# scipy.optimize.LbfgsInvHessProduct.rmatvec

LbfgsInvHessProduct.rmatvec(x)

  Adjoint matrix-vector multiplication.

  Performs the operation y = A^H * x where A is an MxN linear operator and x is a column vector or 1-d array.

  Parameters:
    x{matrix, ndarray}

      An array with shape (M,) or (M,1).

  Returns:
    y{matrix, ndarray}

      A matrix or ndarray with shape (N,) or (N,1) depending on the type and shape of the x argument.

  Notes

  This rmatvec wraps the user-specified rmatvec routine or overridden _rmatvec method to ensure that y has the correct shape and type.