Hamming distance between two CDR3 sequences

Counts the number of positional mismatches between two equal-length amino acid sequences. Returns -1L if the sequences have different lengths.

Usage

hamming_distance(a, b)

Arguments

a

Character string. First CDR3 amino acid sequence.

b

Character string. Second CDR3 amino acid sequence.

Value

An integer: the number of mismatches, or -1L if lengths differ.

See also

hamming_matrix, weighted_cdr3_distance

Examples

hamming_distance("CASSI", "CASSK")  # 1
#> [1] 1
hamming_distance("CASSI", "CASSI")  # 0
#> [1] 0
hamming_distance("CASSI", "CASSILY")  # -1 (different lengths)
#> [1] -1