data frame with two columns. First column represents an index of a
group in the supplied encoding and the second column contains all elements of
the encoding.
Details
The encoding is a list of groups to which elements of an alphabet
should be reduced. All elements of the alphabet (all
amino acids or all nucleotides) should appear in the encoding.
See Also
calc_ed: calculate the encoding distance between two encodings.
encoding2df: converts an encoding to a data frame.
validate_encoding: validate a structure of an encoding.