[R] R plotting

[Mubar]

Hi

I have a question regarding plots in R. I have data from the S&P 500 in the
format:

date           close     change
1980-01-07  109.92   3.4

I plotted the data with plot(spdata$date, log(spdata$close), type="p")

Now I want to ad the colors green and red to the data frame. if the change
is positive it should be green, if negative, red. Also the colors should be
in the plot. I tried to do this with the ifelse function, but seem to be
stuck.

Can anyone help me with this?

Thanks a lot!




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