keep getting Index exceeds matrix dimensions.
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x=[];
ES=[];
kt=140;
kv=140;
L=0.001;
R=10;
b=5;
J=8.6;
kp=240;
ki=180;
A=[0 1 0 0;0 -b/J kt/J 0;-kp/L -kv/L -R/L ki/L;-1 0 0 0];
B=[0;0;kp/L;1];
C=[-1 0 0 0];
D=1;
x0=[30;0;0;0];
sys=ss(A,B,C,D);
for i=1:89
sunTime2(i)=(i-1)*1800;
end
lsim(sys,sunElevation2,sunTime2,x0);
plot(x(1,:));
for i=1:89
ES(i+1)=ES(i)+x(3,i)*(kp*(sunElevation2(i)-x(1,i))+ki*x(4,i));
end;
plot(ES);
The 2nd for loop has an Index that exceeds matrix dimensions.
My purpose is to calculate the Enrgy spent.
I'd appreciate your help with finding the problem.
thanks,
Daniel
1 个评论
lsim(sys,sunElevation2,sunTime2,x0);
Also, what have you tried so far? Did you try using the debugger to determine the size and shape of your variables? Did they match your expectation?
回答（1 个）
KSSV
2021-7-27
The error is clear.....you are trying to extract more number of elements than present from an array.
EXample:
A = rand(1,5) ;
A(1) % no error
A(5) % no error
A(6) % error because there are only 5 elements in A and you are extracting 6th element
A(2,1) % error, Rememeber A is a row matrix not a column matrix
Like wise, in you variables from the line:
ES(i+1)=ES(i)+x(3,i)*(kp*(sunElevation2(i)-x(1,i))+ki*x(4,i));
check the dimensions of Es, x, sunElevation. Do they have any dimension of 89? Is x of dimension 4*89?
Did you define Es and initialize it?
The best way to check is learn debugging.
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