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

*To*: mathgroup at smc.vnet.net*Subject*: [mg131966] Re: ListPlot - assigning a list of colors to a set of*From*: Gordon Robertson <grobertson at bcgsc.ca>*Date*: Wed, 6 Nov 2013 00:39:04 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net*References*: <20131105041619.448C769FC@smc.vnet.net>

Thanks Bob, Your solutions are compact. The code below extends your first example to use a long list of XY coordinates and colours in ListPlot. nbr = 1000 xy = Transpose[{RandomReal[{0, 1}, nbr], RandomReal[{0, 1}, nbr]}]; (* xy data to plot *) cols = Table[RandomChoice[{Red, Green, Blue}], {i, nbr}]; (* list of colors *) ListPlot[List /@ xy, PlotStyle -> (Directive[PointSize[0.02], Opacity[0.6], #] & /@ cols)] Gordon On 2013-11-05, at 8:34 AM, Bob Hanlon wrote: Make each point a separate data list and repeat the PointSize: ListPlot[List /@ {{1, 1}, {2, 2}, {3, 3}}, PlotStyle -> (Directive[PointSize[0.02], #] & /@ {Red, Green, Blue})] Although you can use a List instead of Directive: ListPlot[List /@ {{1, 1}, {2, 2}, {3, 3}}, PlotStyle -> ({PointSize[0.02], #} & /@ {Red, Green, Blue})] Alternatively, ListPlot[List /@ {{1, 1}, {2, 2}, {3, 3}}, PlotStyle -> {Red, Green, Blue}, PlotMarkers -> {Automatic, Medium}] Bob Hanlon On Mon, Nov 4, 2013 at 11:16 PM, Gordon Robertson <grobertson at bcgsc.ca<mailto:grobertson at bcgsc.ca>> 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/><http://www.bcgsc.ca<http://www.bcgsc.ca/>>

**References**:**ListPlot - assigning a list of colors to a set of points***From:*Gordon Robertson <grobertson@bcgsc.ca>