how to fix this error 'Index exceeds array dimensions. Index value 3 exceeds valid range [1-2] for array 'a'. '

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CHEW Yen LI
CHEW Yen LI 2021-5-4
评论： CHEW Yen LI 2021-5-4
HI guys, I have some problem during running the code below and it give me the error
  • Index exceeds array dimensions. Index value 3 exceeds valid range [1-2] for array 'a'. Error in 'TEST/TEST' (line 18) if a(i)> 0
This code is the code for computiong the parameter k for the scalar reference governor. and Hx and Hv is the maximal admissible output sets(MAS) with the matrices A,B,C,D hope can get some help to fix this code form your all.
function v = SRG_new(v_previous, r)
A=[0 1;-275.5 -21.22];
B=[0;1];
C=[11.02 275.5];
D=0;
I=eye(2);
Hx=(C*A);
Hv= C*((I-A)*((I-A)^-1)*B+D);
s=350; %s=max_output
a=Hx*(r-v_previous);
b=s-Hx-Hv*v_previous;
k=1;
for i=1:100
if a(i)> 0
k=min(k, b(i)/a(i));
end
end
k=max(k,0);
v=v_previous + k*(r-v_previous);
end
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CHEW Yen LI
CHEW Yen LI 2021-5-4
@KSSV HI , the input that I tried is the step input and fyi me is use the matlab function block in the simulink to code this .

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Walter Roberson
Walter Roberson 2021-5-4
Replace the loop with
mask = a > 0;
a = a(mask);
b = b(mask);
if isempty(a)
k = 1;
else
k = max(0, min(a./b));
end
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Walter Roberson
Walter Roberson 2021-5-4
Okay then, change your code from
k=1;
for i=1:100
if a(i)> 0
k=min(k, b(i)/a(i));
end
end
k=max(k,0);
to
k=1;
for i=1:length(a)
if a(i)> 0
k=min(k, b(i)/a(i));
end
end
k=max(k,0);

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