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SparseMatrix(R, A) : Rng, MtrxSprs -> MtrxSprs
Given a sparse matrix A over a ring S having m rows and n columns,
and another ring R, return the m x n sparse matrix over R obtained
by coercing the entries of A from S into R.
The argument order
to ChangeRing(A, R) here is consistent with other forms of ChangeRing, while the SparseMatrix(R, A) form of this function is
provided to be consistent with the sparse matrix creation functions above, for
which the destination ring is the first argument, if supplied.
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