How to plot each state space variables seperatly
显示 更早的评论
I created a state space system and I want to analyze the step response of each state space variable (x1, x2, x3...) seperatly. I'm not quite sure How am I suppose to access them. I've used the step command to creat vectors x and y, but I don't know how to creat a figure of x(t) (again, x1, x2, x3), and when Itry to access X or Y MATLAB tells me that the arrays are emptey, i would really like some help becasue I'm pretty new at MATLAB.
Thanks in advance!
My code so far:
A = [-1 4 0; 0 3 0; 0 0 -2];
B = [1 1 1];
B = transpose(B);
C = [-1 1 2];
sys = ss(A,[],C,[], 'StateName', {'x1' 'x2' 'x3'});
t = (0:0.1:5)';
[y, t, x] = step(sys,t);
plot(t, x(1));
回答（1 个）
David Wilson
2019-4-8
Couple of things. First up, you haven't inserted B into your state-space model so consequently you don't get any output.
To get the individual states, just access the relevant column of the outputted x variable.
A = [-1 4 0; 0 3 0; 0 0 -2]; % note unstable, check eig(A)
B = [1 1 1]'; % note transpose
C = [-1 1 2];
sys = ss(A,B,C,[], 'StateName', {'x1' 'x2' 'x3'}); % note B is used !
t = [0:0.1:5]';
[y, t, x] = step(sys,t);
for i=1:3
subplot(3,1,i);
plot(t, x(:,i)); % look at how I indexed into x
end
1 个评论
Ritvik Srivant
2023-2-8
Thanks this literally saved me from grave. lol :)
类别
在 帮助中心 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息
2023-2-8
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
