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The following functions convert between sparse matrices and normal
(dense-representation) matrices.
Matrix(A) : MtrxSprs -> Mtrx
Given a sparse matrix A, return the
normal (dense-representation) matrix equal to A.
This function should only be used if the size of A is reasonably
small since otherwise the amount of memory needed to represent the
dense-representation matrix may be huge.
Printing the result of this operation is a convenient way to
display A as a normal (dense) matrix if A is small.
Given a normal (dense-representation) matrix A, return the sparse
matrix equal to A. Note that if there is a fast algorithm
available for the sparse matrix type, there is no need to
convert a dense-representation matrix to the sparse matrix type first
and then to use that algorithm, since Magma does this automatically.
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