Hello,
  I am a new user of R statistical project. So, I have a matrix (4 columns and 330 rows) and I would like to have PCA (Principal Component Analysis). Besides, I would like to draw every 30 rows from 330 with a different colour but I don’t know how.
  Could you help me by showing how can I draw every 30 rows with a different colour? 
  Thank you very much
Selim
 		
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