On Friday, November 6, 2015 at 2:59:56 PM UTC-8, Andrey Novoseltsev wrote: > > My understanding is that (unlike for R) we do not try to do anything for > Octave plotting, so everything is "default". Plotting commands in Octave > use either gnuplot or OpenGL, but it seems that in our setup only gnuplot > is available. How extractly it is used I don't know, but my guess is that > Octave creates some input file and then passes it to "gnuplot" and you have > an option to change the name of the called binary and supply some options > to it. For whatever reason, default options result in just ASCII plot in > SageMathCell and SageNB. When I try to add explicit commands for saving in > a particular format I am just getting the same ASCII plot one more time and > some warnings. Starting Octave from a local terminal allows me to open > plots in a new window, while saving files works but still shows warning > about missing things. It would be nice if someone who knows Octave and > gnuplot figured out what do we need to do to get some plots and no warnings > - I am stopping for now. > > I don't know either very much, but I have succeeded on my local octave (on Fedora) to produce some plots in files via essentially this code:
https://sagecell.sagemath.org/?z=eJxLy0wvLUrVMNRRKssszkzKSVXSUcpPS1PS5OUqLi1K0yhITcwuBnESy1ITi0HqwCJ6BXnpIDUAiBwTdA==&lang=octave figure(1,"visible","off") surf(peaks) saveas(1,"peaks.png") (saving to peak.pdf works too). I did install "transfig" (a part of xfig), as well as "pstoedit". Turning the "visible" off ensures that you don't get the silly ascii art. Other remarks: I do need to run octave with "DISPLAY" unset. Otherwise it seems to want to use the graphics windows things, and from there any attempt to saving the graphics leads to a segfault [which has significantly diminished my trust in octave, or at least its fedora packaging]. Even with "visible" off, I wasn't getting saved graphics (but no segfaults either). It would be great if we could get basic octave graphics support running on sagecell. I think plenty of matlab-centric courses could make excellent use of it. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
