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<title>Stdlib.Random</title>
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<h1>Module <a href="type_Stdlib.Random.html">Stdlib.Random</a></h1>
<pre><span id="MODULERandom"><span class="keyword">module</span> Random</span>: <code class="type"><a href="Random.html">Random</a></code></pre><hr width="100%">
<h2 id="1_Basicfunctions">Basic functions</h2>
<pre><span id="VALinit"><span class="keyword">val</span> init</span> : <code class="type">int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Initialize the generator, using the argument as a seed.
The same seed will always yield the same sequence of numbers.</p>
</div>
</div>
<pre><span id="VALfull_init"><span class="keyword">val</span> full_init</span> : <code class="type">int array -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same as <a href="Random.html#VALinit"><code class="code"><span class="constructor">Random</span>.init</code></a> but takes more data as seed.</p>
</div>
</div>
<pre><span id="VALself_init"><span class="keyword">val</span> self_init</span> : <code class="type">unit -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Initialize the generator with a random seed chosen
in a system-dependent way. If <code class="code">/dev/urandom</code> is available on
the host machine, it is used to provide a highly random initial
seed. Otherwise, a less random seed is computed from system
parameters (current time, process IDs).</p>
</div>
</div>
<pre><span id="VALbits"><span class="keyword">val</span> bits</span> : <code class="type">unit -> int</code></pre><div class="info ">
<div class="info-desc">
<p>Return 30 random bits in a nonnegative integer.</p>
</div>
<ul class="info-attributes">
<li><b>Before 3.12.0 </b> used a different algorithm (affects all the following
functions)</li>
</ul>
</div>
<pre><span id="VALint"><span class="keyword">val</span> int</span> : <code class="type">int -> int</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Random</span>.int bound</code> returns a random integer between 0 (inclusive)
and <code class="code">bound</code> (exclusive). <code class="code">bound</code> must be greater than 0 and less
than 2<sup class="superscript">30</sup>.</p>
</div>
</div>
<pre><span id="VALint32"><span class="keyword">val</span> int32</span> : <code class="type"><a href="Int32.html#TYPEt">Int32.t</a> -> <a href="Int32.html#TYPEt">Int32.t</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Random</span>.int32 bound</code> returns a random integer between 0 (inclusive)
and <code class="code">bound</code> (exclusive). <code class="code">bound</code> must be greater than 0.</p>
</div>
</div>
<pre><span id="VALnativeint"><span class="keyword">val</span> nativeint</span> : <code class="type"><a href="Nativeint.html#TYPEt">Nativeint.t</a> -> <a href="Nativeint.html#TYPEt">Nativeint.t</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Random</span>.nativeint bound</code> returns a random integer between 0 (inclusive)
and <code class="code">bound</code> (exclusive). <code class="code">bound</code> must be greater than 0.</p>
</div>
</div>
<pre><span id="VALint64"><span class="keyword">val</span> int64</span> : <code class="type"><a href="Int64.html#TYPEt">Int64.t</a> -> <a href="Int64.html#TYPEt">Int64.t</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Random</span>.int64 bound</code> returns a random integer between 0 (inclusive)
and <code class="code">bound</code> (exclusive). <code class="code">bound</code> must be greater than 0.</p>
</div>
</div>
<pre><span id="VALfloat"><span class="keyword">val</span> float</span> : <code class="type">float -> float</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Random</span>.float bound</code> returns a random floating-point number
between 0 and <code class="code">bound</code> (inclusive). If <code class="code">bound</code> is
negative, the result is negative or zero. If <code class="code">bound</code> is 0,
the result is 0.</p>
</div>
</div>
<pre><span id="VALbool"><span class="keyword">val</span> bool</span> : <code class="type">unit -> bool</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Random</span>.bool ()</code> returns <code class="code"><span class="keyword">true</span></code> or <code class="code"><span class="keyword">false</span></code> with probability 0.5 each.</p>
</div>
</div>
<h2 id="1_Advancedfunctions">Advanced functions</h2><p>The functions from module <a href="Random.State.html"><code class="code"><span class="constructor">Random</span>.<span class="constructor">State</span></code></a> manipulate the current state
of the random generator explicitly.
This allows using one or several deterministic PRNGs,
even in a multi-threaded program, without interference from
other parts of the program.</p>
<pre><span id="MODULEState"><span class="keyword">module</span> <a href="Random.State.html">State</a></span>: <code class="code"><span class="keyword">sig</span></code> <a href="Random.State.html">..</a> <code class="code"><span class="keyword">end</span></code></pre>
<pre><span id="VALget_state"><span class="keyword">val</span> get_state</span> : <code class="type">unit -> <a href="Random.State.html#TYPEt">State.t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Return the current state of the generator used by the basic functions.</p>
</div>
</div>
<pre><span id="VALset_state"><span class="keyword">val</span> set_state</span> : <code class="type"><a href="Random.State.html#TYPEt">State.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Set the state of the generator used by the basic functions.</p>
</div>
</div>
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