<?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>loop_lt</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="loop_le.html" title="loop_le" />
<link rel="next" href="loopseg.html" title="loopseg" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">loop_lt</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="loop_le.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="loopseg.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry">
<a id="loop_lt"></a>
<div class="titlepage"></div>
<a id="IndexLoop" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">loop_lt</span>
</h2>
<p>loop_lt —
Looping constructions.
</p>
</div>
<div class="refsect1">
<a id="idm281472918990392"></a>
<h2>Description</h2>
<p>
Construction of looping operations.
</p>
</div>
<div class="refsect1">
<a id="idm281472918947112"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>loop_lt</strong></span> indx, incr, imax, label</pre>
<pre class="synopsis"><span class="command"><strong>loop_lt</strong></span> kndx, kncr, kmax, label</pre>
</div>
<div class="refsect1">
<a id="idm281472918943784"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>indx</em></span> -- i-rate variable to count loop.
</p>
<p>
<span class="emphasis"><em>incr</em></span> -- value to increment the loop.
</p>
<p>
<span class="emphasis"><em>imax</em></span> -- maximum value of loop index.
</p>
</div>
<div class="refsect1">
<a id="idm281472918940440"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kndx</em></span> -- k-rate variable to count loop.
</p>
<p>
<span class="emphasis"><em>kncr</em></span> -- value to increment the loop.
</p>
<p>
<span class="emphasis"><em>kmax</em></span> -- maximum value of loop index.
</p>
<p>
The actions of <span class="command"><strong>loop_lt</strong></span> are equivalent to the
code
</p>
<pre class="programlisting">
indx <span class="op">=</span> indx <span class="op">+</span> incr
<span class="opc">if</span> (indx <span class="op"><</span> imax) <span class="opc">igoto</span> label</pre>
<p>
or
</p>
<pre class="programlisting">
kndx <span class="op">=</span> kndx <span class="op">+</span> kncr
<span class="opc">if</span> (kndx <span class="op"><</span> kmax) <span class="opc">kgoto</span> label</pre>
<p>
</p>
<div class="refsect1">
<a id="idm281472918927384"></a>
<h2>Examples</h2>
<p>
Here is an example of the loop_lt opcode. It uses the file <a class="ulink" href="examples/loop_lt.csd" target="_top"><em class="citetitle">loop_lt.csd</em></a>.
</p>
<div class="example">
<a id="idm281472918925608"></a>
<p class="title">
<strong>Example 482. Example of the loop_lt 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="idm281472745820472"></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>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o loop_lt.wav -W ;;; for file output any platform</span>
<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="nb">seed</span> <span class="mi">0</span>
gi<span class="n">sine</span> <span class="nb">ftgen</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="o">^</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">;master instrument</span>
i<span class="n">ninstr</span> <span class="o">=</span> <span class="mi">5</span> <span class="c1">;number of called instances</span>
i<span class="n">ndx</span> <span class="o">=</span> <span class="mi">0</span>
<span class="nl">loop</span><span class="p">:</span>
<span class="nb">prints</span> <span class="s">"play instance </span><span class="si">%d</span><span class="se">\\</span><span class="s">n"</span><span class="p">,</span> i<span class="n">ndx</span>
i<span class="n">pan</span> <span class="nb">random</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
i<span class="n">freq</span> <span class="nb">random</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">1000</span>
i<span class="n">amp</span> <span class="o">=</span> <span class="mi">1</span><span class="o">/</span>i<span class="n">ninstr</span>
<span class="nb">event_i</span> <span class="s">"i"</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> i<span class="n">amp</span><span class="p">,</span> i<span class="n">freq</span><span class="p">,</span> i<span class="n">pan</span>
<span class="k">loop_lt</span> i<span class="n">ndx</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> i<span class="n">ninstr</span><span class="p">,</span> <span class="nl">loop</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">10</span>
i<span class="n">peak</span> <span class="nb">random</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;where is the envelope peak</span>
a<span class="n">sig</span> <span class="nb">poscil3</span> <span class="nb">p4</span><span class="p">,</span> <span class="nb">p5</span><span class="p">,</span> gi<span class="n">sine</span>
a<span class="n">env</span> <span class="nb">transeg</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span>i<span class="n">peak</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="nb">p3</span><span class="o">-</span><span class="nb">p3</span><span class="o">*</span>i<span class="n">peak</span><span class="p">,</span> <span class="o">-</span><span class="mi">6</span><span class="p">,</span> <span class="mi">0</span>
a<span class="n">L</span><span class="p">,</span>a<span class="n">R</span> <span class="nb">pan2</span> a<span class="n">sig</span><span class="o">*</span>a<span class="n">env</span><span class="p">,</span> <span class="nb">p6</span>
<span class="nb">outs</span> a<span class="n">L</span><span class="p">,</span> a<span class="n">R</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="mi">10</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" />
Its output should include a line like this:
</p>
<pre class="screen">
play instance 0
play instance 1
play instance 2
play instance 3
play instance 4
</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a id="idm281472918920488"></a>
<h2>See Also</h2>
<p>
<a class="link" href="loop_ge.html" title="loop_ge"><em class="citetitle">loop_ge</em></a>,
<a class="link" href="loop_gt.html" title="loop_gt"><em class="citetitle">loop_gt</em></a> and
<a class="link" href="loop_le.html" title="loop_le"><em class="citetitle">loop_le</em></a>.
</p>
<p> More information on this opcode: <a class="ulink" href="http://www.csoundjournal.com/2006summer/controlFlow_part2.html" target="_top"><em class="citetitle">http://www.csoundjournal.com/2006summer/controlFlow_part2.html</em></a> , written by Steven Yi.
And in the Floss Manuals: <a class="ulink" href="http://en.flossmanuals.net/csound/ch018_c-control-structures" target="_top"><em class="citetitle"> http://en.flossmanuals.net/csound/ch018_c-control-structures</em></a></p>
</div>
<div class="refsect1">
<a id="idm281472918914216"></a>
<h2>Credits</h2>
<p>Istvan Varga.</p>
<p>New in Csound version 5.01</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="loop_le.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="loopseg.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">loop_le </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> loopseg</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-release
>
by-pkgid
>
5fcfcb7517038d1f44ab4e478e6e61fa
>
files
>
2385
