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ListPlot - assigning a list of colors to a set of points

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131939] ListPlot - assigning a list of colors to a set of points
  • From: Gordon Robertson <grobertson at bcgsc.ca>
  • Date: Mon, 4 Nov 2013 23:16:19 -0500 (EST)
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I'm using Mathematica v9.x on a Mac, with OS X 10.7.5.

Could I ask about something that likely has a very simple solution? I have a list of XY coordinates for say 500 points that will become a scatterplot via ListPlot. I need to assign a colour to each point, using a list of labels (histology, risk, =85).

I've generated ArrayPlot graphics for cases like this for some time. For example, given some labels in column 4 of a 'hist' table:
colours = Table[{
    Switch[name = hist[[i, 4]],
     "Classical", Green, "Tall cell", Red, "Other", Blue]
    }, {i, Length[hist]}];
 ArrayPlot[{colours}, AspectRatio -> 0.1, Frame -> False]

For a ListPlot, I'd have thought that something as simple as dropping a list of colours into a PlotStyle Directive would do the job. But the following line plots three blue points, rather than a Red, Green and Blue point.
ListPlot[{{1, 1}, {2, 2}, {3, 3}},
 PlotStyle -> Directive[PointSize[0.02], {Red, Green, Blue}]]

Is there a simple way to declare a list of colours in ListPlot? I've looked through the PlotStyle documentation, and apologize if I've missed seeing how to do this.

Thanks very much for your help.

Gordon
--
Gordon Robertson
Michael Smith Genome Sciences Centre
BC Cancer Agency
Vancouver BC Canada
www.bcgsc.ca<http://www.bcgsc.ca>
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