Subscript indices must either be real positive integers or logicals.

I am getting this error in my code, went thru different explanations but everything went-above my head.Can anyone me guide in right direction.Thanks in advance.

[KAPIL MAMTANI]

Thank you very much Mr John D`Errico. I missed this.

[John D'Errico]

Until I stepped through your code, I did not notice it either, although, in hindsight it is obvious. The important thing is to use that idea, to step through code to see what is happening, and what went wrong.

Answer 1

[John D'Errico]

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.

Answer 2

[Image Analyst]

See the FAQ. I think it explains it pretty well: http://matlab.wikia.com/wiki/FAQ#How_do_I_fix_the_error_.22Subscript_indices_must_either_be_real_positive_integers_or_logicals..22.3F

[KAPIL MAMTANI]

Thanks Image Analyst.