- The step function: The transfer function can be entered in MATLAB, and, assuming zero initial conditions. Type help step to see interesting information on the function. We are only doing the simplest form today. The response to a unit step input of force (for M=0.5, B=0.4, K=1.4) is calculated and plotted as follows: num=1 % numerator den=[?? ?] % coefficients of s in the denominator polynomial (you substitute the ? values for m, b and k t=0:.1:10 % vector of points of time, 0 to 10 sec in tenths of sec y=step(num, den, t); % MATLAB systems function to show step response plot(t,y) % Create a x vs. time plot using these commands and put it in your report. Label axes using xlabel(), ylabel(), and title()