Extract a subset of the file set.
# S3 method for GenericDataFileSet
extract(this, files, ..., onMissing=c("NA", "error", "drop", "dropall"),
onDuplicates=c("ignore", "drop", "error"))Returns a GenericDataFileSet with zero of more
GenericDataFile:s.
An integer or a logical vector indicating which data files
to be extracted. Negative indices are excluded.
Not used.
A character specifying the action if a requested file
does not exist. If "error", an error is thrown. If "NA",
a GenericDataFile referring 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.
Henrik Bengtsson
na.omit for dropping missing files from a fileset.
For more information see GenericDataFileSet.