Commit 2b79efa7 authored by Quentin Read's avatar Quentin Read
Browse files

ts barrett's functions to nest and unnest data.tables

parent 62a90776
# Define function to nest DT by group, and unnest.
# these functions were written by TS Barrett in a document available at
group_nest_dt <-function(dt, ..., .key = "data"){
by <-substitute(list(...))
dt <- dt[, list(list(.SD)), by = eval(by)]
setnames(dt, old = "V1", new = .key)
unnest_dt <-function(dt, col, id){
by <-substitute(id)
col <-substitute(unlist(col, recursive = FALSE))
dt[, eval(col), by = eval(by)]
\ No newline at end of file
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