Christopher Fields > BioPerl-1.6.921 > Bio::Tools::RandomDistFunctions



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Module Version: 1.006921   Source   Latest Release: BioPerl-1.6.924


Bio::Tools::RandomDistFunctions - A set of routines useful for generating random data in different distributions


  use Bio::Tools::RandomDistFunctions;
  my $dist = Bio::Tools::RandomDistFunctions->new();
  for my $v ( 1..1000 ) { 
    my $birth_dist = $dist->rand_birth_distribution($lambda);
    # ... do something with the variable


Most of the code is based on the C implementation of these routines in Mike Sanderson's r8s's package. See for information on his software.

This code tries to be fast and use available faster BigInt and GMP library methods when those modules are available.


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AUTHOR - Jason Stajich ^



Thanks to Mike Sanderson for assistance in the getting this implementation together.


The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _


 Title   : rand_birth_distribution
 Usage   : my $randvar = $dist->
 Function: Returns a random number from a birth process waiting 
           time with a fixed interval
           1.0.  Times are measured from 0=present,1=root;
 Returns : floating point number
 Args    : $lambda ( > 0 )
 References : This is based on code by Mike Sanders in r8s.
              Ross, Stochastic Processes, p. 145 for the density


 Title   : rand_geometric_distribution
 Usage   : my $randvar = $dist->rand_geometric_distribution($param);
 Function: Returns a random geometric variate distributed with 
           parameter $param, according to
           c.d.f. 1 - ( 1- param) ^ n 
 Returns : integer
 Args    : $param ( 0 > $param < 1 )


 Title   : rand_exponentional_distribution
 Usage   : my $var = $dist->rand_exponentional_distribution($param);
 Function: Returns a random exponential variate distributed with parameter
           $param, according to c.d.f 1 - e^(-param * x)
 Returns : floating point number 
 Args    : $param ( > 0 )


 Title   : rand_normal_distribution
 Usage   : my $var = $dist->rand_normal_distribution()
 Function: Returns a random normal (gaussian) variate distributed 
 Returns : floating point number
 Args    : none
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