[ublas] CSR MATRIX creation from 3 arrays

Subject: [ublas] CSR MATRIX creation from 3 arrays
From: Riccardo Rossi (rrossi_at_[hidden])
Date: 2009-07-21 03:50:17

Hi everyone.

      I would like a hint on the creation of a compressed_matrix in
ublas:

i have currently three vectors of the type (Say)
double* values
int* column_indices
int* row_indices

exactly the same as the internals that are needed inside the ublas
compressed matrix. I also know all of the data i may wish to have on my
matrix.

How can i use this data to construct a ublas matrix ... without doing a
copy? (a bit in the spirit of the carray stuff ...)

The issue i describe is very frequently encountered in many different
contexts. For example i may wish to allocate myself the values and
column_indices vectors so to have control on the data locality in
openmp 

any suggestion on this would be very welcome
thank you for the attention

Riccardo

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________________________________________________________________
Riccardo Rossi, Ph.D, Civil Engineer
member of the Kratos Group: kratos.cimne.upc.es
Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE)
Universidad Politécnica de Cataluña (UPC)
Edificio C-1, campus Norte UPC
Gran Capitan, s/n
08034 Barcelona, España
Tel. [phone]
________________________________________________________________

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