Error in while loop

Question

Mughees Asif 2019-3-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/450923-error-in-while-loop

评论： Torsten 2019-3-19

function IsStable(polynomial)
if AllNonZero(polynomial) == false
    H=[]
elseif AllSameSign(polynomial) == false
    H=[]
else 
   HurwitzMatrix(polynomial);
   pm = length(polynomial);                       
        while i=1:pm
        minor(i)=det(polynomial(1:i,1:i));             
        end
            if minor(i)>0
                B=1  
            else
                B=0
            end
end

I am trying to run this code but get this error,

Undefined function or variable 'minor'.
Error in IsStable (line 12)
            if minor(i)>0        

Any suggestions? Thank you.

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Answer 1

Torsten 2019-3-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/450923-error-in-while-loop#answer_366081

Do you want a different value for B for each minor, i.e. B(i) instead of B ?

Then use

function IsStable(polynomial)
if AllNonZero(polynomial) == false
    H = []
elseif AllSameSign(polynomial) == false
    H = []
else 
   HurwitzMatrix(polynomial);
   pm = length(polynomial);                       
   for i = 1:pm
     minor(i) = det(polynomial(1:i,1:i));             
     if minor(i) > 0
       B(i) = 1  
     else
       B(i) = 0
     end
   end
end