phyloToricQuads(T,M)
phyloToricQuads(n,E,M)
The quadratic invariants are also referred to as the edge invariants of the model.
Each Fourier coordinate corresponds to a consistent coloring of the edges of tree T. For any given internal edge e of T, the consistent colorings can be obtained by coloring two smaller graphs and gluing them along e. This corresponds to a fiber product on the corresponding toric varieties. The quadratic invariants naturally arise from this process by gluing a pair of colorings of one small graph to a pair of colorings of the other small graph in two different ways.
The optional argument QRing can be passed the ring of Fourier coordinates. Otherwise the function will create a new ring.
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The object phyloToricQuads is a method function with options.