MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuale di Servizio Scaricare il pdf (Pagina 58)

Working with the Target Language

2-38

Within the scope of a function, variable assignments always create new local

variables unless you use the

:: scope resolution operator. For example, given

a local variable

foo and a global variable foo:

%function …

…

%assign foo = 3

…

%endfunction

In this example, the assignment always creates a variable foo local to the

function that will disappear when the function exits. Note that

foo is created

even if a global

foo already exists.

In order to create or change values in the global scope, you must use the

operator to disambiguate, as in:

%function …

%assign foo = 3

%assign ::foo = foo

…

%endfunction

The :: forces the compiler to assign to the global foo, or to change its existing

value to 3.

Note: It is an error to change a value from the RTW file without qualifying it

with the scope. This example does not generate an error:

%assign CompiledModel.name = "newname" %% No error

This example generates an error:

%with CompiledModel

%assign name = "newname" %% Error

%endwith

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuale di Servizio Pagina 58