R help - Mar 2012 - PCA in predefined Groups??

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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Without taking away all the fun of trial and error, and exploration in R... I
will direct you to this website which I found invaluable when I first began
to use R. 

one way would be to use:
plot(Yourdata, type="n")
and then 3 text() or points() statements to plot the groups represented by
different colors.

Good luck!


SHAFI wrote
> 
> 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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View this message in context:
http://r.789695.n4.nabble.com/PCA-in-predefined-Groups-tp4462536p4462765.html
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