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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131958] Re: ListPlot - assigning a list of colors to a set of points
  • From: Helen Read <readhpr at gmail.com>
  • Date: Wed, 6 Nov 2013 00:36:23 -0500 (EST)
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Make each point a sublist (i.e, enclose in an extra set of braces).

ListPlot[{{{1, 1}}, {{2, 2}}, {{3, 3}}},
  PlotStyle -> {{PointSize[0.02], Red}, {PointSize[0.02],
     Green}, {PointSize[0.02], Blue}}]

Helen Read
University of Vermont

On 11/4/2013 11:10 PM, Gordon Robertson wrote:
> 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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