The R data.
I have a data.table that is not very big (2 GB) but for some reason write.csv takes an extremely …
r file-io csv dataframe data.tableI'm having a little trouble understanding the pass-by-reference properties of data.table. Some operations seem to 'break' the reference, and …
r reference copy data.table assignment-operatorI have the following data.table x = structure(list(f1 = 1:3, f2 = 3:5), .Names = c("f1", "f2"), row.names = c(NA, -3…
r data.table mapplyI have a list of data frames with different sets of columns. I would like to combine them by rows …
r data.table rbindLet's say I have a data.table and I want to select all the rows where the variable x has …
r select subset data.tableThis is very similar to a question applying a common function to multiple columns of a data.table uning .SDcols …
r data.table subset lapplyI am looking for an efficient (both computer resource wise and learning/implementation wise) method to merge two larger (size&…
r merge dataframe plyr data.tableThis is a bit of a philosophical question about data.table join syntax. I am finding more and more uses …
r join data.tableWould someone please explain to me the correct usage of .I for returning the row numbers of a data.table? …
r data.tableI have a data.table with columns 2 through 20 as strings with spaces (e.g., "Species Name"). I want to run …
r apply data.table