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<div class="moz-cite-prefix">Le 29/04/2019 à 19:03, Jens Simon Strom
a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:bedbc996-9453-ee1c-9bd9-860d92442d6f@hslmg.de">
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<p>Hallo Scilab équipe,</p>
<p>In my application it is vital - in addition to the normal
focus when using seeds - that <i>different</i> seeds in
rand("seed",seed) produce <i>different</i> random number
series. (1) Is that the case?<br>
</p>
</blockquote>
<p>Yes. However with "rand" you have a periodicit of 2^31 (this is
explained in the help page).</p>
<p>Please use "grand" instead of "rand", as grand produces sequences
with better properties, moreover you have the choice of the basic
generator. The default one "Mersenne-Twister" has period 2^199937.
See the help page of grand for more details.<br>
</p>
<p>S.<br>
</p>
<blockquote type="cite"
cite="mid:bedbc996-9453-ee1c-9bd9-860d92442d6f@hslmg.de">
<p> </p>
<p>I am aware that seed has to be a non negative integer. (2) Are
there any further restrictions? (3) What is the upper bound?</p>
<p>The minimal example below is as expected.</p>
<p>Kind regards</p>
<p>Jens<br>
</p>
<pre style="font-family:Monospaced;font-style:normal;font-size:20.0;"><span style="color:rgb(0,0,0);">s1</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(102,102,102);">1e3</span><span style="color:rgb(0,0,0);">; </span>
<span style="color:rgb(0,0,0);">s2</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(102,102,102);">1e10</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(255,0,0);">"</span><span style="color:rgb(255,0,0);">seed</span><span style="color:rgb(255,0,0);">"</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">s1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">r1</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(102,102,102);">3</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(102,102,102);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(255,0,0);">"</span><span style="color:rgb(255,0,0);">seed</span><span style="color:rgb(255,0,0);">"</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">s2</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">r2</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(102,102,102);">3</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(102,102,102);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,102,102);font-style:italic;">//</span>
<span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(255,0,0);">"</span><span style="color:rgb(255,0,0);">seed</span><span style="color:rgb(255,0,0);">"</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">s1</span><span style="color:rgb(74,85,219);">)</span>
<span style="color:rgb(0,0,0);">r3</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(102,102,102);">3</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(102,102,102);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(255,0,0);">"</span><span style="color:rgb(255,0,0);">seed</span><span style="color:rgb(255,0,0);">"</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">s2</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">r4</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(102,102,102);">3</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(102,102,102);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">r1234</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(74,85,219);">[</span><span style="color:rgb(0,0,0);">r1</span> <span style="color:rgb(0,0,0);">r2</span> <span style="color:rgb(0,0,0);">r3</span> <span style="color:rgb(0,0,0);">r4</span><span style="color:rgb(74,85,219);">]
----------------------------------------------------
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</blockquote>
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<pre class="moz-signature" cols="72">--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
<a class="moz-txt-link-freetext" href="http://www.utc.fr/~mottelet">http://www.utc.fr/~mottelet</a></pre>
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