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<div class="refentry" title="loop_lt">
<a id="loop_lt"></a>
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<h2>
<span class="refentrytitle">loop_lt</span>
</h2>
<p>loop_lt —
Looping constructions.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp28943320"></a>
<h2>Description</h2>
<p>
Construction of looping operations.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp28992088"></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" title="Initialization">
<a id="idp28993744"></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" title="Performance">
<a id="idp28995496"></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" title="Examples">
<a id="idp29002168"></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="idp29003144"></a>
<p class="title">
<strong>Example 404. 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>
<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 RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o loop_lt.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="ohdr">seed</span> 0
gisine <span class="ohdr">ftgen</span> 0, 0, 2^10, 10, 1
<span class="oblock">instr</span> 1 <span class="comment">;master instrument</span>
ininstr <span class="op">=</span> 5 <span class="comment">;number of called instances</span>
indx <span class="op">=</span> 0
<span class="olabel">loop</span><span class="op">:</span>
<span class="opc">prints</span> "play instance <span class="op">%</span>d\\n", indx
ipan <span class="opc">random</span> 0, 1
ifreq <span class="opc">random</span> 100, 1000
iamp <span class="op">=</span> 1<span class="op">/</span>ininstr
<span class="opc">event_i</span> "i", 10, 0, p3, iamp, ifreq, ipan
<span class="octrl">loop_lt</span> indx, 1, ininstr, <span class="olabel">loop</span>
<span class="oblock">endin</span>
<span class="oblock">instr</span> 10
ipeak <span class="opc">random</span> 0, 1 <span class="comment">;where is the envelope peak</span>
asig <span class="opc">poscil3</span> p4, p5, gisine
aenv <span class="opc">transeg</span> 0, p3<span class="op">*</span>ipeak, 6, 1, p3<span class="op">-</span>p3<span class="op">*</span>ipeak, <span class="op">-</span>6, 0
aL,aR <span class="opc">pan2</span> asig<span class="op">*</span>aenv, p6
<span class="opc">outs</span> aL, aR
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 10
<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 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" title="See Also">
<a id="idp29005968"></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.csounds.com/journal/2006summer/controlFlow_part2.html" target="_top"><em class="citetitle">http://www.csounds.com/journal/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" title="Credits">
<a id="idp29009280"></a>
<h2>Credits</h2>
<p>Istvan Varga.</p>
<p>New in Csound version 5.01</p>
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