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?
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Tommy
2020-4-28
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
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
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