Why this command in ggplot is returning an error?

Question

I'm learning ggplot2 and I don't understand why this doesn't work :

p <- ggplot(diamonds, aes(x = carat))
p <- p + layer(
     geom = "point",
     stat = "identity"
)
p
Error in as.environment(where) : 'where' is missing

Do you know why?

mme · Accepted Answer · 2013-06-25 17:22:09Z

7

I think the problem is that you haven't specified what to use for the y-values. ggplot2 doesn't have the same default as the base graphics for plotting points against their index values. To use geom_point() with stat="identity" you'd need something like:

p<-ggplot(diamonds, aes(x=carat, y=cut))
p+layer(geom="point", stat="identity")

or more commonly

p+geom_point(stat="identity")

or however else you want try to plot your data.

answered Jun 25, 2013 at 17:22

mme

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Comments

Justin · Accepted Answer · 2013-06-25 15:57:52Z

2

Generally you don't use layer to build up a plot. Instead, you use geom or stat. p + geom_point() will plot what you're looking for. I'd suggest working through some of the examples in the gplot2 documentation.

answered Jun 25, 2013 at 15:57

Justin

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2 Comments

Wicelo Over a year ago

right but by using layer I just wanted to understand what exactly are geom and stat and how they interact

Justin Over a year ago

Moving your data and aesthetics into the layer call gives you a proto object back, but I don't know what to do with it: layer(data=diamons, aes(x=caret), geom='point', stat='identity'). However, stat='identity' is rather redundant here.

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