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<a id="changed2"></a>
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<a id="IndexChanged2" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">changed2</span>
</h2>
<p>changed2 —
k-rate signal change detector.
</p>
</div>
<div class="refsect1">
<a id="idm281472947586056"></a>
<h2>Description</h2>
<p>
This opcode outputs a trigger signal that informs when any one
of its k-rate arguments has changed, or a value in an array. Useful with valuator widgets or MIDI controllers.
</p>
</div>
<div class="refsect1">
<a id="idm281472947584488"></a>
<h2>Syntax</h2>
<pre class="synopsis">ktrig <span class="command"><strong>changed2</strong></span> kvar1 [, kvar2,..., kvarN]</pre>
<pre class="synopsis">ktrig <span class="command"><strong>changed2</strong></span> karr[]</pre>
<pre class="synopsis">ktrig <span class="command"><strong>changed2</strong></span> aarr[]</pre>
</div>
<div class="refsect1">
<a id="idm281472947535864"></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, or any value in the array, otherwise outputs 0.
</p>
<p>
<span class="emphasis"><em>kvar1 [, kvar2,..., kvarN]</em></span> - k-rate variables to watch for changes.
</p>
<p>
<span class="emphasis"><em>xarray</em></span> - any array type.
</p>
<p>
Unlike the opcode <span class="emphasis"><em>changed</em></span> this opcode will
ever report the first cycle as a change.
</p>
</div>
<div class="refsect1">
<a id="idm281472947531128"></a>
<h2>Examples</h2>
<p>
Here are two examples of the changed2 opcode. They use the files
<a class="ulink" href="examples/changed2.csd" target="_top"><em class="citetitle">changed2.csd</em></a>
and <a class="ulink" href="examples/changed2a.csd" target="_top"><em class="citetitle">changed2a.csd</em></a>.
</p>
<div class="example">
<a id="idm281472947528328"></a>
<p class="title">
<strong>Example 117. Example of the changed2 opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472781165320"></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">changed2</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 class="example">
<a id="idm281472947524552"></a>
<p class="title">
<strong>Example 118. Example of the changed2 opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472781123240"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
-n
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
gk<span class="n">Array</span><span class="p">[][]</span> <span class="nb">init</span> <span class="mi">2</span><span class="p">,</span><span class="mi">3</span>
gk<span class="n">Array</span> <span class="nb">array</span> <span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">7</span><span class="p">,</span><span class="mi">6</span><span class="p">,</span><span class="mi">5</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">1</span> <span class="nb">changed2</span> gk<span class="n">Array</span>
<span class="k">if</span> k<span class="n">1</span><span class="o">==</span><span class="mi">1</span> <span class="k">then</span>
<span class="nb">printks</span> <span class="s">"An element in the array changed"</span><span class="p">,</span> <span class="mi">0</span>
<span class="k">endif</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span><span class="c1">; change value of channel 'step1'</span>
gk<span class="n">Array</span><span class="p">[</span><span class="mi">1</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="mi">3</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">100</span>
<span class="nb">i</span><span class="mi">2</span> <span class="mi">4</span> <span class="mf">.1</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<br class="example-break" />
</div>
<div class="refsect1">
<a id="idm281472947522760"></a>
<h2>Credits</h2>
<p>Written by John ffitch.</p>
<p>Example written by Andrés Cabrera.</p>
<p>New in Csound 6.7</p>
</div>
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