This function converts a binary phylogenetic tree to sequential binary parition to be used to then build an ILR basis for compositional metagenomic data.
The choice of orientation for a balance (i.e., which of the two descendant clades of an internal node is in the numerator or denominator of the log-ratio) is given by the default of the function phangorn::Children and that choise is used consistently throughout the philr package.
a n by n-1 matrix of the sequential binary partition sign matrix
Schliep K.P. 2011. phangorn: phylogenetic analysis in R. Bioinformatics, 27(4) 592-593
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