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<div class="refentry" title="randomi">
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<h2>
<span class="refentrytitle">randomi</span>
</h2>
<p>randomi —
Generates a user-controlled random number series with interpolation between each new number.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp39972512"></a>
<h2>Description</h2>
<p>
Generates a user-controlled random number series with interpolation between each new number.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp39973216"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>randomi</strong></span> kmin, kmax, xcps [,imode] [,ifirstval]</pre>
<pre class="synopsis">kres <span class="command"><strong>randomi</strong></span> kmin, kmax, kcps [,imode] [,ifirstval]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp40022280"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imode</em></span> (optional, default=0) -- first interpolation cycle mode (see below)
</p>
<p>
<span class="emphasis"><em>ifirstval</em></span> (optional, default=0) -- first output value
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp40023624"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kmin</em></span> -- minimum range limit
</p>
<p>
<span class="emphasis"><em>kmax</em></span> -- maximum range limit
</p>
<p>
<span class="emphasis"><em>kcps, xcps</em></span> -- rate of random break-point generation
</p>
<p>
The <span class="emphasis"><em>randomi</em></span> opcode is similar to <a class="link" href="randi.html" title="randi"><em class="citetitle">randi</em></a> but allows the user to set arbitrary minimum and maximum values.
</p>
<p>
When <span class="emphasis"><em>imode</em></span> = 0 (the default), the <span class="emphasis"><em>kmin</em></span>
argument value is outputted during <span class="emphasis"><em>1/kcps</em></span> (resp.
<span class="emphasis"><em>1/xcps</em></span>) seconds at the beginning of the note, before
the first random number is generated. Then the normal interpolation process
takes place, first between <span class="emphasis"><em>kmin</em></span> and the first random
number generated, and then between successive generated random numbers,
each interpolation cycle having a duration of <span class="emphasis"><em>1/kcps</em></span>
(resp. <span class="emphasis"><em>1/xcps</em></span>) seconds.
</p>
<p>
When <span class="emphasis"><em>imode</em></span> = 1, a random number is generated at
initialization and interpolation begins immediately between the
<span class="emphasis"><em>kmin</em></span> argument value and that random number.
</p>
<p>
When <span class="emphasis"><em>imode</em></span> = 2, a random number is generated at
initialization and interpolation begins immediately between the
<span class="emphasis"><em>ifirstval</em></span> argument value and that random number.
</p>
<p>
When <span class="emphasis"><em>imode</em></span> = 3, two random numbers are generated
at initialization as breakpoints for the first interpolation cycle.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp40030672"></a>
<h2>Examples</h2>
<p>
Here is an example of the randomi opcode. It uses the file <a class="ulink" href="examples/randomi.csd" target="_top"><em class="citetitle">randomi.csd</em></a>.
</p>
<div class="example">
<a id="idp40031648"></a>
<p class="title">
<strong>Example 701. Example of the randomi 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 randomi.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</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="ohdr">seed</span> 0
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Choose a random frequency between 220 and 440.</span>
<span class="comment">; Generate new random numbers at 10 Hz.</span>
kmin <span class="opc">init</span> 220
kmax <span class="opc">init</span> 440
kcps <span class="opc">init</span> 10
imode <span class="op">=</span> p4
ifstval <span class="op">=</span> p5
<span class="opc">printf_i</span> "\nMode: %d\n", 1, imode
k1 <span class="opc">randomi</span> kmin, kmax, kcps, imode, ifstval
<span class="opc">printks</span> "k1 = %f\n", 0.1, k1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="comment">; each time with a different mode.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">i</span> 1 1 1 1
<span class="stamnt">i</span> 1 2 1 2 330
<span class="stamnt">i</span> 1 3 1 3
<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 lines like this:
</p>
<pre class="screen">
Mode: 0
k1 = 220.000000
k1 = 220.000000
k1 = 220.146093
k1 = 246.827703
k1 = 395.595775
...
Mode: 1
k1 = 220.000000
k1 = 224.325329
k1 = 274.370074
k1 = 343.216049
k1 = 414.324347
...
Mode: 2
k1 = 330.000000
k1 = 292.628171
k1 = 334.519777
k1 = 290.610602
k1 = 394.905366
...
Mode: 3
k1 = 360.727674
k1 = 431.680412
k1 = 380.625254
k1 = 289.267139
k1 = 303.038109
...</pre>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp40035088"></a>
<h2>See Also</h2>
<p>
<a class="link" href="randi.html" title="randi"><em class="citetitle">randi</em></a>,
<a class="link" href="random.html" title="random"><em class="citetitle">random</em></a>,
<a class="link" href="randomh.html" title="randomh"><em class="citetitle">randomh</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp40037088"></a>
<h2>Credits</h2>
<p>Author: Gabriel Maldonado</p>
<p>Arguments <span class="emphasis"><em>imode</em></span> and <span class="emphasis"><em>ifirstval</em></span>
added by François Pinot, Jan. 2011, after a discussion with Peiman Khosravi on
the csnd list.</p>
<p>Example written by Kevin Conder, adapted for new args by François Pinot.</p>
</div>
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