Output Argument not assigned during call

Question

Jesse Swanson 2020-3-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/510229-output-argument-not-assigned-during-call

评论： Peter O 2020-3-11

Good afternoon everyone,

I've been tasked to create a fairly simple code (which I've done for the most part). The code always gives the correct answers, however the grader that I must submit to presents this error:

Output argument "MaxPower" (and maybe others) not assigned during call to "MaxPowerSolver".

function MaxPower = MaxPowerSolver(ElectricalData)
Power = ElectricalData(:,2).*ElectricalData(:,3);
MaxPower = max(Power);
end

Where Electrical data is given by [t,v,i] ([time, voltage, current]).

I can't seem to work this one out after googling and researching other people's similar problems.

Please help, thank you for your time.

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Walter Roberson 2020-3-11

Somehow it is grading some other version of your code. Make sure you do not have any other function of the same name that it could be finding.

Peter O 2020-3-11

在 MATLAB Online 中打开

Yeah, you're certainly assigning the value to MaxPower. A couple of possibilities strike me:

Are you actually calling this particular function? Is it perhaps shadowed by something else on the path that has a different output assignment? Type:

which MaxPowerSolver

Or Is it potentially in the calling function? If it also calls a variable MaxPower but forgets to assign it, perhaps you're seeing an error meant for a different file? (e.g. its handling assigns to "maxPower" or "MaxPowe" by mistake.) Something maybe like:

function MaxPower = evalInputFunction(func, e_data)
    %
    MaxPowe = func(e_data) % This is the actual failure point
end
load the_data
passfail = zeros(1,numel(test_functions))
for ix = 1:numel(test_functions)
    fx = test_functions(ix)  % Your MaxPowerSolver is test_function(17), for instance
    Pmx = evalInputFunction(fx, the_data)
    if Pmax == Correct_P
        passfail(ix) = 1
    end

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Answer 1

Piyush Lakhani 2020-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/510229-output-argument-not-assigned-during-call#answer_419555

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Hi Jesse,

The error you had mentioned will occured only in the case when the output Variable "MaxPower" is not assigned in the function but as i can see it should work fine.

You may try following function.

function MP = MaxPowerSolver(ElectricalData)
Power = ElectricalData(:,2).*ElectricalData(:,3);
MP = max(Power);
end

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Jesse Swanson 2020-3-11

Thank you for your help, unfortunately this didn't resolve my issue as I believe it might be the automatic grading system which is at fault. Thank you for your time though.

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