Error: subscript indices must either be real positive integers or logicals. matlab – Quick tips.

Question

Here is the program I run:

function out = CointPairs(PriceMat, Symbols)
  out=[];
  NofStocks = size(PriceMat, 2);
  CointMatrix= zeros(NofStocks);
 
  [rows, cols] = find(CointMatrix);
  CointPairs = [rows, cols];
  **cf= (CointPairs(:,1)-CointPairs(:,2))==0;**
  CointPairs(cf,:) = [];
 
  if(isempty(CointPairs))
  warning('No Cointegrated Pairs Found')
  return
  end
 end

cf= (CointPairs(:,1)-CointPairs(:,2))==0;

After I run, it returns an error:

[Err] ERROR:
Subscript indices must either be real positive integers or logicals

Does anyone have any suggestions for the problem below: subscript indices must either be real positive integers or logicals. matlab in the matlab. How to correct it?

lyytutoria · Accepted Answer

The cause: After researching your problem for hours, I found that you had tried to reference the CointPairs variable, but it didn't exist. This is due to when you ran find, there was not an entry that was equal 1 or different with 0 in your CointMatrix. It can be seen from that you attempted to access your matrix by using invalid inputs, so the error occured. Solution: You are only allowed to use the positive numbers such as 1, 2, 3, 4,... or logic operators like true/false, and you mustn't use the empty matrix, 0, negative number and floating point. When you do that, your error can be solved effectively.

Rose Terrier · Answer

"Subscript indices must either be real positive integers or logicals." is an indication that the index you're trying to refer to does not exist. It is most likely CointPairs (:,2) doesn't exist.

My suggestion is to place a break point on the line CointPairs = [rows, cols]; so that you can see the CointPairs matrix. Check to see if the second column exists.

We hope this helps.

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