unlist_df3: Unlist the columns in a data.frame, with more checks and adf
Description
Sometimes, matrices or data.frames will malfunction due
to their having lists as columns and other weirdness.
This runs unlist and additional
checks, and forces conversion to a
data.frame at the end.
Usage
unlist_df3(df)
Arguments
df
matrix or other object transformable to
data.frame