Command stem for the mass spring damper system

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Silas Teixeira
Silas Teixeira 2014-2-27
评论： Silas Teixeira 2014-2-27
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)
  2 个评论
Anuj
Anuj 2014-2-27
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
Silas Teixeira 2014-2-27
yes Anuj... could you help me? Can I plot something else with this command?

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回答（1 个）

Anuj
Anuj 2014-2-27
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

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