CODEWITHSUNDEEP
matlabcolorsplotdata-visualizationscatter
Phil Straus
Phil Straus

Reputation: 11

display of data in meaningful color in Matlab scatter plots

I have about 9000 x,y locations, each with a value, say between -1 and 1. Let's call it a temperature.

I would like to plot each point with red/blue proportional to the point's temperature.

I can scale the values, in RGB, from [0 0 1] to [1 0 0] with G=0, and R+B=1. I want to the coldest points, with temperature -1, to be plotted with [0 0 1], pure blue, a mid-level point might be at [.4 0 .6], and a very hot point would be at [.95 0 .5]

I think there's a way to do this with the scatter command, but I can't figure out how to give a different RGB value to each point. If there's a way to do this with a plot command, I'd be happy to do that instead.

I'd appreciate any guidance you can give me.

Thank you,

Phil

Upvotes: 1

Views: 2831

Answers (1)

tmpearce
tmpearce

Reputation: 12693

Use the cdata property:

cdata = [0 0 0;
         1 0 0;
         0 1 0;
         0 0 1;
         1 0 1];
figure;
scatter(1:5, 1:5, 'o','cdata',cdata)

Upvotes: 2

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