How to deal with name/value pairs of function arguments in MATLAB

Question

I have a function that takes optional arguments as name/value pairs.

function example(varargin)
% Lots of set up stuff
vargs = varargin;
nargs = length(vargs         


        

Answer 1

Inspired by Jonas' answer, but more compact:

function example(varargin)
  defaults = struct('A',1, 'B',magic(3));  %define default values

  params = struct(varargin{:});
  for f = fieldnames(defaults)',
    if ~isfield(params, f{1}),
      params.(f{1}) = defaults.(f{1});
    end
  end

  %now just access them as params.A, params.B