[ublas] REQ: sparse/compressed matrix: getting nonzero el.

From: Vento Neicapelli (lascoscazzato_at_[hidden])
Date: 2005-01-19 12:54:31

Dear uBlas users,

I start evaluating uBlas lib. Who know how to get the nonzero elements of a 
sparse_matrix (or compressed_matrix)? Is there an iterator?

suppose you have  this simple code:

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_sparse.hpp>
#include <boost/numeric/ublas/io.hpp>

int main () {
    using namespace boost::numeric::ublas;
    sparse_matrix<double> m (30, 30);

   //fill the matrix diagonal...
    for (unsigned i = 0; i < m.size1 (); i++)
        m(i,i) = 2*i+1;
.....

   // how to print only the non zero (on the diagonal)?

}

many Tnx!

   lasco

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