continuous to discrete and plotting

2011 5 27
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[EDIT: 20110527 15:15 CDT - reformat - WDR]
hey and thanks in advance.
i have a continuous system(A,B,C,D matrices) and what i'm trying to do is:
1. plot on one graph the continuous and equivalent discrete systems response to a sequence of steps moved in time
2. the same only for a run entry
thanks again,
hagai

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Walter Roberson
Walter Roberson 2011-5-27
Sorry, I do not understand what you mean by a "run entry" ?
hagai bar
hagai bar 2011-5-28
i'm trying to get the system response to
u1= 1 0<=t<1
2 1<=t<2
3 2<=t<3
0 t>3
and
u2= t 0<=t<=3
0 t>3
trying to get the contiuous and discrete response to u1 and u2
Walter Roberson
Walter Roberson 2011-5-28
You only mentioned A, B, C, D matrices before, so I'm not sure how u1 and u2 and t fit in to this?
Is this a transfer system? A control system? A differential equation? Something else?

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Paulo Silva
Paulo Silva 2011-5-29

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clf
hold on
%continous response
%TStart is the starting time of the step
%TIncrement is the increment of the time vector
%TEnd is the end time of your step (when input returns to zero)
sys = ss(A,B,C,D);
step(sys,TStart:TIncrement:TEnd) %choose a small TIncrement
%discrete response
sys = ss(A,B,C,D,Ts); %Ts is your sampling time
step(sys,TStart:Ts:TEnd)

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