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[u/mrichter/AliRoot.git] / PYTHIA8 / pythia8130 / xmldoc / RandomNumbersAndChecks.xml

<chapter name="Random-Number Seed">

<h2>Random-Numbers Seed</h2>

The seed of the random number generator can be set as follows:

<flag name="Random:setSeed" default="off">
Indicates whether a user-set seed should be used every time the 
<code>Pythia::init</code> routine is called. If off, the random number 
generator is initialized with its default seed at the beginning 
of the run, and never again. If on, each new <code>Pythia::init</code> 
call (should several be made in the same run) results in the random 
number being re-initialized, thereby possibly starting over with the 
same sequence, if you do not watch out.
</flag>

<modeopen name="Random:seed" default="-1" max="900000000">
The seed to be used, if <code>setSeed</code> is on.<br/>
A negative value gives the default seed,<br/> 
a value 0 gives a random seed based on the time, and<br/>
a value between 1 and 900,000,000 a unique different random number 
sequence.
</modeopen>

<p/>
See further <aloc href="RandomNumbers">here</aloc>.

</chapter>

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