remove_chunk: Removes a chunk from the disk.frame

In xiaodaigh/disk.frame: Larger-than-RAM Disk-Based Data Manipulation Framework

Removes a chunk from the disk.frame

Description

Removes a chunk from the disk.frame

Usage

remove_chunk(df, chunk_id, full.names = FALSE)

Arguments

df	a disk.frame
chunk_id	the chunk ID of the chunk to remove. If it's a number then return number.fst
full.names	TRUE or FALSE. Defaults to FALSE. If true then chunk_id is the full path to the chunk otherwise it's the relative path

Examples

# TODO add these to tests
cars.df = as.disk.frame(cars, nchunks = 4)

# removes 3rd chunk
remove_chunk(cars.df, 3)
nchunks(cars.df) # 3

# removes 4th chunk
remove_chunk(cars.df, "4.fst")
nchunks(cars.df) # 3

# removes 2nd chunk
remove_chunk(cars.df, file.path(attr(cars.df, "path", exact=TRUE), "2.fst"), full.names = TRUE)
nchunks(cars.df) # 1

# clean up cars.df
delete(cars.df)

xiaodaigh/disk.frame documentation built on Feb. 3, 2023, 10:04 p.m.