On Fri, 18 Jul 2014 07:07:04 AM Stefano Sofia wrote: > 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$colour) > the colours displayed in the graph are not the ones I have chosen. > I looked for the answer, which probably involves a transformation to factor, > but I am not able to understand well the solution. Could somebody help me? > > Thank you > Stefano Sofia > Hi Stefano, Try this:
plot(catchment$year, catchment$rainfall, main="River Aso", xlab="years", ylab="mm", type="p", col=as.character(catchment$colour)) Jim ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
