Change colours of particular bars in a bar chart

Question

I\'ve been creating some bar-charts and I was wondering is it possible to colour bars on a chart depending on whether they lie above or below the x-axis?

For clarifi

Answer 1

I found this page while looking for help on how to colour individual bars in a bar chart according to a factor. I couldn't find any other source of information but thanks to this page, came up with this:

cols <- ifelse(df$Country == "Greenland", "green","blue")

It then gets passed into barplot in the usual way as described above:

barplot(x, col = cols)