R: Extract a subset of the file set

extract.GenericDataFileSet {R.filesets} | R Documentation

## Extract a subset of the file set

### Description

Extract a subset of the file set.

### Usage

    ## S3 method for class 'GenericDataFileSet'
    extract(this, files, ..., onMissing=c("NA", "error", "drop", "dropall"),
      onDuplicates=c("ignore", "drop", "error"))

### Arguments

`files` | An `integer` or a `logical` `vector` indicating which data files to be extracted. Negative indices are excluded.
`...` | Not used.
`onMissing` | A `character` specifying the action if a requested file does not exist. If `"error"`, an error is thrown. If `"NA"`, a `GenericDataFile` refering to an `NA` pathname is used in place. If `"drop"`, the missing file is dropped. If `"dropall"`, an empty data set is return if one or more missing files are requested.

### Value

Returns a `GenericDataFileSet` with zero of more `GenericDataFile`:s.

### Author(s)

Henrik Bengtsson

### See Also

`na.omit` for dropping missing files from a fileset. For more information see `GenericDataFileSet`.

[Package R.filesets version 2.11.0 Index]