r - Split a column of a data frame to multiple columns -


i'd take data of form

before = data.frame(attr = c(1,30,4,6), type=c('foo_and_bar','foo_and_bar_2'))   attr          type 1    1   foo_and_bar 2   30 foo_and_bar_2 3    4   foo_and_bar 4    6 foo_and_bar_2

and use split() on column "type" above this:

  attr type_1 type_2 1    1    foo    bar 2   30    foo  bar_2 3    4    foo    bar 4    6    foo  bar_2

i came unbelievably complex involving form of apply worked, i've since misplaced that. seemed far complicated best way. can use strsplit below, unclear how 2 columns in data frame.

> strsplit(as.character(before$type),'_and_') [[1]] [1] "foo" "bar"  [[2]] [1] "foo"   "bar_2"  [[3]] [1] "foo" "bar"  [[4]] [1] "foo"   "bar_2"

thanks pointers. i've not quite groked r lists yet.

use stringr::str_split_fixed

library(stringr) str_split_fixed(before$type, "_and_", 2)

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