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<a id="changed"></a>
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<a id="IndexChanged" class="indexterm"></a>
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<h2>
<span class="refentrytitle">changed</span>
</h2>
<p>changed —
k-rate signal change detector.
</p>
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<div class="refsect1">
<a id="idm281472947642184"></a>
<h2>Description</h2>
<p>
This opcode outputs a trigger signal that informs when any one of its k-rate arguments has changed. Useful with valuator widgets or MIDI controllers.
</p>
</div>
<div class="refsect1">
<a id="idm281472947640824"></a>
<h2>Syntax</h2>
<pre class="synopsis">ktrig <span class="command"><strong>changed</strong></span> kvar1 [, kvar2,..., kvarN]</pre>
</div>
<div class="refsect1">
<a id="idm281472947579768"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ktrig</em></span> - Outputs a value of 1 when any of the k-rate signals has changed, otherwise outputs 0.
</p>
<p>
<span class="emphasis"><em>kvar1 [, kvar2,..., kvarN]</em></span> - k-rate variables to watch for changes.
</p>
<p> </p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top"> If any of the kvars is non-zero at the first k-cycle
changed is called it will report a change. For more consistent
behaviour use <span class="emphasis"><em>changed2</em></span>.</td>
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<p>
</p>
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<div class="refsect1">
<a id="idm281472947575784"></a>
<h2>Examples</h2>
<p>
Here is an example of the changed opcode. It uses the file <a class="ulink" href="examples/changed.csd" target="_top"><em class="citetitle">changed.csd</em></a>.
</p>
<div class="example">
<a id="idm281472947574008"></a>
<p class="title">
<strong>Example 116. Example of the changed opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472781834920"></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">;;;RT 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 changed.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="kd">instr</span> <span class="nf">1</span>
k<span class="n">sig</span> <span class="nb">oscil</span> <span class="mi">2</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mi">1</span>
k<span class="n">int</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span>k<span class="n">sig</span><span class="p">)</span>
k<span class="n">trig</span> <span class="nb">changed</span> k<span class="n">int</span>
<span class="nb">printk</span> <span class="mf">0.2</span><span class="p">,</span> k<span class="n">int</span>
<span class="nb">printk2</span> k<span class="n">trig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1024</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">20</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 lines like:
</p>
<pre class="screen">
i 1 time 0.00267: 0.00000
i1 0.00000
i1 1.00000
i1 0.00000
i 1 time 0.20267: 1.00000
i 1 time 0.40267: 1.00000
i1 1.00000
i1 0.00000
i 1 time 0.60267: 1.00000
i 1 time 0.80267: 1.00000
i1 1.00000
i1 0.00000
i 1 time 1.00000: 0.00000
i1 1.00000
i1 0.00000
i 1 time 1.20267: -1.00000
i 1 time 1.40267: -1.00000
i1 1.00000
i1 0.00000
i 1 time 1.60267: -1.00000
i 1 time 1.80000: -1.00000
i1 1.00000
i1 0.00000
i 1 time 2.00000: -0.00000
i1 1.00000
i1 0.00000
.........
</pre>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472947570792"></a>
<h2>Credits</h2>
<p>Written by Gabriel Maldonado.</p>
<p>Example written by Andrés Cabrera.</p>
<p>New in Csound 7.</p>
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distrib
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Mageia
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armv7hl
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