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<div class="refentry" title="vcella">
<a id="vcella"></a>
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<h2>
<span class="refentrytitle">vcella</span>
</h2>
<p>vcella —
Cellular Automata
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp50792984"></a>
<h2>Description</h2>
<p>
Unidimensional Cellular Automata applied to Csound vectors
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp50845128"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>vcella</strong></span> ktrig, kreinit, ioutFunc, initStateFunc, \
iRuleFunc, ielements, irulelen [, iradius]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp50846336"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ioutFunc</em></span> - number of the table where the state of each cell is stored
</p>
<p>
<span class="emphasis"><em>initStateFunc</em></span> - number of a table containig the inital states of each cell
</p>
<p>
<span class="emphasis"><em>iRuleFunc</em></span> - number of a lookup table containing the rules
</p>
<p>
<span class="emphasis"><em>ielements</em></span> - total number of cells
</p>
<p>
<span class="emphasis"><em>irulelen</em></span> - total number of rules
</p>
<p>
<span class="emphasis"><em>iradius</em></span> (optional) - radius of Cellular Automata. At present time CA radius can be 1 or 2 (1 is the default)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp50849936"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ktrig</em></span> - trigger signal. Each time it is non-zero, a new generation of cells is evaluated
</p>
<p>
<span class="emphasis"><em>kreinit</em></span> - trigger signal. Each time it is non-zero, state of all cells is forced to be that of <span class="emphasis"><em>initStateFunc</em></span>.
</p>
<p>
<span class="emphasis"><em>vcella</em></span> supports unidimensional cellular automata, where the state of each cell is stored in <span class="emphasis"><em>ioutFunc</em></span>. So <span class="emphasis"><em>ioutFunc</em></span> is a vector containing current state of each cell. This variant vector can be used together with any other vector-based opcode, such as
<a class="link" href="adsynt.html" title="adsynt"><em class="citetitle">adsynt</em></a>,
<a class="link" href="vmap.html" title="vmap"><em class="citetitle">vmap</em></a>,
<a class="link" href="vpowv.html" title="vpowv"><em class="citetitle">vpowv</em></a> etc.
</p>
<p>
<span class="emphasis"><em>initStateFunc</em></span> is an input vector containing the inital value of the row of cells, while <span class="emphasis"><em>iRuleFunc</em></span> is an input vector containing the rules in the form of a lookup table. Notice that <span class="emphasis"><em>initStateFunc</em></span> and <span class="emphasis"><em>iRuleFunc</em></span> can be updated during the performance by means of other vector-based opcodes (for example <a class="link" href="vcopy.html" title="vcopy"><em class="citetitle">vcopy</em></a>) in order to force to change rules and status at performance time.
</p>
<p>
A new generation of cells is evaluated each time <span class="emphasis"><em>ktrig</em></span> contains a non-zero value. Also the status of all cells can be forced to assume the status corresponding to the contents of <span class="emphasis"><em>initStateFunc</em></span> each time <span class="emphasis"><em>kreinit</em></span> contains a non-zero value.
</p>
<p>
Radius of CA algorithm can be 1 or 2 (optional <span class="emphasis"><em>iradius</em></span> arguement).
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp50857888"></a>
<h2>Examples</h2>
<p>
Here is an example of the vcella opcode. It uses the file <a class="ulink" href="examples/vcella.csd" target="_top"><em class="citetitle">vcella.csd</em></a>.</p>
<p>
The following example uses <span class="emphasis"><em>vcella</em></span>
</p>
<div class="example">
<a id="idp50859280"></a>
<p class="title">
<strong>Example 928. Example of the vcella 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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o vcella.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; vcella.csd</span>
<span class="comment">; by Anthony Kozar</span>
<span class="comment">; This file demonstrates some of the new opcodes available in</span>
<span class="comment">; Csound 5 that come from Gabriel Maldonado's CsoundAV.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Cellular automata-driven oscillator bank using vcella and adsynt</span>
<span class="oblock">instr</span> 1
idur <span class="op">=</span> p3
iCArate <span class="op">=</span> p4 <span class="comment">; number of times per second the CA calculates new values</span>
<span class="comment">; f-tables for CA parameters</span>
iCAinit <span class="op">=</span> p5 <span class="comment">; CA initial states </span>
iCArule <span class="op">=</span> p6 <span class="comment">; CA rule values</span>
<span class="comment">; The rule is used as follows:</span>
<span class="comment">; the states (values) of each cell are summed with their neighboring cells within</span>
<span class="comment">; the specied radius (+/- 1 or 2 cells). Each sum is used as an index to read a </span>
<span class="comment">; value from the rule table which becomes the new state value for its cell.</span>
<span class="comment">; All new states are calculated first, then the new values are all applied </span>
<span class="comment">; simultaneously.</span>
ielements <span class="op">=</span> <span class="opc">ftlen</span>(iCAinit)
inumrules <span class="op">=</span> <span class="opc">ftlen</span>(iCArule)
iradius <span class="op">=</span> 1
<span class="comment">; create some needed tables</span>
iCAstate <span class="ohdr">ftgen</span> 0, 0, ielements, <span class="op">-</span>2, 0 <span class="comment">; will hold the current CA states</span>
ifreqs <span class="ohdr">ftgen</span> 0, 0, ielements, <span class="op">-</span>2, 0 <span class="comment">; will hold the oscillator frequency for each cell</span>
iamps <span class="ohdr">ftgen</span> 0, 0, ielements, <span class="op">-</span>2, 0 <span class="comment">; will hold the amplitude for each cell</span>
<span class="comment">; calculate cellular automata state</span>
ktrig <span class="opc">metro</span> iCArate <span class="comment">; trigger the CA to update iCArate times per second</span>
<span class="opc">vcella</span> ktrig, 0, iCAstate, iCAinit, iCArule, ielements, inumrules, iradius
<span class="comment">; scale CA state for use as amplitudes of the oscillator bank</span>
<span class="opc">vcopy</span> iamps, iCAstate, ielements
<span class="opc">vmult</span> iamps, (1<span class="op">/</span>3), ielements <span class="comment">; divide by 3 since state values are 0-3</span>
<span class="opc">vport</span> iamps, .01, ielements <span class="comment">; need to smooth the amplitude changes for adsynt</span>
<span class="comment">; we could use adsynt2 instead of adsynt, but it does not seem to be working</span>
<span class="comment">; i-time loop for calculating frequencies</span>
index <span class="op">=</span> 0
inew <span class="op">=</span> 1
iratio <span class="op">=</span> 1.125 <span class="comment">; just major second (creating a whole tone scale)</span>
<span class="olabel">loop1</span><span class="op">:</span>
<span class="opc">tableiw</span> inew, index, ifreqs, 0 <span class="comment">; 0 indicates integer indices</span>
inew <span class="op">=</span> inew <span class="op">*</span> iratio
index <span class="op">=</span> index <span class="op">+</span> 1
<span class="octrl">if</span> (index <span class="op"><</span> ielements) <span class="octrl">igoto</span> <span class="olabel">loop1</span>
<span class="comment">; create sound with additive oscillator bank</span>
ifreqbase <span class="op">=</span> 64
iwavefn <span class="op">=</span> 1
iphs <span class="op">=</span> 2 <span class="comment">; random oscillator phases</span>
kenv <span class="opc">linseg</span> 0.0, 0.5, 1.0, idur <span class="op">-</span> 1.0, 1.0, 0.5, 0.0
aosc <span class="opc">adsynt</span> kenv, ifreqbase, iwavefn, ifreqs, iamps, ielements, iphs
<span class="opc">out</span> aosc <span class="op">*</span> <span class="opc">ampdb</span>(68)
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 16384 10 1
<span class="comment">; This example uses a 4-state cellular automata</span>
<span class="comment">; Possible state values are 0, 1, 2, and 3</span>
<span class="comment">; CA initial state</span>
<span class="comment">; We have 16 cells in our CA, so the initial state table is size 16</span>
<span class="stamnt">f</span>10 0 16 -2 0 1 0 0 1 0 0 2 2 0 0 1 0 0 1 0
<span class="comment">; CA rule</span>
<span class="comment">; The maximum sum with radius 1 (3 cells) is 9, so we need 10 values in the rule (0-9)</span>
<span class="stamnt">f</span>11 0 16 -2 1 0 3 2 1 0 0 2 1 0
<span class="comment">; Here is our one and only note!</span>
<span class="stamnt">i</span>1 0 20 4 10 11
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp50861552"></a>
<h2>Credits</h2>
<p>Written by: Gabriel Maldonado.</p>
<p>New in Csound 5 (Previously available only on CsoundAV)</p>
<p>Example by: Anthony Kozar</p>
</div>
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