I found by looking up through Google that Travis O. has written a package called SparsePy for manipulating sparse arrays. However, when I tried to download it I was asked for a userid and password. Is this not yet publicly available? Are there any other packages for this that are available? -- Victor S. Miller | " ... Meanwhile, those of us who can compute can hardly victor@idaccr.org | be expected to keep writing papers saying 'I can do the CCR, Princeton, NJ | following useless calculation in 2 seconds', and indeed 08540 USA | what editor would publish them?" -- Oliver Atkin