Is there any general rule of thumb that dictates when to use a full
matrix over a sparse matrix? any specific matrix density ?
Does matlab run much slower if store and operate on relatively dense
matrices as a sparse matrix?
Basically, I'm working with a matrix that is about 1/4 full. But all
the operators are one or a few times more dense than a diagonal
matrix. So I'm guessing that I should store the operators as sparse
matrices and have them operate on a full matrix. The matrix
dimensions are on the order of around 1000's x 1000's.