Re: [Boost-users] MultiArray and point-wise product

Subject: Re: [Boost-users] MultiArray and point-wise product
From: mike marchywka (marchywka_at_[hidden])
Date: 2009-11-30 09:39:16

On 11/30/09, Claudio Martella <claudio.martella_at_[hidden]> wrote:
> Hello list,
>
> I'm trying to calculate point-wise product from a MultiArray (basically
> the adjacency list from the boost graph).
> Can anybody suggest how the point-wise product can be calculated in
> boost in the most efficient way (of course i can implement the function
> myself with a nested for())?
>
> For those not familiar with point-wise product, it's defined as:
>
> A[i,j] = B[i,j] * C[i,j]
>
>

I would answer definitively "it depends." It is likely speed will
be limited by caching on an ia32 machine and preservinb locality
will be a high-priority. So, overall performance probably also depends
on what other stuff you are doing and trying to do things
in blocks. So, I guess I'd be asking the boost people to address memory
allocation strategies in answer to this question.  I think most people can avoid
VM but memory hierarchy may not always be considered.

> TIA
>
> /CM
>
> --
> Claudio Martella
> Digital Technologies
> Unit Research & Development - Analyst
>
> TIS innovation park
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> Fax  [phone]
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