Feature request: column and row sums in plot_confusion_matrix

[MaraAlexeev]

For plot_confusion_matrix() it would be useful to have additional sums/% feature available in the plot function as below.

[LudvigOlsen]

I did actually consider this previously but never got around to it.
It would probably be a horizontal bar underneath and a vertical bar to the right with the counts and percentages.

Something similar to this:

from https://github.com/wcipriano/pretty-print-confusion-matrix

I would probably just have a single percentage though, as the row/col percentages already give the information that the two percentages in this plot gives.

[LudvigOlsen]

@MaraAlexeev
I've been playing around with this for a couple of hours now and this is what I've got so far:

Still have a lot of work to do on it, but this is the kind of design I'm thinking. What do you think?

[MaraAlexeev]

This looks great.

[LudvigOlsen]

I merged the functionality to the master branch, so you can try it out.
There's a new add_sums argument to enable. The appearance of the sum tiles can be changed in the sums_settings argument, using the sum_tile_settings() function.

Install with:
devtools::install_github("LudvigOlsen/cvms")