ERROR: Array indices must be positive integers or logical values.
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"Why am I getting the error 'Array indices must be positive integers or logical values' in MATLAB when using a for loop?"
% grupo 20
Km=1.5;
Ra=8;
La=0.03;
J=0.08;
Kg=10;
Kt=0.20;
Kv=40;
T=0.02;
syms k;
%F2 y F3
A=[0 1 0; 0 0 1; -Kg*Km^2 -Ra*J -La*J];
B=[0; 0; Km];
C=[1 0 0];
sys=ss(A,B,C,0)
sys1=c2d(sys,T,'zoh')
[V,D]=eig(sys1.A)
V1=inv(V)
Dk=D^k;
Af=V*Dk*V1
X = zeros(3, 1);
y = zeros(25, 1);
for k=1:25
for j=1:K_sym
X(k)=Af(k)*X(0)+j*Af(K_sym)*B
y(k)=C*X(k)
end
end
2 comentarios
Dyuman Joshi
el 19 de Mayo de 2023
I am not able to reproduce the same error you obtained.
However, there is another error, as you can see below, which occurs because you are trying to use a variable you have not defined.
% grupo 20
Km=1.5;
Ra=8;
La=0.03;
J=0.08;
Kg=10;
Kt=0.20;
Kv=40;
T=0.02;
syms k;
%F2 y F3
A=[0 1 0; 0 0 1; -Kg*Km^2 -Ra*J -La*J];
B=[0; 0; Km];
C=[1 0 0];
sys=ss(A,B,C,0);
sys1=c2d(sys,T,'zoh');
[V,D]=eig(sys1.A);
V1=inv(V);
Dk=D^k;
Af=V*Dk*V1;
X = zeros(3, 1);
y = zeros(25, 1);
for k=1:25
for j=1:K_sym
X(k)=Af(k)*X(0)+j*Af(K_sym)*B;
y(k)=C*X(k)
end
end
Respuestas (1)
Rik
el 19 de Mayo de 2023
Actually, the result of your code is a missing variable. Once you fix that, you will have to edit your code to avoid X(0).
2 comentarios
Rik
el 19 de Mayo de 2023
You can find an explanation for the layout tools here. It is the toolbar you see when you edit your question.
Since you didn't write any comments and only use single/two letter variable names, I have no clue what you want to do. So I have no idea what you should change. Currently you are trying to retrieve the zeroth element of X. Since that is before the first element, it doesn't exist.
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