* General matrix-vector product. (L2) Computes: Y := alpha*A*X + beta*Y, if trans is NoTrans Y := alpha*A^T*X + beta*Y, if trans is Trans Y := beta*Y, if n=0, m>0 and trans is NoTrans Y := beta*Y, if n>0, m=0 and trans is Trans The matrix A is m by n. Retu
(A, X, Y matrix.Matrix, alpha, beta matrix.Scalar, opts ...linalg.Option)
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