[R] triangle.class pch per factor

[HighSchool2005]

Hello,

I am using triangle.class in ade4 package and a factor. I would like to use
this graphic parameter (pch) to set a different kind of point for each group
in my factor (lakes). I have tried pch=1:4, I guess it does what it is
supposed to do but not what I want. I can't use colors.

Thank you in advance, 
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