Variables within nested functions are accessible to more than just their immediate function. A variable, x, to which you assign a value or use within a nested function resides in the workspace of the outermost function that both contains the nested function and accesses x. Therefore, the scope of x is the function to which this workspace belongs, and all functions nested to any level within that function.

If you intentionally use a variable in this manner, it is not a problem. For examples, see the MATLAB Programming Demo on Nested Functions.

However, if you unintentionally use a variable in this manner, it can result in unexpected behavior. If the highlighting indicates that the scope of a variable spans multiple functions, and that was not your intent, consider:

• Renaming the nested function variable so it does not match the outer function variable name.

• Passing the variable into the function as an input argument instead of using the variable directly within the nested function.

For more information, see Variable Scope in Nested Functions.