DEFDBL A-Z SCREEN 9 COLOR 8, 7 WINDOW (0, 0)-(75, 1300) FOR j = 1 TO 14 tinitial = 0 tfinal = 75 t = tinitial y = 100 numberofsteps = 2 ^ (j - 1) deltat = (tfinal - tinitial) / numberofsteps FOR k = 1 TO numberofsteps yprime = .1 * y * (1 - y / 1000) deltay = yprime * deltat LINE (t, y)-(t + deltat, y + deltay), j t = t + deltat y = y + deltay NEXT k NEXT j