# Function for chunked range index creates a sequence of range indexes using a syntax not completely unlike 'seq' ```r chunks( from = NULL, to = NULL, by = NULL, length.out = NULL, along.with = NULL, overlap = 0L, method = c("bbatch", "seq"), maxindex = NA ) ``` ## Arguments - `from`: the starting value of the sequence. - `to`: the (maximal) end value of the sequence. - `by`: increment of the sequence - `length.out`: desired length of the sequence. - `along.with`: take the length from the length of this argument. - `overlap`: number of values to overlap (will lower the starting value of the sequence, the first range becomes smaller - `method`: default 'bbatch' will try to balance the chunk size, see `bbatch`, 'seq' will create chunks like `seq` - `maxindex`: passed to `ri` ## Returns returns a named list of `ri` objects representing chunks of subscripts ## Examples ```r chunks(1, 100, by=30) chunks(1, 100, by=30, method="seq") ## Not run: require(foreach) m <- 10000 k <- 1000 n <- m*k message("Four ways to loop from 1 to n. Slowest foreach to fastest chunk is 1700:1 on a dual core notebook with 3GB RAM\n") z <- 0L; print(k*system.time({it <- icount(m); foreach (i = it) %do% { z <- i; NULL }})) z z <- 0L print(system.time({i <- 0L; while (i

chunks function