Unique rows with multiple comma separated entries in R [duplicate]

Answer 1

Here's a dplyr solution, which IHMO is the most readable:

library(dplyr)

x %>%
  group_by(SNP) %>%
  summarize(
    genes = paste(gene, collapse = ','),
    hu_mRNA = paste(hu_mRNA, collapse = ',')
  )

The result:

Source: local data frame [5 x 3]

             SNP            genes             hu_mRNA
          (fctr)            (chr)               (chr)
1 chr1.111642529      H3F3A,H3F3B NM_002107,NM_005324
2 chr1.111801684                         BC098118
3 chr1.111925084             GJC2           NM_020435
4  chr1.11801605    ,C13orf33  AK027740,NM_032849
5 chr1.151220354 PCDHGA10,PCDHGA5 NM_018913,NM_018918