Re: [ublas] disabling the matrix expressions form sparse matrices

Subject: Re: [ublas] disabling the matrix expressions form sparse matrices
From: petros (pmamales_at_[hidden])
Date: 2012-03-10 23:30:33

Hi Naso,
Thx for responding.
I am looking into the compressed_matrix. I have resorted to some hackery
where –by hand- defined the type to not derive from the matrix_container
-extending this to the constructors, of course. And it works OK – there is a lot
of useful code there.
Now, given that the ublas matrix operations are not really optimized for performance
-although a lot of very good work is in place there - it is a bandage I am willing to live with.
I thought of deriving privately, but then it was too much work with the iterators and all.
The interesting thing is that, when I did it for matrix (actually had to hold a matrix and derive from
a matrix range for leading dimension requirement reasons) I had to explicitly derive from matrix_container
(vs2010, win7).
Hence I was hoping..
Thx again – especially on a Sat evening,
Petros

ps: I would like to point out that, no info exists in the compressed_matrix for whether this is, for example,. the upper triangular part
of a symmetric/hermitian matrix. This makes it, unavoidably, to be used primarily for storage and element insertion/access,
but not ready to be used for apps. I can imagine that probably this can be accommodated w/adaptors, but I think this ties ublas inwards
too much for broader use.
Just an opinion..

From: Nasos Iliopoulos 
Sent: Saturday, March 10, 2012 8:48 PM
To: ublas_at_[hidden] 
Subject: Re: [ublas] disabling the matrix expressions form sparse matrices

Petro,

If you mean using the uBlas sparse matrices as containers only and AFAIK this is not formally possible. I am sure though you can do it through some hackery, forking or wrapping, as long as you can satisfy binary compatibility between uBlas and vendor specific functions. Which sparse matrix type do you need?

Best,
Nasos

> From: pmamales_at_[hidden]
> To: ublas_at_[hidden]
> Date: Fri, 9 Mar 2012 20:35:39 -0500
> Subject: [ublas] disabling the matrix expressions form sparse matrices
> 
> Hi,
> is there a way to disable the matrix expressions of the sparse matrices ?
> I would like to use vendor provided functions for my calls.
> TIA,
> Petros
> 
> _______________________________________________
> ublas mailing list
> ublas_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/ublas
> Sent to: nasos_i_at_[hidden]

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