is it possible to use step for a state space dynamic system with multi input?

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Muna Shehan
Muna Shehan 2017-4-20
编辑： Muna Shehan 2017-4-22
Hi all I have a dynamic system with A, B, C, and D that identify the state space model, this system has two inputs one is a constant value while the other is a vector with data that changes with time. can i use step function for two input channel or can I identify the two inputs directly to B and C matrices. Thanks in advance
A = [0 1 0 0;a1 a2 a3 a4;0 -1 0 1;0 a5 a5 a7];
B = [-1 0 0 0]';
C = [1 0 0 0; 0 1 0 0; 0 0 1 0; 0 0 0 1; 0 -1 0 1];
D = 0;
q = ss(A,B,C,D);
where a1,....., a7 are a constant values.

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Sebastian Castro
Sebastian Castro 2017-4-20
Yes. You can use stepDataOptions to define an option set and then pass it into the step function.
For a 2-input system, you can say:
opts = stepDataOptions('InputOffset',[1 0],'StepAmplitude',[0 2])
step(sys,opts)
This means that the first input is a constant value (offset 1, amplitude 0), and the second input is a step that starts at 0 and ends at 2.
Alternatively, you could use the lsim function to define your own input vector and have it do whatever you'd like.
Sebastian
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Sebastian Castro
Sebastian Castro 2017-4-22
You are attempting to use a variable mu which you didn't define (you defined mus)... instead, it finds a built-in function mu.
Muna Shehan
Muna Shehan 2017-4-22
编辑：Muna Shehan 2017-4-22
Thanks Sebastian for your answer and for all your comments. I appreciate your help. All the best for you Best regards

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