Feature request: arithmetic with correlation data frames

[jcberny]

Showing which correlations change between treatments would be of great use. Is there a way to subtract one correlation data frame of one treatment with the other treatment, and still be in a object class that corrr can plot?

[drsimonj]

This should be extended to accommodate any sort of matrix algebra that makes sense in the context of correlation data frames. For example, given two correlation data frames, r1 and r2, it'd be nice to be able to do the following while preserving the cor_df class:

r1 + r2

r1 - r2

r1 * r2

r1 / r2

Other considerations might be:

r1^2

[github-actions]

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