1:  x sin(pi x)         1:  sin(pi x) / pi^2 - x cos(pi x) / pi
    .                       .

  ' x sin(pi x) RET   m r   a i x RET

1:  [y, 1]
2:  sin(pi x) / pi^2 - x cos(pi x) / pi
    .

  ' [y,1] RET TAB

1:  [sin(pi y) / pi^2 - y cos(pi y) / pi, 1 / pi]
    .

    V M $ RET

1:  sin(pi y) / pi^2 - y cos(pi y) / pi - 1 / pi
    .

    V R -

1:  sin(3.14159 y) / 9.8696 - y cos(3.14159 y) / 3.14159 - 0.3183
    .

    =

1:  [0., -0.95493, 0.63662, -1.5915, 1.2732]
    .

    v x 5 RET  TAB  V M $ RET