>, <a class="link" href="kgoto.html" title="kgoto"><em class="citetitle">kgoto</em></a>, <a class="link" href="tigoto.html" title="tigoto"><em class="citetitle">tigoto</em></a>, <a class="link" href="timout.html" title="timout"><em class="citetitle">timout</em></a> </p> <p> More information on this opcode: <a class="ulink" href="http://www.csounds.com/journal/2006spring/controlFlow.html" target="_top"><em class="citetitle">http://www.csounds.com/journal/2006spring/controlFlow.html</em></a> , written by Steven Yi </p> </div> <div class="refsect1" title="Credits"> <a id="idp19179584"></a> <h2>Credits</h2> <p>New in version 4.21</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="else.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="endif.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">else </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> endif</td> </tr> </table> </div> </body> </html>