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Dot product of simple triplet matrix x (m x n) (measurement matrix) and a dense array y (n x k x l). Only slices of y_ from lsel vector are used.
mm_xpf(x, y_, lsel)
An array with dimensions (m x len(lsel) x k), i.e. it is permuted on the fly.
A list, sparse matrix of type slam
A numeric 3d array
An integer vector