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11.7.3 Private Functions

In many cases one function needs to access one or more helper functions. If the helper function is limited to the scope of a single function, then subfunctions as discussed above might be used. However, if a single helper function is used by more than one function, then this is no longer possible. In this case the helper functions might be placed in a subdirectory, called "private", of the directory in which the functions needing access to this helper function are found.

As a simple example, consider a function func1, that calls a helper function func2 to do much of the work. For example

function y = func1 (x)
  y = func2 (x);

Then if the path to func1 is <directory>/func1.m, and if func2 is found in the directory <directory>/private/func2.m, then func2 is only available for use of the functions, like func1, that are found in <directory>.

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