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List:       koffice-devel
Subject:    Re: porting to eigen2
From:       Benoît_Jacob <jacob () math ! jussieu ! fr>
Date:       2008-08-16 13:37:44
Message-ID: 200808161537.44570.jacob () math ! jussieu ! fr
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Replying to myself here. I've started looking at KSpread. It turns out that 
its matrices (called PointStorage) are sparse. Great, but Eigen2's Sparse 
module is not yet ready so for now we'll keep converting back and forth 
between dense and sparse. We'll reopen that discussion in the times of 
KOffice 2.1 and Eigen 2.1...

Cheers,
Benoit

On Thursday 14 August 2008 15:45:42 Benoît Jacob wrote:
> Hi KOffice folks,
>
> since eigen2 is now in kdesupport I'm going to port existing eigen1-using
> code to it. I would like to have your confirmation that it is still time to
> port KOffice code (as you're now in soft freeze -- but porting to eigen2
> isn't adding features). Cyrille agreed to that a few weeks ago, but that
> was a few weeks ago so I'd like your blessing again...
>
> A second thing is that I remember that in KSpread we couldn't use eigen1 to
> actually store the matrices as eigen1 was restricted to square matrices. So
> the code looked like
>
> if(matrix is square)
> {
> 	create eigen1 matrix from it (copy)
> 	use eigen1 to make computations on it
> }
>
> Now eigen2 handles non-square matrices so it could be used right away for
> storage, removing the need to make copies. I don't remember if this would
> be a trivial change or not; in case it is, do you agree that I do it?
>
> Cheers,
> Benoit
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> koffice-devel mailing list
> koffice-devel@kde.org
> https://mail.kde.org/mailman/listinfo/koffice-devel


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