hi all,

suppose I have a file with several columns, and I want to plot all points
that meet a certain condition (i.e. all points in columns A and B that have
a value greater than such and such in column C of the data) in a new but
random color.  That is, I want all these points to be colored differently
but I dont care what color.  The only concern is that the points will be
colored as differently from each other as possible.

The specific example I have is a file with three columns, X, Y and ID.  I
want to plot all rows from X, Y (i.e. all points) that have the same value
(say 1) in their ID column as one color, all points from X, Y that have the
same ID column value (say 2) as a different color, etc.  I dont know ahead
of time how many values the ID column will have so I can't write a separate
plot statement for each of these sets of X, Y rows that have the same ID
value.

Is there a way to express this in R?

thank you.
Is there a way to do this?

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