Optional graphics handle as first argument in function

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chris
chris on 25 Apr 2022
Commented: chris on 25 Apr 2022
Hi,
similar to this question, I am creating some plotting functions and would like to stay consistent with Matlab built-in behavior. I.e. have a graphics handle (axes, figure, TiledChartLayout etc.) as an optional first argument for my functions (e.g. plot, nexttile).
I can see how to achieve it using varargin and an InputParser but am wondering if this can be done using the function argument validation scheme (which I appreciate a lot).

Accepted Answer

Stephen23
Stephen23 on 25 Apr 2022
Edited: Stephen23 on 25 Apr 2022
From my reading of the "Function Argument Validation" documentation here:
there is currently no way to have optional leading arguments like that.
Here is a possible untested workaround, by defining a very simple wrapper function:
function myfun(one,varargin)
if ishghandle(one)
locfun(one,varargin{:})
else
locfun(gcf,one,varargin{:})
end
end
function locfun(obj,A,B,C,...)
arguments
..
end
end
  1 Comment
chris
chris on 25 Apr 2022
Thanks for the suggestion. It anyway is a bit uncommon, I would say, to have a leading optional argument. So no wonder this is hard to reproduce.

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