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kiuliani / geoda

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Add manual seed to random number generator #102

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
So that LISA and other results that rely on random trials can be reproduced 
exactly, provide an option to see and supply the seed number for the random 
number function.

Original issue reported on code.google.com by mmcc...@gmail.com on 21 Feb 2014 at 2:54

GoogleCodeExporter commented 8 years ago 
LISA / Getis-Ord make use of parallel threads for random trials.  This greatly 
complicates the use of a common seed.  Perhaps we want to reconsider doing this 
feature?

Original comment by mmcc...@gmail.com on 21 Feb 2014 at 5:08

GoogleCodeExporter commented 8 years ago 
If I can find a pseudo random number generator, rng(val) with the property that 
rng(seed+n) is a good random value (and fast) for successive values of n, then 
could still use parallel processing with good/repeatable results using a common 
starting seed.  This will require some rewriting and testing to see that 
results are good and algorithm speed isn't too slow.

Original comment by mmcc...@gmail.com on 21 Feb 2014 at 5:16

GoogleCodeExporter commented 8 years ago 
Fully implemented for Getis-Ord and LISA.  Feature will appear in GeoDa 1.5.27 
or later.  See attached images for new menu options and seed entry dialog.  
Feature finished in SVN revision 3068

Original comment by mmcc...@gmail.com on 25 Feb 2014 at 12:20

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