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How can I fix this error and what does mean by should return 1 or two arguments help pls

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Mudrik Ahmed
Mudrik Ahmed on 6 Sep 2021
Commented: Yongjian Feng on 7 Sep 2021
% Check userfun
userFG = checkFun(userfun,'SNOPT','userfun');
gotDeriv = 0;
try
[F,G] = userFG(x);
gotDeriv = 1;
catch
try
F = userFG(x);
gotDeriv = 0;
catch
error('SNOPT:InputArgs','userfun should return 1 or 2 arguments');
end
end
Error
Error using snopt (line 318)
userfun should return 1 or 2 arguments
Error in Untitled2 (line 173)
[x, f, inform, xmul, fmul] = snopt(xg, xlwr, xupr, xmul, xstate, ...

Accepted Answer

Jan
Jan on 6 Sep 2021
Which userfcn do you provide? You have to insert changes there, so please post the code of your userfcn.
It should start with
function [output1, output2] = theNameOfYourFcn()
% ^^^^^^^ ^^^^^^^
end

More Answers (1)

Yongjian Feng
Yongjian Feng on 6 Sep 2021
userFG shall return one or two arguments. You can see that the code tries to call userFG and retrieves two returns. If this call throws an exception, then it tries to call userFG and retrieve one retuen. If this also throws exception, then it errors out. So it expects one or two returns.
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