Hi,
Using Fedora 21 and Octave 3.8.2 on a pc with nVidia video NV34 chipset, I want to do a simple plot: x = linspace(0, pi); plot(sin(2*x)); Instead of a sine plot, I get the result in the attachment. I got a similar result using Fedora 20 with same Octave version. Does this mean that Octave (or plot) doesn't support this video chipset anymore ? Thanks. _______________________________________________ Helpoctave mailing list [hidden email] https://lists.gnu.org/mailman/listinfo/helpoctave octaveplot.jpg (187K) Download Attachment 
Try to change graphics toolkit graphics_toolkit gnuplot, then plot. If problem persist report bug.

On 12/10/2014 03:20 PM,
vinukn wrote:
Thank you ...that works.Try to change graphics toolkit graphics_toolkit gnuplot, then plot. If problem persist report bug. _______________________________________________ Helpoctave mailing list [hidden email] https://lists.gnu.org/mailman/listinfo/helpoctave 
In reply to this post by hvn
On 10.12.2014 14:04, Huub wrote:
> Using Fedora 21 and Octave 3.8.2 on a pc with nVidia video NV34 chipset, > I want to do a simple plot: > x = linspace(0, pi); > plot(sin(2*x)); > Instead of a sine plot, I get the result in the attachment. I got a > similar result using Fedora 20 with same Octave version. Does this mean > that Octave (or plot) doesn't support this video chipset anymore ? The default graphics_toolkit is FLTK which uses OpenGL to draw plots. Is your OpenGL setup okay? Does "glxinfo  grep direct" show "direct rendering: Yes". Can you run "glxgears" without problems? What version is your libfltk? What happens if you move the window out of the screen and back again? Andy _______________________________________________ Helpoctave mailing list [hidden email] https://lists.gnu.org/mailman/listinfo/helpoctave 
Hi Andy,
Yes, it does.On 10.12.2014 14:04, Huub wrote:Using Fedora 21 and Octave 3.8.2 on a pc with nVidia video NV34 chipset, I want to do a simple plot: x = linspace(0, pi); plot(sin(2*x)); Instead of a sine plot, I get the result in the attachment. I got a similar result using Fedora 20 with same Octave version. Does this mean that Octave (or plot) doesn't support this video chipset anymore ?The default graphics_toolkit is FLTK which uses OpenGL to draw plots. Is your OpenGL setup okay? Does "glxinfo  grep direct" show "direct rendering: Yes". Yes, I can.Can you run "glxgears" without problems? find /usr name libfltk*What version is your libfltk? /usr/lib/libfltk_gl.so.1.3 /usr/lib/libfltk_images.so.1.3 /usr/lib/libfltk.so.1.3 /usr/lib/libfltk_forms.so.1.3 Stays the same, but as replied earlier: changing to gnuplot works.What happens if you move the window out of the screen and back again? _______________________________________________ Helpoctave mailing list [hidden email] https://lists.gnu.org/mailman/listinfo/helpoctave 
Hi Huub,
On 12.12.2014 11:34, Huub wrote: >> Is your OpenGL setup okay? Does "glxinfo  grep direct" show "direct >> rendering: Yes". > Yes, it does. >> Can you run "glxgears" without problems? > Yes, I can. >> What version is your libfltk? > find /usr name libfltk* > /usr/lib/libfltk_gl.so.1.3 > /usr/lib/libfltk_images.so.1.3 > /usr/lib/libfltk.so.1.3 > /usr/lib/libfltk_forms.so.1.3 >> What happens if you move the window out of the screen >> and back again? > Stays the same, but as replied earlier: changing to gnuplot works. The default graphics toolkit in 3.8.2 is the one which uses FLTK and this should work. Switching to gnuplot is only a workaround but we should nevertheless find the problem with fltk.  Andy _______________________________________________ Helpoctave mailing list [hidden email] https://lists.gnu.org/mailman/listinfo/helpoctave 
In reply to this post by hvn
Again one more test, does octave support qt graphicr handle? Type graphics_toolkit qt
again plot. Does it work? 
On 12/12/2014 03:34 PM, vinukn wrote:
I would say no:Again one more test, does octave support qt graphicr handle? Type graphics_toolkit qt again plot. Does it work? >> graphics_toolkit qt error: graphics_toolkit: qt toolkit is not available error: called from: error: /usr/share/octave/3.8.2/m/plot/util/graphics_toolkit.m at line 70, column 5 _______________________________________________ Helpoctave mailing list [hidden email] https://lists.gnu.org/mailman/listinfo/helpoctave 
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