dspmv

Perform the matrix-vector operation `y = alpha*A*x + beta*y` for a symmetric matrix `A` supplied in packed form.

Perform the matrix-vector operation `y = α*A*x + β*y` where `α` and `β` are scalars, `x` and `y` are `N` element vectors, and `A` is an `N` by `N` symmetric matrix supplied in packed form.