Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2007
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

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
> 
> 
> 


  • Prev by Date: Re: Reading coordinates from a 2D Plot
  • Next by Date: Re: Re: Eigenvalues in Mathematica 6.0.0 are
  • Previous by thread: Re: Mathematica v6: Slower in the following fields
  • Next by thread: How to get sqrt(Year^2)===Year?