MATLAB Programming Fundamentals - MathWorks

(^6) Hover over one of the indicator bar markers.
A tooltip appears and displays the name of the function or variable and the line of
code represented by the marker.
(^7) Click a marker to navigate to the line indicated in tooltip for that marker.
This is particularly useful when your file contains more code than you can view at one
time in the Editor.
Fix the code by changing the instance of i at line 15 to y.
You can see similar highlighting effects when you click on a function reference. For
instance, click on addToSum.
Check Variable Scope in Editor