Dear Mark,
Thanks for you kind answer and good suggestion.
The matrix is a block one, having sparse blocks with a dimension of 5.
And about the scales, the numbers do go away, though they are important. In
fact, that is one of my serious problems about this system. Do you have any
recommend
If you zero a row out then put something on the diagonal.
And your matrix data file (it does not look like it has any sparsity
meta-data) has about 18 orders of scales. When you diagonally scale, which
most solvers implicitly do, it looks like some of these numbers will just
go away and you will n
