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Re: Extracting contour values from ContourPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100808] Re: Extracting contour values from ContourPlot
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Sun, 14 Jun 2009 21:19:33 -0400 (EDT)
  • References: <h12gg4$ect$1@smc.vnet.net>

Hi,

plt = ContourPlot[Cos[x*y], {x, -Pi, Pi}, {y, -Pi, Pi}];

and

Cases[plt, _Tooltip, Infinity] /. Tooltip[_, lbl_] :> lbl

?

Regards
   Jens

dg wrote:
> I have spent an hour researching this group and online, with no
> definitive answer.
> 
> The problem: I have an nxm matrix of z values that I want to plot with
> List(Contour|Density)Plot together with a legend that shows the
> *actual* values of the contours used in the plot. (Seems like a pretty
> basic thing to me....). I know how to draw a nice legend, that's not
> the problem.
> 
> I have found a way to do it: I can specify the contours and plot range
> explicitly. But what I really want is not to have to do this, and rely
> on the semi-intelligent mechanism of Mathematica to pick an appropriate number
> of contours and their values, THEN use those to draw the legend.
> 
> It seems that there is no way to do this. That is, there is no way to
> extract the actual contour values used in the plot. I found a
> ColorBarPlot package which however does not work in Mathematica 7:
>   <http://library.wolfram.com/infocenter/MathSource/7030/>
> 
> Is it really not possible to do
> this?
> 


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