Optional graphics handle as first argument in function

Question

chris 2022-4-25

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1704430-optional-graphics-handle-as-first-argument-in-function

评论： chris 2022-4-25

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).

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Answer 1

Stephen23 2022-4-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/1704430-optional-graphics-handle-as-first-argument-in-function#answer_950290

编辑：Stephen23 2022-4-25

在 MATLAB Online 中打开

From my reading of the "Function Argument Validation" documentation here:

https://www.mathworks.com/help/matlab/matlab_prog/function-argument-validation-1.html

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