Hi, I posted a question before about what it means to iterate over matrix, and was given an answer it means going over matrix rows (0...m-1).
That makes it, for exapmle, possible to create code like the following for ( (row, index) <- mxA.zipWithIndex ) row += something(index) however actual code in SparseMatrix iterates over hash of existing rows. That breaks this execution for SparseMatrix only in two senses : (1) not all rows are visited; only those that have non-zeros. In particular, if we created a matrix via like() then nothing is happening at all; (2) rows are not visited in order of indices. I would like to fix (1) and (2) problems in this iterator but not sure if this is important elsewhere.
