vis_dat
compare_print
is an internal function that takes creates a dataframe with
information about where there are differences in the dataframe. This
function is used in "vis_compare". It does a simple evaluation on the data
(df1 == df2) and (currently) replaces the "true" (the same) with "Same"
and FALSE with "Different", unless it is missing (coded as NA), in which
case it leaves it as NA.
compare_print(x)
a vector