Re: Extracting contour values from ContourPlot

*To*: mathgroup at smc.vnet.net*Subject*: [mg100818] Re: Extracting contour values from ContourPlot*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Sun, 14 Jun 2009 21:21:25 -0400 (EDT)*References*: <h12gg4$ect$1@smc.vnet.net>

You can use the option ContourLabels -> All to label the contours. A legend such as in multiple-line plots doesn't make sense for contour plots as it would require every contour line to be distinct (with varying colors and/or dashing) which woulde be dead ugly. Cheers -- Sjoerd On Jun 14, 11:39 am, dg <davide.guari... at gmail.com> 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 n= umber > 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?