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I am working on a project which plots points over a checkerboard (representing seats for people). I would like each pixel in the image to represent each integer matrix entry. After updating my Octave from $3.8$ to $4.2$, any image takes up $\frac 14$ of the actual plot window using the default OpenGL/ FLTK, as seen below.

The sample code:

clear

A = [1,2;3,4];

image(A)

axis xy %orients to bottom left

I need the purple to take up the entire plot window.

I can plot overtop the image using the line() function and I get:

OpenGL with Line plotted overtop

Now, if I enter graphics_toolkit("gnuplot") into the octave command window prior to running the code then I get the correct purple image taking up the entire plot window.

However, if I then use the line() function under gnuplot and plot the same line as before with

x=[0.5,2.5];
y=[1,1];
line(x,y,'color','red','linewidth',2)

the following bug appears:

multiplot> lot "-" binary format='%float64' record=2 using ($1):($2) axes x1y1 title "" with lines linestyle 10 ; ^ line 0: invalid command

and I get the following image:

Gnuplot with Line() function overtop

Does anyone know the issue? Thank you.

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  • $\begingroup$ Could you provide a screenshot of what it looks like? $\endgroup$
    – flawr
    May 5, 2017 at 20:14
  • $\begingroup$ @flawr The included image, the purple should take up the entire plot window $\endgroup$
    – marmar44
    May 9, 2017 at 18:53
  • $\begingroup$ I cannot reproduce your problem, when I try it the whole axis are filled. You can of course cut the axis using xlim([a,b]) and ylim([c,d]) or axis([a,b,c,d]). $\endgroup$
    – flawr
    May 9, 2017 at 19:09
  • $\begingroup$ Cutting the axis works for cutting the axis, then the resulting image takes up a quarter of the new window. If I enter graphics_toolkit("gnuplot") I get the entire axes to be filled with the purple squares like I want. However, if I use the line( ) function to plot a line overtop I get the following error: lot "-" binary format='%float64' record=2 using ($1):($2) axes x1y1 title "" with lines linestyle 10 ; ^ line 0: invalid command $\endgroup$
    – marmar44
    May 19, 2017 at 17:22
  • $\begingroup$ If I don't use gnuplot, and instead use OpenGL (which is the default), I get the same quarter plot image of purple but plotting overtop works. $\endgroup$
    – marmar44
    May 19, 2017 at 17:25

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