[Numpy-discussion] Some help on matlab to numpy translation

Nicolas Rougier Nicolas.Rougier@loria...
Sat Mar 13 05:42:27 CST 2010


Thanks.
I agree that the use of ':' is a bit weird. 

Nicolas


On Mar 13, 2010, at 11:45 , Fabrice Silva wrote:

> Le samedi 13 mars 2010 à 10:20 +0100, Nicolas Rougier a écrit :
>> Hello,
>> I'm trying to translate a small matlab program for the simulation in a
>> 2D flow in a channel past a cylinder and since I do not have matlab
>> access, I would like to know if someone can help me, especially on
>> array indexing. The matlab source code is available at:
>> http://www.lbmethod.org/openlb/lb.examples.html and below is what I've
>> done so far in my translation effort. 
>> 
>> In the matlab code, there is a "ux" array of shape (1,lx,ly) and I do
>> not understand syntax: "ux(:,1,col)" with "col = [2:(ly-1)]". If
>> someone knows, that would help me a lot...
> 
> 
> As ux 's shape is (1,lx,ly), ux(:,1,col) is equal to ux(1,1,col) which
> is a vector with the elements [ux(1,1,2), ... ux(1,1,ly-1)].
> Using ":" juste after the reshape seems a lit bit silly...
> -- 
> Fabrice Silva
> LMA UPR CNRS 7051
> 
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