<?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>maparray</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <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="mandol.html" title="mandol" /> <link rel="next" href="marimba.html" title="marimba" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">maparray</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="mandol.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="marimba.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="maparray"></a> <div class="titlepage"></div> <a id="IndexMaparray" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">maparray</span> </h2> <p>maparray — Apply a function to every element of a vector. </p> </div> <div class="refsect1"> <a id="idm281472916435480"></a> <h2>Description</h2> <p> Apply a function of one argument to every element of a vector (one-dimensional k-rate array). </p> </div> <div class="refsect1"> <a id="idm281472916444120"></a> <h2>Syntax</h2> <pre class="synopsis">karray <span class="command"><strong>maparray</strong></span> kinarray, String</pre> <pre class="synopsis">karray <span class="command"><strong>maparray_i</strong></span> kinarray, String</pre> </div> <div class="refsect1"> <a id="idm281472916374632"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>String</em></span> -- a string that names an opcode function, at i-rate for maparray_i or k-rate for maparray. </p> </div> <div class="refsect1"> <a id="idm281472916372952"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>karray</em></span> -- array for answers. </p> <p> <span class="emphasis"><em>kinarray</em></span> -- array for arguments to the function. </p> </div> <div class="refsect1"> <a id="idm281472916370440"></a> <h2>Examples</h2> <p> Here is an example of the maparray opcode. It uses the file <a class="ulink" href="examples/maparray.csd" target="_top"><em class="citetitle">maparray.csd</em></a>. </p> <div class="example"> <a id="idm281472916368584"></a> <p class="title"> <strong>Example 518. Example of the maparray 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> <div class="refsect1"> <a id="idm281472740899800"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> <span class="c1">; Select audio/midi flags here according to platform</span> -n <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span> <span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span> <span class="kd">instr</span> <span class="nf">1</span> <span class="c1">;create an array and fill with numbers</span> k<span class="n">ArrSrc</span><span class="p">[]</span> <span class="nb">fillarray</span> <span class="mf">1.01</span><span class="p">,</span> <span class="mf">2.02</span><span class="p">,</span> <span class="mf">3.03</span><span class="p">,</span> <span class="mf">4.05</span><span class="p">,</span> <span class="mf">5.08</span><span class="p">,</span> <span class="mf">6.13</span><span class="p">,</span> <span class="mf">7.21</span> <span class="c1">;print source array</span> <span class="nb">printf</span> <span class="s">"%s"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"</span><span class="se">\n</span><span class="s">Source array:</span><span class="se">\n</span><span class="s">"</span> k<span class="n">ndx</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">until</span> k<span class="n">ndx</span> <span class="o">==</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">ArrSrc</span><span class="p">)</span> <span class="k">do</span> <span class="nb">printf</span> <span class="s">"kArrSrc[</span><span class="si">%d</span><span class="s">] = %f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> k<span class="n">ndx</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span> k<span class="n">ndx</span><span class="p">,</span> k<span class="n">ArrSrc</span><span class="p">[</span>k<span class="n">ndx</span><span class="p">]</span> k<span class="n">ndx</span> <span class="o">+=</span> <span class="mi">1</span> <span class="k">od</span> <span class="c1">;create an empty array for the results</span> k<span class="n">ArrRes</span><span class="p">[]</span> <span class="nb">init</span> <span class="mi">7</span> <span class="c1">;apply the sqrt() function to each element</span> k<span class="n">ArrRes</span> <span class="nb">maparray</span> k<span class="n">ArrSrc</span><span class="p">,</span> <span class="s">"sqrt"</span> <span class="c1">;print the result</span> <span class="nb">printf</span> <span class="s">"%s"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"</span><span class="se">\n</span><span class="s">Result after applying sqrt() to source array</span><span class="se">\n</span><span class="s">"</span> k<span class="n">ndx</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">until</span> k<span class="n">ndx</span> <span class="o">==</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">ArrRes</span><span class="p">)</span> <span class="k">do</span> <span class="nb">printf</span> <span class="s">"kArrRes[</span><span class="si">%d</span><span class="s">] = %f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> k<span class="n">ndx</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span> k<span class="n">ndx</span><span class="p">,</span> k<span class="n">ArrRes</span><span class="p">[</span>k<span class="n">ndx</span><span class="p">]</span> k<span class="n">ndx</span> <span class="o">+=</span> <span class="mi">1</span> <span class="k">od</span> <span class="c1">;apply the log() function to each element</span> k<span class="n">ArrRes</span> <span class="nb">maparray</span> k<span class="n">ArrSrc</span><span class="p">,</span> <span class="s">"log"</span> <span class="c1">;print the result</span> <span class="nb">printf</span> <span class="s">"%s"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"</span><span class="se">\n</span><span class="s">Result after applying log() to source array</span><span class="se">\n</span><span class="s">"</span> k<span class="n">ndx</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">until</span> k<span class="n">ndx</span> <span class="o">==</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">ArrRes</span><span class="p">)</span> <span class="k">do</span> <span class="nb">printf</span> <span class="s">"kArrRes[</span><span class="si">%d</span><span class="s">] = %f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> k<span class="n">ndx</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span> k<span class="n">ndx</span><span class="p">,</span> k<span class="n">ArrRes</span><span class="p">[</span>k<span class="n">ndx</span><span class="p">]</span> k<span class="n">ndx</span> <span class="o">+=</span> <span class="mi">1</span> <span class="k">od</span> <span class="c1">;apply the int() function to each element</span> k<span class="n">ArrRes</span> <span class="nb">maparray</span> k<span class="n">ArrSrc</span><span class="p">,</span> <span class="s">"int"</span> <span class="c1">;print the result</span> <span class="nb">printf</span> <span class="s">"%s"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"</span><span class="se">\n</span><span class="s">Result after applying int() to source array</span><span class="se">\n</span><span class="s">"</span> k<span class="n">ndx</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">until</span> k<span class="n">ndx</span> <span class="o">==</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">ArrRes</span><span class="p">)</span> <span class="k">do</span> <span class="nb">printf</span> <span class="s">"kArrRes[</span><span class="si">%d</span><span class="s">] = %f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> k<span class="n">ndx</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span> k<span class="n">ndx</span><span class="p">,</span> k<span class="n">ArrRes</span><span class="p">[</span>k<span class="n">ndx</span><span class="p">]</span> k<span class="n">ndx</span> <span class="o">+=</span> <span class="mi">1</span> <span class="k">od</span> <span class="c1">;apply the frac() function to each element</span> k<span class="n">ArrRes</span> <span class="nb">maparray</span> k<span class="n">ArrSrc</span><span class="p">,</span> <span class="s">"frac"</span> <span class="c1">;print the result</span> <span class="nb">printf</span> <span class="s">"%s"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"</span><span class="se">\n</span><span class="s">Result after applying frac() to source array</span><span class="se">\n</span><span class="s">"</span> k<span class="n">ndx</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">until</span> k<span class="n">ndx</span> <span class="o">==</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">ArrRes</span><span class="p">)</span> <span class="k">do</span> <span class="nb">printf</span> <span class="s">"kArrRes[</span><span class="si">%d</span><span class="s">] = %f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> k<span class="n">ndx</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span> k<span class="n">ndx</span><span class="p">,</span> k<span class="n">ArrRes</span><span class="p">[</span>k<span class="n">ndx</span><span class="p">]</span> k<span class="n">ndx</span> <span class="o">+=</span> <span class="mi">1</span> <span class="k">od</span> <span class="c1">;turn instrument instance off</span> <span class="nb">turnoff</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mf">0.1</span> <span class="nb">e</span> <span class="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <p><br class="example-break" /> </p> </div> <div class="refsect1"> <a id="idm281472916364392"></a> <h2>See Also</h2> <p> <a class="link" href="vectorial.html" title="Vectorial Opcodes"><em class="citetitle"></em>Vectorial opcodes</a> </p> </div> <div class="refsect1"> <a id="idm281472916362344"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: John ffitch</td> </tr> <tr> <td>Codemist Ltd</td> </tr> <tr> <td>2013</td> </tr> </table> <p> </p> <p>New in version 6.00</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="mandol.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="marimba.html">Next</a></td> </tr> <tr> <td width="40%" align="left" 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