here is a simple approach to, for instance, plot scores for PC1 and
PC2 using diff colors:
scores - prcomp(yourdata)$x
plot(scores[1:100,1], scores[1:100,2], pch = 20, col = blue)
points(scores[101:200,1], scores[101:200,2], pch = 20, col = red)
PM
On Sat, Sep 6, 2008 at 11:44 PM, pgseye [EMAIL
Hi,
I'm wanting to do a PCA on some data which is comprised of two different
groups (to see how well the groups are discriminated). Is there a way to
change the colour of the datapoints in a biplot so that I can easily see
which group is which (eg objects 1-100, red, 101-200, black).
Might be
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