An empty cell array is not a valid input argument. QUIVER does not support {0} leading numeric input(s). Uneven parameter-value pairs. Scale argument must be a scalar double or 'off'. U and V must be the same size. X,Y both must be empty or both nonempty. The size of X must match the size of U or the number of columns of U. The size of Y must match the size of U or the number of rows of U. Z and U must be the same size. V and W must be the same size. The size of X must match the size of Z or the number of columns of Z. The size of Y must match the size of Z or the number of rows of Z. Unknown option "{0}". The sizes of X and Y must match the size of Z, or X and Y must be vectors whose lengths match the number of columns and rows, respectively, of Z. The sizes of X and Y must match the size of U, or X and Y must be vectors whose lengths match the number of columns and rows, respectively, of U. {0}