Hello,
You must put the NA in scale_fill_manual. Like this:
ggplot(data = ddf, aes(x = x, y = y)) +
geom_area(aes(fill = fill)) +
geom_line() +
scale_fill_manual(values = c(NA, "red"))
Note also that 'fill' is a factor, were it numeric you would need fill =
factor(fill).
ddf2 <- data.frame(x,y,fill = as.integer(fill == "red"))
ggplot(data = ddf2, aes(x = x, y = y)) +
geom_area(aes(fill = fill)) +
geom_line() +
scale_fill_manual(values = c(NA, "red"))
#Error: Continuous value supplied to discrete scale
Just change to fill = factor(fill) and the graph is exactly the same.
Which leads me to propose an easier way of creating the vector 'fill',
in the first place.
fill <- as.integer((5 < x) & (x < 7.5))
Will give the same result, coerce to factor if you like.
Hope this helps,
Rui Barradas
Às 17:13 de 11/08/19, Troels Ring escreveu:
Dear friends - I have 2 problems with ggplot2
Here is the code for illustration
x <- seq(1,10,length=10000)
y <- x^2
fill <- rep(0,length(x))
fill[(5<x)&(x<7.5)] <- "red"
ddf <- data.frame(x,y,fill)
ggplot(data=ddf,aes(x=x,y=y)) + geom_area(aes(fill=fill)) + geom_line()
First the embarrassing one: I would really like no fill except from x from 5
to 7.5 or transparency so the background is still visible. Have tried NULL
and NA with no effect.
The other thing is that it appears that above the blue area some of the
other color spills true - reddish on my system.
Windows 10
R version 3.6.1
All best wishes
Troels Ring
Aalborg, Denmark
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