Assign separate handles to function outputs

2 vues (au cours des 30 derniers jours)
Lukas Bystricky
Lukas Bystricky le 25 Août 2015
Modifié(e) : Matt J le 25 Août 2015
I have a function that returns two outputs, the function value and its derivative. I'd like to create separate handles to the function value and the derivative. Is this possible?
For clarity, I'd like to do something like this:
function [f, fdx] = get_values(x)
...
end
f = @(x) get_values(x) %first output
g = @(x) get_values(x) %second output somehow, not sure how to do this

Réponses (1)

Matt J
Matt J le 25 Août 2015
Modifié(e) : Matt J le 25 Août 2015
Create an additional function
function fdx=get_fdx(x)
[~,fdx]=get_values(x);
end
and now
f = @get_values%first output
g = @get_fdx %second output somehow, not sure how to do this
  2 commentaires
Walter Roberson
Walter Roberson le 25 Août 2015
I agree. Notice that you need a real function for this, not an anonymous function. MATLAB does not provide any mechanism to access any function output other than the first except for the case that the output is being assigned to a location with "=". You cannot access the second output of a function from within an anonymous function.
Matt J
Matt J le 25 Août 2015
Modifié(e) : Matt J le 25 Août 2015
If you return the arguments as structure fields,
function out = get_values(x)
....
out.f=f;
out.fdx=fdx;
end
then you can do things like,
f = @(x) getfield(get_values(x),'f') %first output
g = @(x) getfield(get_values(x),'dfx') %second output

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