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MathGroup Archive 2007

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RE: listdensityplot, black box?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74853] RE: [mg74828] listdensityplot, black box?
  • From: "David Annetts" <davidannetts at aapt.net.au>
  • Date: Sun, 8 Apr 2007 05:06:50 -0400 (EDT)
  • References: <200704070801.EAA21593@smc.vnet.net>

Hi Alessandro,

> I have a rectangular grid of data (249x400) in the simple 
> form of values 0/1, e.g:
> {{1, 1, 0, ......, 1, 1, 1, 0, 0, 0, 0}, ... } I read them with
> 
> - lab=Import["...image.pbm"]
> 
> - lab2 = lab[[1, 1]]
> 
> and Show[Graphics[Raster[lab2]]] shows the image OK.
> 
> Now, whenever I do:
> 
> - ListDensityPlot[lab2]
> 
> I get no errors, but a completely black plot - of the correct 
> size 249x400, however.
> 
> I played a little with ColorFunction and ColorOutput, but it 
> didnt help.
> 
> Do you have any idea what I'm doing wrong???

It's actually working fine, you just need to turn the mesh, which by default
is on, off.

	dat = Random[Integer, {0, 1}] & /@ Range[249 * 400];
	dat = Partition[dat, 249];
	ListDensityPlot[dat, AspectRatio -> (249/400), Mesh -> False];

Regards,

Dave.


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