note 54210 deleted from function.rand by felipe

Note Submitter: roger at kleverNOSPAM dot co dot uk 

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umpalump's post was very helpful, thankyou.
Since random_0_1() can return 0, I would suggest replacing 
<? $x = random_0_1(); ?>
with  
<? while (!$x) $x = random_0_1(); ?>
to avoid an error when performing log($x)