ggplot2: can't change axis.title.y angle with position = 'right'

Question

Here's a basic plot:

ggplot(data.frame(x=1:10,y=1:10), aes(x,y)) +
  geom_point() +
  theme_linedraw()

If I want the y axis label not to be rotated, i can do that like this:

ggplot(data.frame(x=1:10,y=1:10), aes(x,y)) +
  geom_point() +
  theme_linedraw() +
  theme(axis.title.y = 
          element_text(color='red', angle=0, vjust = 0.5))

And if I want it on the right side, I can do that like this:

ggplot(data.frame(x=1:10,y=1:10), aes(x,y)) +
  geom_point() +
  theme_linedraw() +
  scale_y_continuous(position = 'right')

But why can't I do both?

ggplot(data.frame(x=1:10,y=1:10), aes(x,y)) +
  geom_point() +
  theme_linedraw() +
  scale_y_continuous(position = 'right') +
  theme(axis.title.y = 
          element_text(color='red', angle=0, vjust = 0.5))

For reference:

> sessionInfo()
R version 3.3.3 (2017-03-06)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X El Capitan 10.11.6

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets 
[6] methods   base     

other attached packages:
[1] magrittr_1.5  ggplot2_2.2.1

loaded via a namespace (and not attached):
 [1] labeling_0.3     colorspace_1.2-6 scales_0.4.1    
 [4] lazyeval_0.2.0   plyr_1.8.4       tools_3.3.3     
 [7] gtable_0.2.0     tibble_1.3.4     yaml_2.1.13     
[10] Rcpp_0.12.12.5   grid_3.3.3       digest_0.6.12   
[13] rlang_0.1.2      munsell_0.4.3 

Answer 1

ggplot2::theme has left and right options for applicable components. So you can use axis.title.y.right.

Strange that you need to explicitly specify right when axis.title.y colours both left and right as you say in your comments, good spotting!

library(ggplot2)
ggplot(data.frame(x=1:10,y=1:10), aes(x,y)) +
  geom_point() +
  theme_linedraw() +
  scale_y_continuous(position = 'right') +
  theme(axis.title.y.right = element_text(color='red', angle=0, vjust = 0.5))