Thanks all for helping. Switch to gnuplot did generate correct figures.
Andy,
Here is my GPU:
01:00.0 VGA compatible controller: NVIDIA Corporation G73 [GeForce 7600 GT] (rev a1).
I do have issues with the nvidia driver which I think probably not related to this issue, which is sometimes my display freezes and cannot recover. Windows 8 seems to be able to idle and wait for the driver to restart but ubuntu will go into a black screen and error messages of "nouveau E[Xorg[1116]] failed to idle channel". I haven't found a solution and it does not happen too often.
If I move the plot out of screen it does not seem to redraw(maybe because of the workspaces?). If I try to change the size of the window, it seemed to have redrawn but still not showing correct results.
On Fri, Oct 17, 2014 at 12:25 AM, Andreas Weber <address@hidden> wrote:
Hi Jesse,
On 16.10.2014 20:57, Zexi Zhuang wrote:
> I just installed gnu octave 3.8.1 ubuntu 14.04 LTS from the
> softwarecenter with the options shown in the attached picture 2.02. The
> plot function is not showing any meaningful line or shapes.
Switching to gnuplot is an easy workaround but I would like to debug
this issue further. Can you tell us which GPU you are using?
"lspci |grep VGA" should list it
Could you also upload (for example to pastebin) the output of "glxinfo"
(it's in package mesa-utils)
If you move the plot window out of the screen and then back, so that it
needs a redraw, does the image change?
-- Andy