Get file id from sets.

Get the file id from file-sets given the type of relation between sets. File-set is defined by the case or filecategory.

getFileIdsSets(set = c("case", "filecategory"), relation = c("union", "intersect"))

Arguments

set	type of set, either "case" or "filecategory".
relation	relation between sets, either "union" or "interset".

Details

File-set is defined by case or file category. Files belonging to a case/filecategory are in a set. This function gets file id from the selected sets. When multiple sets are selected, the relation between them can be defined. When relation is union, file ids from either selected set are returned. When relation is intersect, only file ids that appear in all the selected sets are returned.

Value

A numeric vector or NULL if no file id is well-defined.

Author

HUANG Ronggui

See also

retrieval, getFileIds