Computation failed in `stat_smooth()`: object '

Question

I am trying to add a geom_smooth() to a qplot() with the following code:

library(ggplot2)
library(ggplot2movies)
qplot(votes, rating, data = movies) + geom_smooth()

However, the smoother is missing from the plot. I also receive the following warning message:

Computation failed in stat_smooth(): object 'C_crspl' not found

Does anybody know what is wrong here?

This is my setup:

> sessionInfo()
R version 3.4.1 (2017-06-30)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.1 LTS

Answer 1

I also had this problem and almost gave up. However, when I simply reinstalled mgcv before and ggplot2 later, the script simply went back to working as before.

Answer 2

I had similar issues:

# `geom_smooth()` using method = 'gam' and formula 'y ~ s(x, bs = "cs")'
# Warning message:
# Computation failed in `stat_smooth()`:
# object 'C_crspl' not found 

and

# Warning message:
# Computation failed in `stat_smooth()`:
# object 'C_magic' not found  

when using geom_smooth(method="gam"). The problems vanished when I explicitly loaded the mgcv package version 1.8-17. I guess by default, ggplot (I use 2.2.1.9000) looked at 1.8-16, which was also in the search path. So you might want to update mgcv or make sure that the latest version is used.

Answer 3

I could not reproduce your problem: it works fine in my system. I guess you have a problem with some ggplot2 dependency. Try restarting your session and reinstall ggplot2.

If that doesn't work, test geom_smooth() with a different dataset and a different method, e.g. qplot(Sepal.Length, Sepal.Width, data = iris) + geom_smooth(method = 'lm')

Answer 4

I had the same exact issue. Tried loading mgcv explicitly and this did nothing. Since I originally relied on ggplot2 to install mgcv, I went back and installed mgcv myself so that the newest version was included and then re-installed ggplot2 and the issue went away. This is on Ubuntu 16.04 with ggplot2 2_2.2.1 and mgcv 1.8-23.