Minimum Left Endpoint

Returns the smallest left endpoint (start) currently present.

Usage

min_endpoint(x)

Arguments

x

An interval_index.

Value

Minimum left endpoint, or NULL when x is empty.

Details

Because intervals are stored in start order, this reads the first entry's start.

Examples

ix <- interval_index("a", "b", start = c(3, 1), end = c(4, 2))
min_endpoint(ix)
#> [1] 1
min_endpoint(interval_index())
#> NULL