[R] Customizing plot

[Mahmood Naderan-Tahan]

Hi,

1- How can I assign different colors to different observations in the PCA chart? Assume, I have 10 observations and I want to use black color for the first 5 and read for the next 5 observations.

Currently, I use


 res.pca = PCA(mydata[,1:37], scale.unit=TRUE, graph=T)

 plot(res.pca,axes=c(1,2))


2- How can I change the plot area size and font sizes? With these commands

 dev.new(width=20, height=4)
 plot(res.pca,axes=c(1,2))

The final plot is not what I expected. Please see the picture at https://imgur.com/UINTnv7


Regards,
Mahmood

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