<?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><</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="greaterequal.html" title=">=" /> <link rel="next" href="lessequal.html" title="<=" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center"><</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="greaterequal.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="lessequal.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="<"> <a id="lessthan"></a> <div class="titlepage"></div> <a id="IndexLtColon" class="indexterm"></a> <a id="IndexLtQuestion" class="indexterm"></a> <a id="IndexLtExpression" class="indexterm"></a> <a id="IndexLt" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle"><</span> </h2> <p>< — Determines if one value is less than another. </p> </div> <div class="refsect1" title="Description"> <a id="idp12655728"></a> <h2>Description</h2> <p> Determines if one value is less than another. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp12656456"></a> <h2>Syntax</h2> <pre class="synopsis">(a <span class="command"><strong><</strong></span> b <span class="command"><strong>?</strong></span> v1 <span class="command"><strong>:</strong></span> v2)</pre> <p> where <span class="emphasis"><em>a</em></span>, <span class="emphasis"><em>b</em></span>, <span class="emphasis"><em>v1</em></span> and <span class="emphasis"><em>v2</em></span> may be expressions, but <span class="emphasis"><em>a</em></span>, <span class="emphasis"><em>b</em></span> not audio-rate. </p> </div> <div class="refsect1" title="Performance"> <a id="idp12659736"></a> <h2>Performance</h2> <p> In the above conditional, <span class="emphasis"><em>a</em></span> and <span class="emphasis"><em>b</em></span> are first compared. If the indicated relation is true (<span class="emphasis"><em>a</em></span> less than <span class="emphasis"><em>b</em></span>), then the conditional expression has the value of <span class="emphasis"><em>v1</em></span>; if the relation is false, the expression has the value of <span class="emphasis"><em>v2</em></span>. </p> <p> NB.: If <span class="emphasis"><em>v1</em></span> or <span class="emphasis"><em>v2</em></span> are expressions, these will be evaluated before the conditional is determined. </p> <p> In terms of binding strength, all conditional operators (i.e. the relational operators (<span class="emphasis"><em><</em></span>, etc.), and <span class="emphasis"><em>?</em></span>, and <span class="emphasis"><em>:</em></span> ) are weaker than the arithmetic and logical 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>). </p> <p> These are <span class="emphasis"><em>operators</em></span> not <span class="emphasis"><em>opcodes</em></span>. Therefore, they can be used within orchestra statements, but do not form complete statements themselves. </p> </div> <div class="refsect1" title="Examples"> <a id="idp12665712"></a> <h2>Examples</h2> <p> Here is an example of the < operator. It uses the file <a class="ulink" href="examples/lessthan.csd" target="_top"><em class="citetitle">lessthan.csd</em></a>. </p> <div class="example"> <a id="idp12666712"></a> <p class="title"> <strong>Example 21. Example of the < operator.</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 <.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> p4 ipitch <span class="op">=</span> (ipch <span class="op"><</span> 15 <span class="op">?</span> <span class="opc">cpspch</span>(ipch) <span class="op">:</span> ipch) <span class="comment">;if p4 is lower then 15, it assumes p4 to be pitch-class</span> <span class="opc">print</span> ipitch <span class="comment">;and not meant to be a frequency in Hertz</span> asig <span class="opc">poscil</span> .5, ipitch , 1 <span class="opc">outs</span> asig, asig <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">f</span>1 0 8192 10 1 <span class="comment">;sine wave</span> <span class="stamnt">i</span>1 0 3 8.00 <span class="comment">;pitch class</span> <span class="stamnt">i</span>1 4 3 800 <span class="comment">;frequency</span> <span class="stamnt">e</span> <span class="csdtag"></CsScore></span> <span class="csdtag"></CsoundSynthesizer></span> </pre> </div> </div> <p><br class="example-break" /> Its output should include lines like this: </p> <pre class="screen"> ipitch = 261.626 ipitch = 800.00</pre> <p> </p> </div> <div class="refsect1" title="See Also"> <a id="idp12669472"></a> <h2>See Also</h2> <p> <a class="link" href="equals.html" title="=="><em class="citetitle">==</em></a>, <a class="link" href="greaterequal.html" title=">="><em class="citetitle">>=</em></a>, <a class="link" href="greaterthan.html" title=">"><em class="citetitle">></em></a>, <a class="link" href="lessequal.html" title="<="><em class="citetitle"><=</em></a>, <a class="link" href="notequal.html" title="!="><em class="citetitle">!=</em></a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="greaterequal.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="lessequal.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">>= </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> <=</td> </tr> </table> </div> </body> </html>