ggplot: density plot error

Question

I am trying to plot some density plots overlaid on each other using ggplot

ggplot(den2, aes(x = V1,y=V2, fill = lines)) + geom_density()

However I'm getting this error: Error in if (nrow(layer_data) == 0) return() : argument is of length zero

Thanks!!

This post looks like it has some useful information for you. As the answerer said, the key point is that a density plot is a univariate thing, so you do it for one variable at a time (but possibly with grouping). — ulfelder
– ulfelder, Commented Jul 26, 2015 at 20:57

Rorschach · Accepted Answer · 2015-07-26 20:54:13Z

1

Try this

ggplot(den2, aes(x=V1, y=V2, fill=factor(lines))) + geom_polygon(alpha=0.5)

For 1-D density plots, you just supply one variable, like you would to a histogram. So, you could do something like this instead,

ggplot(den2, aes(x=V1, fill=factor(lines))) + geom_density(alpha=0.5)

answered Jul 26, 2015 at 20:54

Rorschach

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