Hello,
See if this is it. The standard trick is to reshape the data from wide
to long, see the SO post [1]. Then add a scale_shape_* layer to the plot.
yyy <- cbind(xxx, y3 = y3)
long <- reshape2::melt(yyy, id.vars = c("x", "y1", "grp"))
ggplot(long, aes(x, y = value, colour = variable, shape = variable)) +
geom_line(aes(y = y1)) +
geom_point() +
scale_colour_manual("Doesn't work",values=c("blue","red"),
labels=c("clyde","irving")) +
scale_shape_manual("Doesn't work",values=c(16,3),
labels=c("clyde","irving")) +
facet_grid(cols=vars(grp))
[1]
https://stackoverflow.com/questions/2185252/reshaping-data-frame-from-wide-to-long-format
Hope this helps,
Rui Barradas
Às 00:04 de 01/12/19, Rolf Turner escreveu:
I have been struggling to add a legend as indicated in the subject line,
with no success at all. I find the help to be completely bewildering.
I have attached the code of what I have tried in the context of a simple
reproducible example.
I have also attached a pdf file of a plot produced with base graphics to
illustrate roughly what I am after.
I would be grateful if someone could point me in the right direction.
cheers,
Rolf Turner
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