Subj : Re: Matrix Operation
To   : borland.public.cpp.borlandcpp
From :  Bruce Salzman
Date : Fri Apr 22 2005 03:17 pm

> How can I store a two dimension matrix efficiently? Is there a
> better alternate for the following?
>
> double** data;
>
> data = new double* [rows];
>
> for (unsigned i = 0; i < rows; i++)
>  data[i] = new double[columns];
>

One example is the sparse matrix (one with lots of zero elements).
http://www.nist.gov/dads/HTML/sparsematrix.html

Boost has an implementation:
http://www.boost.org/libs/numeric/ublas/doc/matrix_sparse.htm

--
Bruce

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