`x2` — Rate matrix on doublets constructed from nucleotide rates

Usage

x2(submodel: CTMC<b>, a: Doublets<a>) → CTMC<Doublets<a>>

Type constraints: Nucleotides<a>

submodel:: Nucleotide rates
a:: The Doublets alphabet; Default: The alphabet in the current context

Original default expressions

a

get_state(alphabet)

Rate matrix on doublets, constructed from a rate matrix on nucleotides.

Thus function can be used to build up doublet models incrementally.

F81 +> x2

GTR +> x2