On Sunday, April 11, 2010, Leo Maloney <leo.b.malo...@gmail.com> wrote: > 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.
Do you want a floating point answer or an exact rational answer? Matlab will not give you a correct exact rational answer (it will appeat to in a certain mode but will in fact return nonsense). > > 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 > -- William Stein Associate Professor of Mathematics University of Washington http://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
