[R] Plotting different symbols in R for different values in a vector

[clips10]

I have some point locations I want to add to a plot and have the command

pts1<-as.points(Xcoordinate,Ycoordinate)

then


plot(poly1,type="l",lwd=1)

what I want to do is add the locations onto the plot. I can do this using
the points command but I have another vector in my data frame with the x and
y coordinates called A for instance which takes values 1 and 0. I want to
plot the locations onto my plot and have a different symbol or colour
depending on whether this other vector takes the value 1 or 0. Is there
anyway to do this?

Thanks
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