ff (version 2.2-14)

chunk.bit: Chunk bit vectors

Description

chunking method for ffdf objects automatically considering RAM requirements from recordsize as calculated from sum(.rambytes[vmode])

Usage

# S3 method for bit
chunk(x, RECORDBYTES = .rambytes["logical"], BATCHBYTES = getOption("ffbatchbytes"), …)

Arguments

x

bit

RECORDBYTES

optional integer scalar representing the bytes needed to process a single element of the bit vector

BATCHBYTES

integer scalar limiting the number of bytes to be processed in one chunk, default from getOption("ffbatchbytes"), see also .rambytes

…

further arguments passed to chunk

Value

A list with ri indexes each representing one chunk

See Also

chunk, bit

Examples

# NOT RUN {
  n <- 1000
  x <- bit(n)
  ceiling(n / (300 %/% sum(.rambytes["logical"])))
  chunk(x, BATCHBYTES=300)
  ceiling((n/2) / (100 %/% sum(.rambytes["logical"])))
  chunk(x, from=1, to = n/2, BATCHBYTES=100)
  rm(x, n)

# }

Run the code above in your browser using DataCamp Workspace