Dear R list users,
I have a data frame called catchment like

"year" "season" "rainfall" "colour"
1953 1 409.5 "black"
1953 2 145.3 "black"
1953 3 285.6 "red"
1953 4 275.0 "black"
1954 1 273.8 "black"
1954 2 342.8 "blue"
1954 3 167.6 "black"
1954 4 341.1 "black"
1955 1 182.3 "blue"
1955 2 211.8 "black"
1955 3 222.6 "black"
1955 4 522.1 "black"
1956 1 248.7 "red"
1956 2 244.9 "black"
...

and I would like to plot it with the colours specified in the column colour (at 
the moment the colours are three: black, red and blue. I would like to have the 
possibility to add oher colours to this list).
With

plot(catchment$year, catchment$rainfall, main="River Aso", xlab="years", 
ylab="mm", type="p", col=catchment$colour)

the colours displayed in the graph are not the ones I have chosen.
I looked for the answer, which probably involves a transformation to factor, 
but I am not able to understand well the solution.
Could somebody help me?

Thank you
Stefano Sofia


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