Thank you both for the suggestions. That worked great djmuse.
djmuseR wrote > Hi: > > Here's a way you could do it entirely within ggplot2. The annotation > functions have a parse = argument which allows you to pass character > string representations of math expressions, but there is no such thing > in the scale functions, so you need a different approach. > > library(ggplot2) > df <- data.frame(vis=c(0,0,1,1) , count=c(10,15,20,10) , grp=c(0,1,0,1)) > > # Generate a list of expressions that will become the legend labels > lbs <- list(expression(x <= 10), expression(x > 10)) > > ggplot(df, aes(x = factor(vis), y=count , fill=factor(grp))) + > geom_bar(stat ="identity") + > scale_fill_manual(breaks = levels(factor(df$grp)), > values = c("blue", "orange"), > labels = lbs) > > The specifications in scale_fill_manual() are: > - breaks: the values to go on the horizontal axis > - values: the vector of fill colors for each level of grp > - labels: the legend labels > Notice that the labels = takes a list of expressions as its argument. > This approach gives you more control over the legend and choice of > fill colors at the expense of a couple of lines of code. To change the > axis and legend titles, one can use the labs() function; e.g., > > last_plot() + labs(x = "Visibility", y = "Frequency", fill = "Threshold") > > Dennis > > On Thu, Mar 28, 2013 at 2:22 PM, soon yi < > soon.yi@ > > wrote: >> Hi >> >> I am trying to add a less than equal sign to a plot. I have previously >> done >> this using unicode but is not working in this instance. Any suggestions >> would be great >> >> thanks >> >> example code: >> >> library(ggplot2) >> df<-data.frame(vis=c(0,0,1,1) , count=c(10,15,20,10) , grp=c(0,1,0,1)) >> df$grp <-factor(df$grp ,levels=c(0,1) , labels =c("x \u2265 10" , "x > >> 10")) >> ggplot(df, aes(x = factor(vis), y=count , fill=grp)) + geom_bar(stat = >> "identity") >> >> >> >> >> -- >> View this message in context: >> http://r.789695.n4.nabble.com/ggplot2-less-than-equal-sign-tp4662784.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> > R-help@ > 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@ > 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://r.789695.n4.nabble.com/ggplot2-less-than-equal-sign-tp4662784p4662789.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.