[R] PCA in predefined Groups??

[SHAFI]

Hi

This has a simple answer but it has been eluding me nonetheless. 

I have been trying to build a PCA plot from scratch with the ability to plot
predefined groups in different colors.  I can plot PCA but I want it to plot
with predefined groups(samples) with top 100 expressed genes. I have three
groups. Can any body help me keeping in mind that the user is just beginner
in R.

Thanks in advance

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