MATLAB: Scale data on a plot by opacity

opacityplot

Hi,

I have a set of data that is plotted, in 2D, as a bunch of points (a scatter plot). Each point also has an intensity associated with it. How can I plot the data such that the intensity is represented by shades of color?

I.e. currently I'm specifying the appearance of the points with 'ro' string, such that each point is a red dot. How do I change this to be scaled such that the most "intense" value is deep red, and the least intense values are grey?

I've seen this done before, so I know it's possible.

Thanks!

Best Answer

See Vary Circle Color in the scatter documentation.

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The current workaround for this is to use the 'o' marker symbol and divide its size to make it a similar size to the '.' marker symbol. This can be done by adding the following line to the code you sent in:

h = scatter(x, y, 'Marker', 'o', 'MarkerEdgeAlpha', 0.5);
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Plot function doesn't have support to tune transparency. You can use scatter to do that

scat = scatter(x,y,'MarkerFaceColor','b','MarkerEdgeColor','r'); 
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You can manipulate the color values, if you wish to use plot function.

hand = plot(X,Y,'r');
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Best Answer

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