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Re: Silent plot(x,y) (3.2 or later bug?)


From: Tatsuro MATSUOKA
Subject: Re: Silent plot(x,y) (3.2 or later bug?)
Date: Fri, 16 Oct 2009 09:32:30 +0900 (JST)

Hello

Please try

x=[0:1];
for i=[0:100]
 plot(x,x*i);
 filename=sprintf("%02d.png",i);
 drawnow('png',filename);
end

The above works on octave 3.0.5 (mingw).

However, it does not work on octave 3.2.2 (mingw), 3.3.50+ (mingw) and octave 
3.2.3(cygwin)
error: get: unknown property "__pixels_per_inch__"
error: called from:
error:   
C:\Programs\Octave\3.2.2_gcc-4.3.0\share\octave\3.2.2\m\plot\gnuplot_drawnow.m 
at line 190,
column 14
error:   
C:\Programs\Octave\3.2.2_gcc-4.3.0\share\octave\3.2.2\m\plot\gnuplot_drawnow.m 
at line 74,
column 7

The error message is for octave 3.2.2 (mingw) but that for octave 3.2.3 on 
cygwin is almost the same. 

Regards

Tatsuro

--- Karol Krizka wrote:

> Hi there,
> 
> I'm wondering if it is possible to plot a graph without displaying
> anything to the file. Basically, I'm trying to do an animated graph by
> plotting them step by step (suggested here:
> http://www.nabble.com/Displaying-an-animation---%22movie%22-td4199665.html
> ) and saving each graph as a file.
> 
> In summary, I have the following script:
> x=[0:1];
> for i=[0:1000]
>  plot(x,x*i);
>  filename=sprintf("%02d.png",i);
>  print(filename);
> end
> 
> The problem is that plot command displays the graph to the screen, and
> I think that it might be slowing (I show more than than 1000 frames..)
> down my script. Is there a way to suppress/silent the plot() command?
> 
> I'm using octave 3.0.5 from the Ubuntu Karmic repositories.
> 
> After some googling, I found the following suggestion:
> gset term postscript eps color
> gset output "name.eps"
> 
> But:
> octave:1> gset term postscript eps color
> parse error:
> 
>   syntax error
> 
> >>> gset term postscript eps color
>              ^
> 
> octave:1> gset output "name.eps"
> parse error:
> 
>   syntax error
> 
> >>> gset output "name.eps"
>                ^
> Any suggestions? Am I missing some package?
> --
> Cheers,
> Karol Krizka
> _______________________________________________
> Help-octave mailing list
> address@hidden
> https://www-old.cae.wisc.edu/mailman/listinfo/help-octave
> 


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