Error in Matlab Function Block: Index exceeds array dimensions

Question

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 computing the parameter k for the scalar reference governor. and Hx and Hv are the maximal admissible output sets(MAS) with the matrices A,B,C,D hope can get some help to fix this code from 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

Ben S · Accepted Answer · 2021-05-04 07:45:32Z

1

Well this depends mainly on the size your inputs v_previous and r (As The error specifies the range "1-2" i guess, "r" and "v_previous" are scalar values).

The error occurs, because you want to iterate through 100 elements of "a", but as Hx=(C*A); only creates a 1x2 Matrix, a = Hx*(r-v_previous); will result in a Matrix "a" with fewer than 100 entries (Exactly two entries if only multiplied with a scalar value). And this must lead to the "Out of range - Error".

To get rid of the error, simply use

for i=1:numel(a)
    if a(i)> 0
        k=min(k, b(i)/a(i));
    end       
end

This way, it will only iterate through the available array elements.

edited May 4, 2021 at 7:45

answered May 4, 2021 at 5:30

Ben S

1681 silver badge10 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

life Over a year ago

thx for helping me solve the error, the code that you suggest can work thx again for the help

Ben S Over a year ago

I am glad I was able to help you! Then you can mark the question as solved 👍

Collectives™ on Stack Overflow

Error in Matlab Function Block: Index exceeds array dimensions

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related