Command stem for the mass spring damper system

Does anybody here could help me to use the command "stem" for the mass-spring-damper system? I have some equations like:

equation := ode({m*x''(t) + c*x'(t) + k*x(t), x(0) = 0 , x'(0) = 1}, x(t))

where: m = mass, c = dampering constant , k = spring constant

or using Laplace

num = 1;

den = [m c k];

step = (num,den)

or using state-space model above using the ss function in MATLAB

A = [0 1; -k/m -c/m];

B = [0; 1/m];

C = [1 0];

D = [0];

sys = ss(A, B, C, D)

step(sys)

[Anuj]

what do you want to do with stem command? Stem is a command to plot discrete data, do you want discrete plot of step response ?

[Silas Teixeira]

yes Anuj... could you help me? Can I plot something else with this command?

Answer 1

[Anuj]

You can simply do

stem(step(sys))

you can read the documentation about it. there is nice explanation about the command. for that, type

doc stem

regards

[Silas Teixeira]

thks a lot...