[R] Highlighting different series with colors

[Michael A. Miller]

>>>>> "Valentin" == Valentin Bellassen <vbella at lsce.ipsl.fr> writes:

    > Hello, I have a data frame with 3 vectors $x, $y, and
    > $type. I would like to plot $x~$y and having different
    > colors for the corresponding points, one for each level of
    > $type. Would someone know how to do that? Is it possible to
    > then generate a legend automatically?

If type is a factor, you can use it as.numeric:
plot(x ~ y, data, col=as.numeric(type))
legend(..., col=as.numeric(data$type))

Mike