Hi:
It would really help to have a reproducible example to see exactly what
problems you're having, but here's a simple manufactured example to
illustrate how to produce a basic legend. The plot below is one with three
different 'y' variables against the same x. The x and y limits are made wide
enough to contain all the data with room for a legend.
# Fake data:
dd <- data.frame(x = 1:20, y1 = rnorm(20, 2, 1), y2 = rnorm(20, 4, 1),
y3 = rnorm(20, 6, 1))
summary(dd) # check the ranges of the y-variables first
plot(y1 ~ x, data = dd, type = 'l', xlim = c(0, 25), ylim = c(-1, 10))
lines(y2 ~ x, data = dd, lty = 'dotted')
lines(y3 ~ x, data = dd, lty = 'dashed')
lnames <- c('y1', 'y2', 'y3')
legend('topright', legend = lnames, lty = c('solid', 'dotted', 'dashed'))
If you want to increase the thickness of the legend lines to improve
visibility, use lwd, as in
legend('topleft', legend = lnames, lty = c('solid', 'dotted', 'dashed'), lty
= 2)
HTH,
Dennis
On Wed, Jul 21, 2010 at 9:06 PM, li li <hannah....@gmail.com> wrote:
> Hi all,
> I am have some difficulty with the legend function.
> I need to add a legend to describe the different line types in a plot. The
> legend box is small.
> It did not include sufficient length of each line type to help distinguish
> the differnt line types.
> Is there a way to fix this.
> Thank you
> Hannah
>
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>
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