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MathGroup Archive 2007

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Re: Mathematica v6: Slower in the following fields

  • To: mathgroup at
  • Subject: [mg75793] Re: Mathematica v6: Slower in the following fields
  • From: Guy lamouche <noemail at>
  • Date: Thu, 10 May 2007 05:25:47 -0400 (EDT)
  • References: <f1s1fa$fbo$>

ListDensityPlot is behaving way much different than before. If you have a 
large image, it is indeed very slow (but very nice when done!!!!). I 
faced the same problem. I don't need the interpolation feature since my 
images are usually very large. I ended up using Graphics[Raster[]]. If 
you play around with the options (and I must admit that the new help 
system is more pleasant to play with in that regard), you can get a good 
speed. Avoid ArrayPlot and MatrixPlot for large datasets, Graphics[Raster
[]] is way much faster.

aa=Table[RandomReal[] ,{i,1.,1000.},{j,1.,1000.}];

Guy Lamouche

"alexxx.magni at" <alexxx.magni at> wrote in news:f1s1fa
$fbo$1 at

> I installed v6, but had to return to 5.2 since  - for some works I was
> doing - the new version has become unacceptably slow. Now I changed my
> mind and I keep both versions on, depending on what I have to do.
> I'd like to start this thread to see people post their observations
> about what has become slower in v6 - and of course what is faster too!
> e.g. some posts ago I saw somebody having problems with eigenvalues
> calculations.
> My problems, just to start, relate to graphics. Dealing with large
> images with ListContourPlot, for example, is really slower (had to
> kill the calculation). And ListDensityPlot is barely acceptable.
> So... please, add your experience here!
> Alessandro Magni

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