"I've tried seraching for how to change/edit/give a specific argument but I can't find it. I've tried the following options but none seem to work:"
You can't find it because it doesn't exist.
MATLAB function input (and output) arguments are positional, not named like you are trying.
Some functions are written to parse "name-value" pairs, which are simply two adjacent inputs defined as:
- the key name as string/character vector, and
- the value corresponding to that name.
But name-value pairs only work if that function was written to parse them, i.e. literally the author has to write code that checks if any of the inputs contain particular strings and value and then does something with them, or uses the inputparser, or something similar. The help and the code of that badly-written third-party function that you linked to makes it clear that it does not parse name-value pairs.
This means that the only way to provide its input arguments is by providing the arguments by position: its title input is the 12th input argument, therefore if you want to provide the title it must be the 12th input argument when you call the function. It really is that simple, and is exactly what is described in its help.
"What am I doing wrong?"
That error this is caused by the fact that its author defined title as a variable in the function definition, so that when the code gets to this line
title(title);
of course both of those title's refers to that variable (and not the inbuilt function of the same name) which MATLAB interprets as an attempt to index into that variable (for historical reasons interpreting the character vector that you provided by its ASCII code values as the indices). Basically the code is doing this:
>> A = 'ABC';
>> A(A)
Index exceeds matrix dimensions.
Solution: rename the variable from title (bad idea) to something like titlestr
A trivial bug that indicates that the code was not tested at all, it is unlikely to be free from other bugs, and its author makes basic MATLAB mistakes without noticing. The FEX comments are worth reading too.
