Follow Query Ranges — fast_follow • fastRanges

Return the index of the first subject range that is strictly before each query range.

Usage

fast_follow(
  query,
  subject,
  ignore_strand = FALSE,
  threads = fast_default_threads()
)

Arguments

query: An IRanges or GRanges query object.
subject: An IRanges or GRanges subject object.
ignore_strand: Logical scalar. Ignored for non-genomic ranges.
threads: Integer scalar thread count. Included for API consistency.

Value

Integer vector of subject indices, with NA for unmatched queries.

Details

For each query range, return the index of the first subject range that comes strictly before the query.

Examples

q <- IRanges::IRanges(start = c(1, 10, 20), width = c(5, 4, 3))
s <- IRanges::IRanges(start = c(3, 9, 18), width = c(4, 6, 5))
fast_follow(q, s)
#> [1] NA  1  2