At the command line, try giving the command clear with the function name, like
clear azl_assignment_7
This will remove any copies of the code that it has in memory. This can be needed if you modify code outside of the MATLAB editor, or if you write code files in the program and want to execute the code, or if you had taken the handle of the function in the past.
The only other time I have seen it give the wrong line number was cases where the code had a syntax error, in which case sometimes it gets the wrong line in reporting about the syntax error -- but in such cases the code will not execute at all.
