Create a lexicographic index descriptor

Usage

lexicographicIndex(columns, name)

Arguments

columns: List of column names
name: Name to give the created lexicographic index; used when querying the GTable after it has been closed.

Value

a list that can be used as an index descriptor when calling newDXGTable

Description

Creates a lexicographic index descriptor describing which column(s) are to be used to create the index.

Examples

lexicographicIndex(list("quality"), "qualityIndex")
$name
[1] "qualityIndex"

$type
[1] "lexicographic"

$columns
$columns[[1]]
[1] "quality"



lexicographicIndex(list("quality", "othercol"), "multiColIndex")
$name
[1] "multiColIndex"

$type
[1] "lexicographic"

$columns
$columns[[1]]
[1] "quality"

$columns[[2]]
[1] "othercol"

See also

newDXGTable, lexicographicQuery