Split delimited strings in a column and insert as new rows [duplicate]

Answer 1

Now you can use tidyr 0.5.0's separate_rows is in place of strsplit + unnest.

For example:

library(tidyr)
(df <- read.table(textConnection("1|a,b,c\n2|a,c\n3|b,d\n4|e,f"), header = F, sep = "|", stringsAsFactors = F))

  V1    V2
1  1 a,b,c
2  2   a,c
3  3   b,d
4  4   e,f

separate_rows(df, V2)

Gives:

  V1 V2
1  1  a
2  1  b
3  1  c
4  2  a
5  2  c
6  3  b
7  3  d
8  4  e
9  4  f

See reference: https://blog.rstudio.org/2016/06/13/tidyr-0-5-0/