What is generating "Subscript indices must either be real positive integers or logicals" in my code?

I have attached my code. I know the error happens in my mathematical expression, I just don't understand exactly what the error is telling me. Lines 14-20 show a mathematical function I created to fit my data and that I want to use in a non-linear squares fit to optimize two parameters: p1 and p2. Please help me figure out what this error is saying in my situation. Thanks!

Answer 1

[Jan]

Please do not code as screenshot, but as text. Then the readers can use it by copy&paste.

matlabFunction is a 79282x1 vector. In you code you try to evaluate it as a function with non-integer indices. This cannot work. Simplified:

x = 1:3
x(2.7)   % ERROR!

[Kelly McGuire]

Sorry about that. So, I shouldn't use matlabFunction? I tried, now, doing modelFun = @(p,VarName1) before the function, and it isn't a 79282x1 vector anymore, but now it's saying not enough input arguments.

[Jan]

Please post the code and the complete error message.

Answer 2

[Image Analyst]

We see this several times a day or week. So, since it's a VERY Frequently Asked Question, I just refer you to the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_fix_the_error_.22Subscript_indices_must_either_be_real_positive_integers_or_logicals..22.3F