Best way to store a sparse matrix in .NET

Question

We have an application that stores a sparse matrix. This matrix has entries that mostly exist around the main diagonal of the matrix. I was wondering if there were any efficie

Answer 1

I think this could be done by using a class holding plain array, saving the horizontal offset applied between matrix rows and defining stripe of a row, e.g. the number of valid entries. So for a large matrix where only the diagonal and two neighbor elements are defined you'd create an array of 3 * number of rows and store 3 as the stripe width. The offset depends on the size of the matrix.

I'm not aware of anything free which already does this.