Off topic:R Plot: Plotting range of negative and positive values in different color

Question

[Anushka]

Hello all,

This could be a trivial query but I am very new to R. I have data in two columns (Col X and ColY). Column X has ONLY positive values while Column Y has both positive and negative values. I would like to plot X vs Y, but with certain given ranges of negative and positive values of Y, in different colors. For example my data is like:

X          Y
5.89558    5.79116
4.83266    2.66533
5.21103    1.42206
3.83974    -7.67948
4.47855    -8.95710
4.66096    -3.32192
9.77715    -2.03952
8.17131    -5.11321
4.86396    -1.72792

I would like to plot value of negative subset of Y ranging from (< 0 to -4) in one color (say red) and the subset positive values of Y ranging between (>0 to 4) in green. And rest of the values in Grey.

I would really appreciate help in defining conditional subset in R and plotting them in different colors.

Thanks