I'm currently creating some really large matrices, and hope they will end up reasonably sparse. I would like to toy with them in sage some day. Looking for a suitable standardized storage format, I just learned about the Harwell-Boeing Exchange Format. Is there some functionality provided by sage to read such files?
If not, should I rather read the file and construct a matrix from it using a standard matrix constructor, or should I create my own matrix subclass whith an internal format that closely resembles the file format?
