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bbmultqh Quick evaluation of BB'*X. bbmultqh(BB,X) computes the product BB'*X quickly, in the sense that it assumes any relevant checks have been completed in advance. bbmultqh is intended for evaluating matrix-matrix products inside a combining black-box routine. It is not recommended for normal use; please use bbmult instead. bbmultqh supports matrix-matrix products. If necessary, the product is evalated as a series of matrix-vector products. See also bbmultq, bbmult.