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MathGroup Archive 2001

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inverting y axis in DensityPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27271] inverting y axis in DensityPlot
  • From: Matthias Hertel <wir95cgu at studserv.uni-leipzig.de>
  • Date: Fri, 16 Feb 2001 03:58:21 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,

I would like to display the design matrix of a medium-sized general
least-squares problem as a bitmap. (It's too large for StandardForm or
MatrixForm to be useful, yet its structure is simple enough that one
can tell if something has gone really wrong just by looking at a
DensityPlot.)

    ListDensityPlot[desmtx, Mesh->False]

almost does what I want, but the matrix is displayed upside down
(desmtx[[1,1]] is in the *bottom* left corner).

    ListDensityPlot[Reverse@desmtx, Mesh->False]

is closer, but now the frame tick marks are wrong (don't correspond to
the row index). It would be perfect if there was something like

    ListDensityPlot[desmtx, InvertY->True, Mesh->False]

that's just like a normal ListDensityPlot but with the y axis flipped.
But there isn't.

So, how can I get a DensityPlot with (0, 0) in the top left corner and
y increasing downwards?

Thanks
Matthias


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