Visiting all entries of Sparse Matrix in the org.apache.commons.math.linear package

Question

Hi,

I see 2 implementations of sparse matrix in this package.

1. OpenMapRealMatrix
2. SparseFieldMatrix

Both are documented as "Sparse matrix implementation based on an open addressed map".

Do you know what are the diffrences between the two? also, what's the best way to iterate over all entries in a fast way (which means, iterating over the non zero elements).

Thanks!