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<a id="y"></a>
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<a id="IndexYStatement" class="indexterm"></a>
<a id="IndexSeedStatement" class="indexterm"></a>
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<h2>
<span class="refentrytitle">y Statement (or Seed Statement)</span>
</h2>
<p>a —
Set seed for random numbers.
</p>
</div>
<div class="refsect1">
<a id="idm281472821026568"></a>
<h2>Description</h2>
<p>
Set seed for random numbers, either from p1 or, if omitted, the clock.
</p>
</div>
<div class="refsect1">
<a id="idm281472821025384"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>y</strong></span> [p1]</pre>
</div>
<div class="refsect1">
<a id="idm281472821023368"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>p1</em></span> -- An integer value between 0 and 2<sup>32</sup>
used as a new seed for random numbers. If omitted, the system clock value will be used instead.
</p>
</div>
<div class="refsect1">
<a id="idm281472820992552"></a>
<h2>Performance</h2>
<p>
The tilde symbol ˜ can be used in an expression wherever a number is permissible
to use. Each ˜ will evaluate to a random value between zero (0) and one (1).
If there is no y statement in the score, the pseudo-random generator will yield
the same numbers in each performance. If a fixed seed is given, a different
predictable series of pseudo-random numbers will be generated from this seed.
If a y statement is used without p1, the system clock will be used as a seed,
yielding a different series of pseudo-random numbers for each performance.
</p>
</div>
<div class="refsect1">
<a id="idm281472820990728"></a>
<h2>Examples</h2>
<p>
Here is an example of the y statement. It uses the file <a class="ulink" href="examples/y_statement.csd" target="_top"><em class="citetitle">y_statement.csd</em></a>.
</p>
<div class="example">
<a id="idm281472820988968"></a>
<p class="title">
<strong>Example 1178. Example of the y statement.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472683688184"></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>
<span class="c1">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="c1">;;;RT audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o 0dbfs.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; Initialize the global variables.</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">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="nb">print</span> <span class="nb">p4</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">y</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span> <span class="p">[</span><span class="o">~</span> <span class="o">*</span> <span class="mi">9</span> <span class="o">+</span> <span class="mi">1</span><span class="p">]</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">1</span> <span class="p">[</span><span class="o">~</span> <span class="o">*</span> <span class="mi">9</span> <span class="o">+</span> <span class="mi">1</span><span class="p">]</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">1</span> <span class="p">[</span><span class="o">~</span> <span class="o">*</span> <span class="mi">9</span> <span class="o">+</span> <span class="mi">1</span><span class="p">]</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">1</span> <span class="p">[</span><span class="o">~</span> <span class="o">*</span> <span class="mi">9</span> <span class="o">+</span> <span class="mi">1</span><span class="p">]</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" />
Each time this example is run, different values between 1 and 10 will be displayed.
The seed used will be displayed as well.
</p>
</div>
<div class="refsect1">
<a id="idm281472820986952"></a>
<h2>Credits</h2>
<p>Author: John ffitch, 2014</p>
<p>New in version 6.03</p>
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