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For example f(x,y,z) or f(x,y), z is optional. If I list three variables then system uses f(x,y,z), if only 2 variables uses f(x,y).
I know how to use it by nargin function, is there better way to do so?
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When you say you know how to do it by nargin, does that mean you are also familiar with varargin? That sounds like what you want.
>> doc varargin
There is an example on this page: