Variable numbers of arguments:

In the functions there have been a fixed number of input and output arguments. For illustration, in the function below, there is one input argument and two output arguments:

Though, this is not always the situation. It is possible to have a variable number of arguments that is both input and output arguments. The built-in cell array varargin is used to store a variable number of input arguments and a built-in cell array varargout can be used to store variable number of the output arguments. These are cell arrays as arguments could be of different types, and only cell arrays can store various kinds of values in the various elements. The nargin function returns the count of input arguments which were passed to the function, and the function nargout establishes how many output arguments are expected to be returned from a function.