ListContourPlot memory problems?

Question

I have a simple 3d dataset (size 7035 x 3, I put it on my site if you want to check) which I want to plot with ListContourPlot:

x = Import["http://www.inrim.it/~magni/a.dat"];
ListContourPlot[x, PlotRange -> {All, {0, 6}}]

... and so far so good. But the x scale must - for various reasons - be rescaled, so I did this:

ListContourPlot[x /. {H_, f_, s_} -> {H*80, f, s}, PlotRange -> {All, {0, 6}}]

and M is unable to complete: after some seconds it exits without errors, and I discover the kernel has quit!

Kernel crash reproduced in Dell Latitude E6520 2.4GHz 8Gb RAM, Windows 7 SP1 64 bit, Mathematica 9.0.1.0. — rhermans, Apr 01 '14 at 12:36
Try using the option Method -> {"DelaunayDomainScaling" -> True} (see this) — Simon Woods, Apr 01 '14 at 12:56
thank you Simon, that worked - though it's really slow compared with the unscaled plot. BTW, I'm on v9.0.1, Linux — alessandro, Apr 01 '14 at 13:06

score 1 · Answer 1 · answered Apr 02 '14 at 16:26

This may be not a direct answer to your question, and you can try to use GeometricTransformation

x = Import["http://www.inrim.it/~magni/a.dat"];
g= ListContourPlot[x, PlotRange -> {All, {0, 6}}]
Graphics[GeometricTransformation[g[[1]], ScalingTransform[{80, 1}]], 
   AspectRatio -> 1, Axes -> True, PlotRange -> {All, {0, 6}}]

ListContourPlot memory problems?

1 Answers1