Re: Very slow ploting with gnu plot (windows)

[Jake]

I can confirm this; plotting under Windows, *regardless of the size*, takes 
about 30 seconds for the window to come up. After the first plot, the plot 
window will reappear quickly.

On Thu, 22 Nov 2012 09:57:21 -0500
Ben Abbott <address@hidden> wrote:

> 
> On Nov 22, 2012, at 5:09 AM, Matej Froebe wrote:
> 
> > Hi,
> > 
> > I have a problem with gnuplot under Octave 3.6.2 (Windows, pre-compiled
> > versions of Octave-3.6.2 for Microsoft Visual Studio).
> > 
> > Ploting of large Data with gnuplot takes apoximately four times as long as
> > it did with version 3.2.4 (installation file
> > Octave-3.2.4_i686-pc-mingw32_gcc-4.4.0_setup.exe).
> > 
> > For example:
> > 
> > testVect=rand(500000, 1);
> > plot(testVect)
> > 
> > 
> > In version 3.6.2 this example takes about 40s and in version 3.2.4 about
> > 12s.
> 
> Octave 3.6.2 switched to using ghostscript to convert from eps to bitmapped 
> formats.  This *may* be the cause of the slow down you are experiencing.  You 
> can confirm by timing "print test.eps" and "print test.png" and them compare 
> the differences.
> 
>       close all
>       graphics_toolkit gnuplot
>       plot (rand (3))
>       tic ()
>       print test.eps
>       gnuplot_eps = toc ()
>       tic ()
>       print test.png
>       gnuplot_png = toc ()
> 
>       close all
>       graphics_toolkit fltk
>       plot (rand (3))
>       tic ()
>       print test.eps
>       fltk_eps = toc ()
>       tic ()
>       print test.png
>       fltk_png = toc ()
> 
> Please run this script and let us know what the result is.
> 
> > Ploting with other graphics toolkits is much faster, but there are problems
> > with converting of plots to images.
> 
> 
> Ghostscript is used for both the gnuplot and fltk backends.  So there should 
> be no difference in the ability to produces images for these two toolkits.  
> If there is a difference in how long it takes to print, the problem will be 
> with producing the eps-file.
> 
> Printing using the "qt" toolkit is not yet supported.
> 
> Ben
> 
> 
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