MATLAB: Subscript indices must either be real positive integers or logicals.

fminconoptimization

How can i solve this error.

Best Answer

Use the debugger. Type this at the MATLAB command prompt:

dbstop if error

Then run your code. When the error occurs, the code will pause at the offending line with all variables intact. Examine the indexing variables to see what their values are, then backtrack in your code to figure out why they are not the integers you expect them to be.

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MATLAB: Diff operation generating error Subscript indices must either be real positive integers or logicals

You have a variable named "diff" somewhere in your workspace. MATLAB is interpreting diff(time) as an attempt to index it.

Solution: clear it or rename it to something else.

MATLAB: Subscript indices must either be real positive integers or logicals.

Learn to execute your code ONE line at a time when you have a problem like this. Or learn to use the debugger. Then, READ THE ERROR MESSAGE.

I'll get you started. Here is where the problem occurs.

Gp = ((Kt*(1.015^(T-20)))*(P(i)/(P2+P(i)))*(TIC(i)/(C2+TIC(i)))*(N(i)/N2+N(i)))
Subscript indices must either be real positive integers or logicals.

Now, all you need to do is think about what that error means.

At that point, is i defined?

i
ans =
          0 +          1i

Learning to debug your code is one of the most important skills in MATLAB. Time to start.

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MATLAB: Diff operation generating error Subscript indices must either be real positive integers or logicals

MATLAB: Subscript indices must either be real positive integers or logicals.

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