Extracts the invalid.votes member (if any) from the result of a count

This method was added Jan 2022 -- it was named in a warning message but had apparently either never been implemented, or had been "lost" through versioning.

Usage

invalid.votes(x)

Arguments

x

value returned by stv, condorcet, approval, plurality, or score

Value

matrix with one column per candidate and one row per invalid ballot