Warnings introduced by R 4.0 update

[bstaton1]

After updating to R 4.0, post_summ() (and other functions) return a warning about condition having length > 1 and only the first element will be used. This issue occurs on postpack version 0.2.3 (at least).

data(cjs, package = "postpack")
post_summ(cjs, "b")

Returns the output as expected, but also throws these warnings:

Warning messages:
1: In if (class(post_mat) == "numeric") { :
  the condition has length > 1 and only the first element will be used
2: In if (class(post_mat_sub) == "numeric") { :
  the condition has length > 1 and only the first element will be used
3: In if (class(post_mat_sub) == "numeric") { :
  the condition has length > 1 and only the first element will be used

[bstaton1]

After further digging, I've discovered that this is a result of the class() function call, which originates in matrix2mcmclist(). Evidently, now when you run:

m = matrix(c(1,1,1,1), 2, 2)
class(m)

You will get "matrix" "array". When this result is passed to if(), it will produce the warnings above. This behavior is documented in the R 4.0.0 release notes under "Significant User-Visible Changes" (bullet 2).

This will take a little bit of fixing to make sure the if() statements only respond to one logical element throughout all functions.