Function phyloprob::pct_of_bpp_and_upp_mat

pub fn pct_of_bpp_and_upp_mat(
    bpap_mats_with_rna_id_pairs: &Prob4dMatsWithRnaIdPairs, 
    rna_id: RnaId, 
    num_of_rnas: usize, 
    bpp_mat: &SparseProbMat, 
    upp_mat_len: usize
) -> (SparseProbMat, Probs)