Density Plots in R

Question

I am trying to make interactive density plots for my data in R. I am able to make a basic density plot for some simulated data:

library(plotly)
library(ggplot2)

a = rnorm(100,10,10)
b = plot(density(a))

b

Now, I am trying to make this an interactive plot. I tried the following line of code, but I get an empty plot:

ggplotly(b)

Therefore, I tried to replicate the original density plot "b" using the "ggplot2" library:

p <- ggplot(a, aes(x=a)) + 
    geom_density()

ggplotly(p)

This seems to work:

But at the same time I get an error:

Error: `data` must be a data frame, or other object coercible by `fortify()`, not a numeric vector

Can someone please explain why this error comes?

Thanks

Answer 1

Try this

a <- data.frame(a)
p <- ggplot(a, aes(x=a)) + 
     geom_density()
ggplotly(p)

Reasons for your error messages

1. The reason ggplotly(b) gives an error is that you need to give a ggplot object to ggplotly .

2.

a = rnorm(100,10,10) 
p <- ggplot(a, aes(x=a)) +  # does not work
    geom_density()

The reason you have an error for this because a is not a data.frame, it is a matrix.