crunch (version 1.7.3)

dataset-extract: Subset datasets and extract variables

Description

Subset datasets and extract variables

Usage

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

As with a data.frame, there are two cases: (1) if no other arguments are supplied (i.e x[i]), i provides for as.list extraction: columns of the dataset rather than rows. If character, identifies variable

j

columnar 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

columnar extraction for $

Value

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