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 > > >