statnet.common: compress_rows.data.frame – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

compress_rows.data.frame

"Compress" a data frame.

Description

compress_rows.data.frame "compresses" a data frame, returning unique rows and a tally of the number of times each row is repeated, as well as a permutation vector that can reconstruct the original data frame. decompress_rows.compressed_rows_df reconstructs the original data frame.

Usage

## S3 method for class 'data.frame'
compress_rows(x, ...)

## S3 method for class 'compressed_rows_df'
decompress_rows(x, ...)

Arguments

`x`	For `compress_rows.data.frame` a `data.frame` to be compressed. For `decompress_rows.compress_rows_df` a `list` as returned by `compress_rows.data.frame`.
`...`	Additional arguments, currently unused.

Value

For compress_rows.data.frame, a list with three elements:

`rows`	Unique rows of `x`
`frequencies`	A vector of the same length as the number or rows, giving the number of times the corresponding row is repeated
`ordering`	A vector such that if `c` is the compressed data frame, `c$rows[c$ordering,,drop=FALSE]` equals the original data frame, except for row names
`rownames`	Row names of `x`

For decompress_rows.compressed_rows_df, the original data frame.

Examples

(x <- data.frame(V1=sample.int(3,30,replace=TRUE),
                 V2=sample.int(2,30,replace=TRUE),
                 V3=sample.int(4,30,replace=TRUE)))

(c <- compress_rows(x))

stopifnot(all(decompress_rows(c)==x))

statnet.common

Common R Scripts and Utilities Used by the Statnet Project Software

v4.4.1

GPL-3 + file LICENSE

Authors

Pavel N. Krivitsky [aut, cre] (<https://orcid.org/0000-0002-9101-3362>), Skye Bender-deMoll [ctb]

Initial release

2020-10-03