Subject: Re: [R] is there a way to create legends automatically?
ben@zoo.ufl.edu
Date: Tue 24 Oct 2000 - 23:32:12 EST
Message-ID: <Pine.LNX.4.10.10010240922570.22944-100000@bolker.zoo.ufl.edu>
Can you be a little more specific about what you want to do?
To "automatically" create a legend you can write a small function that
plots your data and then generates a legend. An example is below: the
only slightly tricky thing is automatically generating the correct
placement of the legend. I've chosen here to put it in the upper
left-hand corner. It would be wonderful to be able to somehow know where
to put it that it wouldn't overlap any of the data, but short of expanding
the plot range beyond the range of the data I don't see that this is
possible to do automatically.
x <- as.data.frame(matrix(runif(200),ncol=5))
names(x) <- LETTERS[1:5]
plot.with.legend <- function(x,col=1:ncol(x),lty=1:ncol(x),...) {
## x should be a data frame with all numeric variables
matplot(1:nrow(x),x,col=col,lty=lty,type="l",...)
u <- par("usr")
## put an automatic legend in the upper left-hand corner of the plot
legend(u[1],u[4],names(x),col=col,lty=lty)
}
On Tue, 24 Oct 2000 Pan_Yuming@aam.de wrote:
> Hi all,
>
> when plotting mutiple data series, i need to specify how one data series
> should be plotted. that s fine, but can i let the program automatically
> create legends afterwards? thanks very much.
>
>
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