MATLAB enforces a nesting limit of 15 for functions. This message appears when one or more of the following is true:

• Some of the functions in the file are written with end statements and others are not.

  When Code Analyzer examines the file, it checks to see if functions terminate with end statements. If the functions are not nested, you can omit their corresponding end statements. However, the same file cannot have some functions with end statements and some without.

• There is an extra end statement in the file and it appears to Code Analyzer that it matches a function keyword.

  For example, suppose your code has nested for loops and multiple unnested functions without end statements. Furthermore, suppose there is an extra end statement for one of the for loops. If that end statement appears to match a function keyword, Code Analyzer interprets it as the situation described in the first item in this list.

• Functions with end statements are nested more than 15 deep.

In the first two cases, additional messages might indicate where the extra end is. Code Analyzer indicates keywords that do not align with their matching end keywords.

If the message is due to mixing function keywords with and without corresponding end statements, fix the function style to be consistent. If there are extra end statements in the file by mistake, remove them. If you want more than 16 levels of nesting, consider using the MATLAB class system. Often the function nesting level drops and the code becomes simpler to understand when you use classes instead of nested functions.