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When attempting to print a plot to .png in Octave 3.8.1.1 on Windows 8 64-bit, the axes plot, but the line I'm plotting won't print. The plot I'm creating is:
> t = 0:0.1:6.28318;
> plot (t, sin(t));
> print figure.png
The resulting plot:
And the image saved to disk:
So the axes are showing up fine, but the line I've plotted is completely missing!
I have gs9.09 (win32) installed, with epstool win32 copied into gs's /bin directory, which is being set in my %HOMEPATH%\.octaverc as:
cmd_path = getenv ("path");
gs_path = 'C:\Programs\gs\gs9.09\bin';
if (isempty (strfind (cmd_path, gs_path)))
setenv ('path', strcat (cmd_path, pathsep (), gs_path));
endif
I am running the windows GUI version via w8-octave-gui.bat.
EDIT
On a fresh launch with the following commands to set gnuplot as the graphics toolkit before launching any plots (from @Andy's comments), I get a blank white image for all images without -dpngalpha (1, 2, 4, 5) and completely transparent images with no content for images with -dpngalpha (3, 6):
>> graphics_toolkit("gnuplot");
>> graphics_toolkit()
ans = gnuplot
>> t = 0:0.1:6.3;
>> plot(t,sin(t));
>> print ("1.png");
>> print ("-dpng", "2.png");
>> print ("-dpngalpha", "3.png");
>> axis("off");
>> print ("4.png");
>> print ("-dpng", "5.png");
>> print ("-dpngalpha", "6.png");
Halp!
578
To clear the current figure, call the clf function. To clear the current axis, call the cla function. To bring the current figure to the top of the window stack, call the shg function. To delete a graphics object, call delete on its index.
When plotting in Octave you plot points having their x -values stored in one vector and the y -values in another vector. The two vectors must be the same size. Octave inserts lines between the points. If you want a smoother graph, make a longer x -vector.
octave#:#> plot(x,y,'b--','linewidth',3) will plot x and y as a thick, blue, dashed line. The next example consists in plotting two different functions on the same axis. Specifically, we will plot the functions f1(x) = sin(x) and f2(x) = sin(x2) from x = 0 to x = 2π, using equally spaced points on the x-axis.
Looks like you've hit this bug: https://savannah.gnu.org/bugs/?42534
I know you answered to juliohm's comment that switching to gnuplot doesn't has an effect but I can't believe this. You have to execute
graphics_toolkit("gnuplot")
before any command which creates a plot figure. To be sure you can run "close all" before.
The reason for your problem is possibly that the line is printed behind the white background due to some rounding errors in the z-depth. Can you please try EDIT: these command when graphics_toolkit fltk is enabled (should be the case with a default install and a fresh start):
t = 0:0.1:6.28318;
plot (t, sin(t));
axis ("off");
print ("-dpngalpha", "out.png")
to verify this? This doesn't solve your problem but helps the Octave maintainers to find the problem.
85
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