Adding a general title to autoplot.lm
I'm plotting diagnostics plots for a regression model using autoplot. I would like to add a general single title for the graph.
As example:
library(ggfortify)
autoplot(lm(Petal.Width ~ Petal.Length, data = iris), label.size = 3)
I would like to place a "Title" at the top without modifying any subplot. Thanks in advance.
EDIT: I already tried grid.arrange() getting this error: Error in $<-(tmp, wrapvp, value = vp) : no method for assigning subsets of this S4 class.
Solution
You can directly reference the list of ggplot objects within the ggmultiplot object returned by ggfortify's autoplot.lm:
p <- autoplot(lm(Petal.Width ~ Petal.Length, data = iris), label.size = 3)
gridExtra::grid.arrange(grobs = p@plots, top = "some title")
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