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filling under the curve with the stat function option #1528

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skanskan opened this Issue Jan 28, 2016 · 2 comments

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skanskan commented Jan 28, 2016

I would like to create a graph with the normal function from x=-2 to x=2 filled red under the curve from -2 to 0 and blue from 0 to 2.

I've tried
ggplot(NULL,aes(x=c(-2,2))) + geom_area(aes(x=c(-2,0)),stat="function", fun=dnorm, fill="red") +
geom_area(aes(x=c(0,2)),stat="function", fun=dnorm, fill="blue")

But it doesn't work as expected.
I know I could do it creating a x vector and a y vector of points and later using subset....
but how can I achieve it with the "stat" option?
I think it doesn't work, when you add a new area it doesn't respect whatever you did before.

I've also tried with the xmin and xmax option, without success.

It would also be nice to be able to specify two stat functions o values, one for ymax one for ymin, in order to easily paint the are between two curves.

Regards.

@hadley hadley closed this in ae1abff Jan 31, 2016

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hadley commented Jan 31, 2016

Here's a quick fix:

ggplot(NULL, aes(c(-2,2))) + 
  geom_area(stat = "function", fun = dnorm, fill = "red", xlim = c(-2, 0)) +
  geom_area(stat = "function", fun = dnorm, fill = "blue", xlim = c(0, 2))
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skanskan commented Jan 31, 2016

Great, thank you.
I've also figured out that I can mix it with the option "fill = NA" to leave some curves without shading.

Why do you need the first "c(-2,2)"?
Instead of specifying many geom_area sentences, it would be nice to use a single geom_area and define the fill and xlim subregions through a vector or list.

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