When I try to make a dense matrix, I get a "MemoryError: out of memory allocating a matrix." I was able to output my matrix into a .txt file and tweak it to be read into Matlab. Matlab was able to compute it pretty quickly, so I feel like it is doable in Sage as well. Maybe I have a problem with my code? I'm unsure how to fix this problem.
On Apr 9, 12:00 pm, William Stein <wst...@gmail.com> wrote: > On Friday, April 9, 2010, Leo Maloney <leo.b.malo...@gmail.com> wrote: > > My Matrix consists of zeros ones, and -1/9s, so I was intially > > computing it over Q. I'm trying to re-run the program over R in hopes > > that it will use approximations rather than try to explicitly state > > the fractions. I am using a Macintosh OSX with 4 gigs of ram, it > > seems that this should be sufficient. > > Definitely try doing it with a dense matrix over QQ too; it might be > possible, though the answer will be big. If you provide me the > matrix I could try on my 128gb computer... I also know the matrix > inversion code over QQ well, since I wrote some of it. > > > > > > > On Apr 9, 11:03 am, Robert Bradshaw <rober...@math.washington.edu> > > wrote: > >> On Apr 9, 2010, at 10:53 AM, Leo Maloney wrote: > > >> > I'm trying to compute the inverse of a 5000 x 5000 sparse matrix. > > >> What is the basering? > > >> > I'm getting an EOF error after it runs for about 5 hours, and then it > >> > states that sage is trying to access unallocated memory. Is there a > >> > way I can increase the memory for this computation? Every time I > >> > Google it, all I can find is the benefits sage(plant) has on memory. > > >> What operating system are you on. Are you using Sage in a VM (on > >> Windows)? If so, you can increase the amount of memory allocated to > >> the virtual machine. Otherwise, have you checked to see if you even > >> have any memory left on your computer when doing the computation? > >> (Perhaps the only way to increase the memory is to buy more RAM or run > >> it on a different computer.) > > >> - Robert > > > -- > > To post to this group, send email to sage-support@googlegroups.com > > To unsubscribe from this group, send email to > > sage-support+unsubscr...@googlegroups.com > > For more options, visit this group > > athttp://groups.google.com/group/sage-support > > URL:http://www.sagemath.org > > > To unsubscribe, reply using "remove me" as the subject. > > -- > William Stein > Associate Professor of Mathematics > University of Washingtonhttp://wstein.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
