Apparently accessing a df column via df[[colname]] flies fine in other OS, but you need one pair of brackets in Linux. (Still not actually sure why this didn't get flagged by Travis-CI in the many previous iterations of running tests we've done, but oh well)
Apparently accessing a df column via df[[colname]] flies fine in other OS, but you need one pair of brackets in Linux. (Still not actually sure why this didn't get flagged by Travis-CI in the many previous iterations of running tests we've done, but oh well)