function - matlab differing argument structures -


i want write function getnewprojectionimagesize has 2 different kinds of argument structures. 1 [wp, hp] = getnewprojectionimagesize(wo, ho) , other hp = getnewprojectionimagesize(wp). on research couldn't find how it. ie this link, doesn't explain it.
possible not effort? in standard matlab functions, ie interp2 there different argument structures: interp(v) interp(x, y, v, xq, yq) etc.
solution came mind more common argument structure [wp, hp] = getnewprojectionimagesize(w, h) h optional argument (using nargin), leaving interpretation of w , h user. prefer first way if possible.

use nargin , nargout know number of input , output arguments function has been called, , use varargin , varargout access inputs or define outputs.

you need decide if function called without output arguments. in many functions case treated if call had been 1 output.

here's example.

  • with 1 input , 0 or 1 outputs: function outputs element-wise square of input.
  • with 2 inputs , 2 outputs: function outputs element-wise sum , product of inputs.

code:

function varargout = f(varargin) if nargin==1 && nargout<2 % nargout<2 covers 0-output case,     % interpreted 1 output     varargout{1} = varargin{1}.^2; % compute first (and only) output elseif nargin==2 && nargout==2     varargout{1} = varargin{1} + varargin{2}; % compute first output     varargout{2} = varargin{1} .* varargin{2}; % compute second output else     error('incorrect number of inputs or outputs') end

examples:

>> y = f([10 20 30]) % 1 input, 1 output y =    100   400   900  >> f([10 20 30]) % 1 input, 0 outputs ans =    100   400   900  >> [a, b] = f([10 20 30], 4) % 2 inputs, 2 outputs =     14    24    34 b =     40    80   120  >> y = f([10 20 30], 4) % 2 inputs, 1 output error using f (line 9) incorrect number of inputs or outputs

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