forecast v7 & ggplot2 graphics adding fitted line to autoplot

Question

I was looking through a tutorial by Rob J Hyndman, here's the link for the tutorial, my question is how can i add a fitted line to the forecast plot eg;

library(forecast)
library(ggplot2)
fc <- forecast(fdeaths)
autoplot(fc)

I now need to add fitted(fc)to the plot above, how do I do it?

Answer 1

Here an other solution without additional packages:

fit <- data.frame(data=as.matrix(fitted(fc)), date=time(fitted(fc)))
autoplot(fc) + geom_line(data = fit,aes(date,data), col = "red")

You transform your ts into a data frame where you can use normal ggplot command. You can then just add the line. I realized that my solution work if the package ggfortify is not loaded