performs one of the matrix-vector operations y := alpha*A*x + beta*y, or y := alpha*A *x + beta*y, where alpha and beta are scalars, x and y are vectors and A is an

m by n matrix-performs one of the matrix-vector operati ons y : = alpha * A * x * y beta, or y : * A = alpha beta * x * y, where alpha and beta are scalars. x and y are vectors and A is an m by n matrix