Item Share Distribution — item_share_distribution • vennDiagramLab

Per-membership-count item totals.

Usage

item_share_distribution(matrix)

Arguments

matrix: Binary item \(\times\) set matrix.

Value

Named integer vector with names "1", "2", ..., "n_sets".

Details

Given a binary item \(\times\) set matrix (rows = items, columns = sets, cells in \(\{0, 1\}\)), returns a named integer vector keyed by k = 1..n_sets giving the number of items belonging to exactly k sets. All bins are present even when their count is zero. Rows that sum to zero are skipped (universe-rule violation; defensive).

Examples

m <- matrix(c(
  1, 0, 0,
  1, 1, 0,
  1, 1, 1
), ncol = 3, byrow = TRUE)
item_share_distribution(m)
#> 1 2 3 
#> 1 1 1