Re: Mathematica v6: Slower in the following fields
- To: mathgroup at smc.vnet.net
- Subject: [mg75793] Re: Mathematica v6: Slower in the following fields
- From: Guy lamouche <noemail at noemail.com>
- Date: Thu, 10 May 2007 05:25:47 -0400 (EDT)
- References: <f1s1fa$fbo$1@smc.vnet.net>
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.
Example:
aa=Table[RandomReal[] ,{i,1.,1000.},{j,1.,1000.}];
Graphics[Raster[aa,{{-10,-10.},{10.,10.}},{Min[aa],Max[aa]},
ColorFunction->"BlueGreenYellow"],ImageSize->500,Frame->True]
Guy Lamouche
"alexxx.magni at gmail.com" <alexxx.magni at gmail.com> wrote in news:f1s1fa
$fbo$1 at smc.vnet.net:
> 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
>
>
>