changing colours of the data points in a biplot

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CLARK KENDRICK GO 2019-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/456704-changing-colours-of-the-data-points-in-a-biplot

评论： Heidi Hirsh 2020-9-29

Suppose I have:

A = rand(100,5);
[coefs,score] = pca(A);
biplot(coefs(:,1:2),'Scores',score(:,1:2),'VarLabels',vbls);

There is a default size and colour of the data points that appear on the biplot.

I want to customise my own to show different aspects of my data. For example: I want the first 20 points to be green coloured, second 20, to be red, etc etc. How do I this?

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Adam 2019-4-16

在 MATLAB Online 中打开

You can use the

hPlots = biplot(coefs(:,1:2),'Scores',score(:,1:2),'VarLabels',vbls);

syntax to return the plot handles, although you get literally one handle per point on the graph so you get a large number of them that you would have to fish through and set the colours on. You can set lots of colours at a time with e.g.

set( hPlots, 'Color', 'b' )

or whatever, but you need to index only those plots you want and remove the various other lines and bits and bobs from your array of handles.

Heidi Hirsh 2020-9-29

Can someone elaborate on how to do the indexing to select a subset of the points? I've tried doing so and the data plots in different locations if I select a subset.

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