Facets-class {rsolr}

Facets

Description

The Facets object represents the result of a Solr facet operation and is typically obtained by calling facets on a SolrCore. Most users should just call aggregate or xtabs instead of directly manipulating Facets objects.

Details

Facets extends list and each node adds a grouping factor to the set defined by its ancestors. In other words, parent-child relationships represent interactions between factors. For example, x$a$b gets the node corresponding to the interaction of a and b.

In a single request to Solr, statistics may be calculated for multiple interactions, and they are stored as a data.frame at the corresponding node in the tree. To retrieve them, call the stats accessor, e.g., stats(x$a$b), or as.table for getting the counts as a table (Solr always computes the counts).

Accessors

• x$name, x[[i]]: Get the node that further groups by the named factor. The i argument can be a formula, where [[ will recursively extract the corresponding element.

• x[i]: Extract a new Facets object, restricted to the named groupings.

• stats(x): Gets the statistics at the current facet level.

Coercion

• as.table(x): Converts the current node to a table of conditional counts.

Author(s)

Michael Lawrence

See Also

aggregate for a simpler interface that computes statistics for only a single interaction