[R] find points on a graph

[aoife]

Hey guys, Can anyone help?

I did a correspondance analysis and made a plot. 

I also have a specific list of nodes that i want to find in my plot and want
to either color the nodes that appear in my list differently, or put some
kind of border around that group of nodes...

Would anyone know how to do this?

Also, would this post be more relevant here or in the bioconductor forum?


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