Remove a row from uBlas compressed matrix?

Asked Jul 07 '11 at 04:13

Active Jul 22 '11 at 08:00

Viewed 884 times

I was wondering what was the best way to remove a row from uBlas's compressed matrix? I was wondering if there was some way to get a hold of the compressed column data inside the vector? I am looking at this page http://netlib.org/linalg/html_templates/node92.html and can't find how to access those elements.

My matrix is declared as follows:

  ublas::compressed_matrix
     <
     double,
     ublas::column_major,
     0,
     ublas::unbounded_array<int>,
     ublas::unbounded_array<double> >

My eventual goal is to use this method to remove all zero rows.

EDIT: I suspect the solution will involve changing the ublas::compressed_matrix structure internally. I think its safe to assume that the number of non-zero entries will be on the order of 1k. I hope to call the method to remove a row, maybe, 20 times.

edited Jul 22 '11 at 08:00

asked Jul 07 '11 at 04:13

Mikhail

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is a proxy an acceptable alternative? removing row is non-trival. – J-16 SDiZ Jul 07 '11 at 04:15
I'm not quite sure what you mean by a proxy. – Mikhail Jul 07 '11 at 04:22
and ublas don't use std::vector for storage – J-16 SDiZ Jul 07 '11 at 04:22
Matrix Proxies http://www.boost.org/doc/libs/1_46_1/libs/numeric/ublas/doc/matrix_proxy.htm , to be specific, the "Matrix Slice" object – J-16 SDiZ Jul 07 '11 at 04:24
1

I wouldn't have any problems using matrix proxies, but I don't quite see how it can help me remove a row in the middle of the matrix. – Mikhail Jul 07 '11 at 04:30
> I hope to call this method, maybe, 20 times. which one exactly? removing a row or removing all the zero rows? – unkulunkulu Jul 22 '11 at 07:50

Remove a row from uBlas compressed matrix?

0 Answers0