Transform a vector of spans (with duplication) into a visibility vector

Usage

spans_to_viscell(spans)

Arguments

spans

(numeric)
a vector of spans, with each span value repeated for the cells it covers.

Value

A logical vector the same length as spans indicating whether the contents of a string vector with those spans is valid.

Details

The values of spans are assumed to be repeated such that each individual position covered by the span has the repeated value.

This means that each block of values in spans must be of a length at least equal to its value (i.e. two 2s, three 3s, etc).

This function correctly handles cases where two spans of the same size are next to each other; i.e., a block of four 2s represents two large cells each of which spans two individual cells.

Note

Currently no checking or enforcement is done to verify that the vector of spans is valid according to the specifications described in the Details section above.

Examples

spans_to_viscell(c(2, 2, 2, 2, 1, 3, 3, 3))
#> [1]  TRUE FALSE  TRUE FALSE  TRUE  TRUE FALSE FALSE