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Write function with multiple output, like sort()

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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?

Accepted Answer

Tommy on 28 Apr 2020
function [out1, out2, out3] = myfunc
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?
Steven Lord
Steven Lord on 28 Apr 2020
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')
% Do stuff to compute B and I

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