[R] initiate elements in a dataframe with lists

Juan Telleria Ruiz de Aguirre jte||er|@@rproject @end|ng |rom gm@||@com
Wed Jul 25 11:56:05 CEST 2018

> Just for my understanding:
> Is a data.frame with list columns still a data.frame? Isn't it then a list?

* A data.frame (or tibble) is a list of columns.
* In which each column must be from the same data type, in this case list().

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