`x3_sym` — Exchangability matrix on triplets/codon constructed from nucleotide exchange rates

Usage

x3_sym(submodel: ExchangeModel<b>, a: a)
→ ExchangeModel<a>

Type constraints: Triplets<a,b>

submodel:: The singlet exchange model
a:: The Triplets alphabet; Default: The alphabet in the current context

Original default expressions

a

get_state(alphabet)

Exchangability matrix on triplets or codons constructed from an exchangability matrix on nucleotides.

Thus function can be used to build up triplet and codon models incrementally.

HKY85_sym +> x3_sym +> F +> dNdS      // equivalent to GY94

GTR_sym +> x3_sym +> F

x3_sym(HKY85_sym)