MATLAB: Derivative filter in laplace domain

Question

I am trying to implement the simplest derivative filter, e.g.: H(s)=s, as:

H=tf([1 0],[1]);
output=lsim( H , input);

However, the expected error is that lsim "Cannot simulate the time response of models with more zeros than poles".

So, how do I implement it in Matlab?

Answer 1

You can do this using diff command.

t=[0:0.01:10];
u=sin(t);
y=diff(u)./diff(t);
plot(t,u)
hold on
plot(t(2:end),y,'r')

HTH.

Arkadiy