crunch (version 1.3.2)

dataset-extract: Subset datasets and extract variables

Description

Subset datasets and extract variables

Usage

## S3 method for class 'CrunchDataset,ANY':
[(x, i, j, ..., drop = TRUE)
## S3 method for class 'CrunchDataset,character':
[(x, i, j, ..., drop = TRUE)
## S3 method for class 'CrunchDataset,missing':
[(x, i, j, ..., drop = FALSE)
## S3 method for class 'CrunchDataset,ANY':
[[(x, i, ..., drop = FALSE)
## S3 method for class 'CrunchDataset,character':
[[(x, i, ..., drop = FALSE)
## S3 method for class 'CrunchDataset':
$(x, name)

Arguments

x

a CrunchDataset

i

if character, identifies variables to extract based on their aliases (by default, i.e. when x's useAlias is TRUE); if numeric or logical, extracts variables accordingly. Note that this is the as.list extraction, columns of the dataset rather

j

column extraction, as described above

...

additional arguments

drop

logical: autmatically simplify a 1-column Dataset to a Variable? Default is FALSE, and the TRUE option is in fact not implemented.

name

like i but for $

Value

• [ yields a Dataset; [[ and $ return a Variable