On 07/25/2018 10:23 AM, Ivan Calandra wrote:
Just for my understanding:
Is a data.frame with list columns still a data.frame? Isn't it then a list?
A data.frame is a list of equally sized vectors - that is, each vector
must be of the same length. It is not required that the vector is an
atomic vector; it can be a list, too. By having equally sized vectors in
a list you can arrange the list in a two-dimensional matrix-like format,
append row names to them, and you get a data.frame.
Principally data.frame(x = 1:3, y = list(1:2, 1:3, 1:4)) should work,
but it doesn't, as it was recognized by others, too:
https://stackoverflow.com/questions/9547518/create-a-data-frame-where-a-column-is-a-list
Cheers,
Denes
Ivan
--
Dr. Ivan Calandra
TraCEr, laboratory for Traceology and Controlled Experiments
MONREPOS Archaeological Research Centre and
Museum for Human Behavioural Evolution
Schloss Monrepos
56567 Neuwied, Germany
+49 (0) 2631 9772-243
https://www.researchgate.net/profile/Ivan_Calandra
On 25/07/2018 09:56, Juan Telleria Ruiz de Aguirre wrote:
Check tidyverse's purrr package:
https://github.com/rstudio/cheatsheets/raw/master/purrr.pdf
In the second page of the cheatsheet there is info on how to create list
columns within a data.frame :)
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