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 2021-9-6

0
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评论： Yongjian Feng 2021-9-7

% 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, ...

采纳的回答

Jan 2021-9-6

0
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在 MATLAB Online 中打开

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

更多回答（1 个）

Yongjian Feng 2021-9-6

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1447679-how-can-i-fix-this-error-and-what-does-mean-by-should-return-1-or-two-arguments-help-pls#answer_781839

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.