NewSmithWatermanGotoh returns a new Smith-Waterman-Gotoh string metric.

MatchMismatch represents a substitution function which returns the match or mismatch value depeding on the equality of the compared characters.

SmithWatermanGotoh represents the Smith-Waterman-Gotoh metric for measuring the similarity between sequences.

Substitution represents a substitution function which is used to calculate a score for character substitutions.