It is possible to use the to the number of values that are expected to be returned.

This allows you to write functions that behave differently depending on the number of values that the user of the function has requested.

As a developer, good luck extending your function to take one more argument, or one fewer, without having to rewrite your entire argument parsing logic. In our case, this means declaring x as the first argument.

If you want your function to accept optional, named arguments, you end the arguments list with the varargin keyword, which is a catch-all for any additional inputs (similar to the ... The next thing you need is an input Parser object, which is created with the input Parser function.

In this particular case, the two values could have been returned as elements of a single array, but that is not always possible or convenient.

The values to be returned may not have compatible dimensions, and it is often desirable to give the individual return values distinct names.

I really like using the name-value pair instead of an optional argument so I'll probably use that for new code.

With the help of the class, it’s easy to add param-value pairs to your own functions.

This class has two great uses: (1) validation of function inputs and (2) collation of all those inputs into an easy-to-use struct.

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Anyone whose written their own functions in MATLAB has probably been frustrated by the language's lack of flexibility when it comes to function arguments (especially when compared to other languages used for similar tasks, like R and Python).