Gráfica de PID

El resulatdo de la función u(t) = -t^2/2

>> t = 0:0.1:1

t =

  Columns 1 through 7

         0    0.1000    0.2000    0.3000    0.4000    0.5000    0.6000

  Columns 8 through 11

    0.7000    0.8000    0.9000    1.0000

>> w = -0.5*t.^2

w =

  Columns 1 through 7

         0   -0.0050   -0.0200   -0.0450   -0.0800   -0.1250   -0.1800

  Columns 8 through 11

   -0.2450   -0.3200   -0.4050   -0.5000

>> plot (t,w)