From:

Gus Gassmann <horand.gassmann@googlemail.com>

Newsgroups:

comp.lang.c++.moderated

Date:

Sat, 16 Oct 2010 14:26:43 CST

Message-ID:

<42b4c74a-77b5-46b2-88f8-2dc6ef049f97@l20g2000yqm.googlegroups.com>

example would be something like

class IndexValuePair

{

int dim;

int* index;

double* value;

}

class SparseMatrix

{

int numberOfColumns;

int* start;

IndexValuePair nonzeros;

}

In IndexValuePair, dim is the common size of the arrays index and

value; the array start in SparseMatrix has size numberOfColumns + 1.

I want to compare two sparse matrices. Two sparse matrices are equal

if they have the same number of columns, the start vectors match

component by component, and the IndexValuePairs are equal.

Two IndexValuePairs are equal if they have the same dimensions, the

components of index match one by one, and the components of value also

do.

(I know that strictly speaking I am allowed to reorder the indices

within a column, but I will and can assume that the indices are given

in ascending order within each column.)

Are there any library functions available that would let me do this?

Ideally I would like to be able to say

if (SparseMatrix1 == SparseMatrix2)...

or

if (equal(SparseMatrix1,SparseMatrix2)

I looked, but I have not been able to find anything useful.

(Be gentle, I am only a beginner...)

Thanks

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