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Check Variable Scope in Editor. Use MATLAB ® function and variable highlighting features to identify when and where your code uses a particular function or variable. Variable Names. Create valid variable names and avoid potential naming conflicts. Transparency in MATLAB Code. Write code that MATLAB can optimize more effectively.
MATLAB parses the function before it's ever run. It looks for variable names, for instance, regardless of the branching that activates (or doesn't activate) those variables. That is, scope is not determined at runtime.
Scope of variables in MATLAB. Variable scope refers to the extent of the code in which a variable can be referenced, accessed or modified, without resulting in an access error. We have already discussed that variables inside functions are local to the functions and not visible to other functions in MATLAB.
Scope. Functions define a small world of variables that are isolated from the rest of the “workspace”. This is mostly a good thing, though you may find it limiting at times. It is important to realize that a function can call itself, and even then the variables inside the called function cannot interact directly with those of the calling workspace.
Use MATLAB function and variable highlighting features to identify when and where your code uses a particular function or variable.
The next topic we will cover is scope in MATLAB. There are two types of scope: local and global. Scope is applied to variables and is important for fluidity when working with internal functions and functions from different scripts.
As a general rule, the scope of a local variable is the largest containing function body in which the variable appears, and all functions nested within that function. For more information on nested functions, see Variable Scope in Nested Functions. Guidelines to Using Variables. Lifetime of a Variable.
