Re: [ojAlgo-user] BasicMatrix get method is slow

[Anders P. <an...@op...>]

If you want to se what goes on then run the code in a debugger.

I’m guessing you have very complex structures inside your BasicMatrix instances because you create them “incorrectly” (repeated updates to individual elements).

> Y.get(U_i, P_i, C_i).doubleValue();

That line of code indicates that you extract something other than a ‘double’ from the BasicMatrix instances - why?

I recommended you before to switch to using PrimitiveDenseStore or maybe even ArrayAnyD<Double> instead of BasicMatrix. Why didn’t you?

Did you read?
https://github.com/optimatika/ojAlgo/wiki/Getting-Started


/Anders



> On 20 jan. 2016, at 17:40, Stathis Maroulis <sta...@gm...> wrote:
> 
> Hi,
> I am trying to create a Tensor API using Ojalgo as backend.
> Actually a 3D Tensor is an Arraylist of BasicMatrix objects.
> To get  element i,j,k from a tensor, I actually getting the i,j entry from the k-th oject on the arraylist.
> If i try to loop through all elements of these BasicMatrix object, the time i need is noticeable more or using Java double[][] arrays.
> E.g. accessing all element(using a triple-loop) of a 2000x20000x10 (10 BasicMatrix objects of dimension 2000x20000), i need hours(!!!!) of waiting, while will Java double[][] i need seconds...
> (This is the arraylist i got:
>  ArrayList<BasicMatrix> tensor;
> and this is how to get the items:
> Y.get(U_i, P_i, C_i).doubleValue();
> )
> 
> Is this behavior normal? Am I doing something wrong? 
> Thanks in advance.
> Stathis 
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