Hello - Thank you so much for the help. It works perfectly. I guess that as many have pointed out, ggplot is a great package but there is a lack of documentation and examples.
Edwin Sun baptiste auguie-5 wrote: > > Hi, > > I don't understand why you used scale_manual_colour if you want only > black lines. To have different line types in the legend you can map > the linetype to the data, > > > huron <- data.frame(year=1875:1972, level=LakeHuron) > > ggplot(huron, aes(year)) + > geom_line(aes(y=level+5, linetype="above")) + > geom_line(aes(y=level-5, linetype="below")) + > scale_linetype_manual("offset", c(1, 2)) > > HTH, > > baptiste > 2009/12/1 Edwin Sun <c...@cfr.msstate.edu>: >> >> Hello All, >> >> I am trying to create a legend for a black-white graph. The package I use >> is >> ggplot2. It can add colors to the legend key but not line types. Can you >> please help? >> >> # example from Wickman (2009, ggplot2 – elegant graphics for data >> analysis, >> page 109) >> >> library(ggplot2) >> huron <- data.frame(year=1875:1972, level=LakeHuron) >> ggplot(huron, aes(year)) + >> geom_line(aes(y=level+5, colour="above")) + >> geom_line(aes(y=level-5, colour="below")) + >> scale_colour_manual("Direction", c("above"="black", "below"="black")) >> >> Thanks, >> >> >> Edwin >> >> Changyou Sun, Ph.D. >> Associate Professor >> Natural Resource Policy & Economics >> Box 9681, Department of Forestry >> Mississippi State University >> Mississippi State, MS 39762 >> >> #363 Thompson Hall >> (662) 325 7271 (ph), 325 8726 (fax) >> c...@cfr.msstate.edu >> www.cfr.msstate.edu/forestry >> -- >> View this message in context: >> http://n4.nabble.com/ggplot-legend-for-multiple-time-series-tp932430p932430.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> 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. >> > > ______________________________________________ > 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. > > -- View this message in context: http://n4.nabble.com/ggplot-legend-for-multiple-time-series-tp932430p932491.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.