MATLAB POLYSPACE RELEASE NOTES Instrukcja Użytkownika Pobierz pdf (Strona 163)

Scripts and Functions

other M-files) while subfunctions cannot. Subfunctions are visible only to the

primary function and other subfunctions within their own M-file.

The

rank functionshowninthesectionon“Functions”onpage4-22isan

example of a primary function.

Private Functions

A private function is a type of primary M-file function. Its unique

characteristic is that it is visible only to a limited group of other functions.

This type of function can be useful if you want to limit access to a function, or

when you choose not to expose the implementation of a function.

Private functions reside in s ubdirectories with the special name

private.

They are visible on ly to functions in the p a rent directory. For ex ample,

assume the directory

newmath is on the MATLAB search path. A subdirectory

newmath called private can contain functions that only the functions in

newmath can call.

Because private functions are invisible outside the parent directory, they can

use the same names as functions in other directories. This is useful if you

want to create your own version of a particula r function wh ile retai n ing the

origina l in another dir ectory. Because MATLAB looks for private functi ons

before standard M-file functions, it will find a private function named

test.m

before a nonprivate M-file named test.m.

Nested Functions

You can define functions w ithin the body of any M ATLAB M-file function.

These are said to be nested within the outer function. A nested function

contains any or all of the components of any other M-file function. In this

example, function

B is nested in function A:

function x = A (p1, p2)

...

B(p2)

function y = B (p3)

...

end

...

end

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MATLAB POLYSPACE RELEASE NOTES Instrukcja Użytkownika Strona 163