Write function with multiple output, like sort()

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nvmnghia 2020-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/521319-write-function-with-multiple-output-like-sort

评论： Tommy 2020-4-29

B = sort(A);
[B, I] = sort(A);

How can I write such a function? Is it as simple as return both B and I, but the first line just uses B and ignore I, or there's some polymorphism trick under the hood?

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采纳的回答

Tommy 2020-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/521319-write-function-with-multiple-output-like-sort#answer_428853

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function [out1, out2, out3] = myfunc
    ...
end

As an example, this function has 3 outputs. You can call it with

[a, b, c] = myfunc

if you want, or you can use

a = myfunc

to just get out1, or perhaps

[~, b, c] = myfunc

to just get out2 and out3. Inside myfunc, each output simply needs to be assigned a value before the end of the function. Is this what you mean?

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Steven Lord 2020-4-28

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You can't force someone to call your function with the desired number of outputs, but you could encourage then to do so or refuse to cooperate if they don't.

function [B, I] = mysort(A)
if nargout < 2
    warning('You really should call mysort with two output arguments')
    % or
    error('You must call mysort with two output arguments')
end
% Do stuff to compute B and I
end