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I am trying to plot some 2D data using ListContourPlot. The quantity to be plotted has only three discrete values 0, 1, 2. While plotting them, I want to assign these numbers some labels say A, B, C, D to be shown as legends. The extra label D (four labels for three values) is added because the other data set I want to plot and compare with present data set has four variables (0, 1, 2, 3) and I want the color code to remain same. I created the legends separately and Legended it with the Plot, as in the following working example. Now, I am facing two problems.

  1. How to fix a numerical value to a particular label, say 0 for A, 1 for B etc. The problem is that for different data sets, same color is assigned to different labels/numerical value !!
  2. In this working example, there are only three values 0, 1 and 2, so I should see only three colors, but I see more. How is it possible ?

Will appreciate any help on this.

XX = {{0., 0., 0}, {0.149508, 0.076178, 0}, {0.153488, 0.0498713, 
    0}, {0.156435, 0., 0}, {0.302952, 0.0984348, 0}, {0.309017, 0., 
    0}, {0.444473, 0.144418, 1}, {0.451668, 0.0715374, 1}, {0.453991, 
    0., 0}, {0.574342, 0.186615, 1}, {0.584501, 0.0925761, 
    0}, {0.587786, 0., 0}, {0.689152, 0.223919, 2}, {0.702713, 
    0.111299, 1}, {0.707107, 0., 0}};
plot = ListContourPlot[XX, ColorFunction -> "RedBlueTones"];
labels = { "A" , "B", "C", "D" };
legend = SwatchLegend["RedBlueTones", labels, 
   LegendMarkerSize -> {{20, 20}}];
Legended[plot, legend]
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    $\begingroup$ Try the option Contours->{0,1,2} $\endgroup$ – Ulrich Neumann Oct 19 at 14:36
  • $\begingroup$ Thanks. I tried, and number of colors reduced. Also, how to assign a label to a number ? $\endgroup$ – user49535 Oct 19 at 15:02
  • $\begingroup$ This is a strange use case for a contour plot... $\endgroup$ – C. E. Oct 19 at 20:04
  • $\begingroup$ Could there be any alternative ? $\endgroup$ – user49535 Oct 20 at 7:54

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