On Tue, Sep 21, 2010 at 21:20, Daniel Langr <daniel.langr at gmail.com> wrote: > Certainly true, but the time for computing matrix elements will take much > more time than the assembly process. To say truth we don't know yet how > much, because new method for computing Hamiltonian are still being > developed. Within competing methods this takes about 20 to 30 percent of the > time of the iterative eigensolver run, which is not neglectable. If not > stored, the elements would need to be evaluated multiple times.
I can't guarantee it for your particular problem, but it is exceedingly rare that loading the matrix from disk is cheaper than recomputing it. Jed
