[Scilab-users] matrix of combinations

[paul.carrico at free.fr]

Hi samuel,

(thanks) 

I'm still under the latest stable Scilab release 5.5.x ... but it sounds a good opportunity to move to 6.0 one.

I've 2 servers (both under CentOS) having different features :
- 2 CPU-s with 120 Go of memory
- 8 CPU's with 30 Go of memory

the latest one is probably the more interesting for the current application :-)

I'll have a look to the scidoe module

Paul

----- Mail original -----
De: "Samuel Gougeon" <sgougeon at free.fr>
À: "Users mailing list for Scilab" <users at lists.scilab.org>
Envoyé: Jeudi 9 Juin 2016 18:10:36
Objet: Re: [Scilab-users] matrix of combinations



Hello Paul, 

Le 09/06/2016 17:28, Carrico, Paul a écrit : 





Dear all 



(not sure to really master the topic but …) 



In my current study, I’ve 16 variables that I would like to perturbate 10 times ; of course each variable is different from the others. 

A1 = 10 + 2*rand(10,1,”uniform”) 

A2 = 5 + 0.5*rand(10,1,”uniform”) 

… 

A16 = 0.2 +0.01**rand(10,1,”uniform”) 





Except if I’m mistaken, I’ve about 16^10=1E12 combinations that is a (16xn) huge matrix M (n greater than 6E10) : how can I create such matrix ? It depends how you build a sample: is a sample a {A1(i), A2(j),......., A16(x)} set? 
Then, there are 10^16 possibilities. 
You can build them with ndgrid(), provided that you have hexabytes of RAM, (really) many processors, and of course Scilab 6. Do you? :) 
Or you may have a look at DOE theory, and tools: https://atoms.scilab.org/toolboxes/scidoe 

BR 
Samuel 


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