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

1 次查看（过去 30 天）
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
  3 个评论
显示 1更早的评论
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 .

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

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
  3 个评论
显示 1更早的评论
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);

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by