Re: [R] grouping similar column values into a single row

See ?tapply > tapply(paste(DF$col2), DF$col1, c) $`mir-1` [1] "aaa" "abc" "aac" $`mir-2` [1] "abb" "aaa" $`mir-3` [1] "cag" "ccc" "aaa" > # or > t(t(tapply(paste(DF$col2), DF$col1, paste, collapse = " "))) [,1] mir-1 "aaa abc aac" mir-2 "abb aaa" mir-3 "cag ccc aaa" > # or > t(do.call(cb

[R] grouping similar column values into a single row

Hi, I have a following situation with data: col1 col2 mir-1 aaa mir-1 abc mir-1 aac mir-2 abb mir-2 aaa mir-3 cag mir-3 ccc mir-3 aaa I want to have output in this format: col1 col2 mir-1 aaa, abc, aac mir-2 abb, aaa mir-3 cag,ccc,aaa I have sorted column 1 so that the grouping could be p