Function ontput missed or not assigned

Question

Tonghui Zhang 2019-6-10

0
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https://ww2.mathworks.cn/matlabcentral/answers/466248-function-ontput-missed-or-not-assigned

评论： Walter Roberson 2019-6-10

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Dear all,

I am confronted with a problem now. What I want to do is to formulate a function like

[y1,y2,y3]=f[x1,x2]

Note that the output and input dimensions are constant. Not all outputs will be assigned a value so in Matlab it will report an error. My question is that is there any method that I can assign values to the missed outputs outside when I call the function?

Thanks a lot

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per isakson 2019-6-10

编辑：per isakson 2019-6-10

"is there any method that I can assign values to the missed outputs outside [the function, f ]"

The simple answer is no - afaik.

Tonghui Zhang 2019-6-10

编辑：per isakson 2019-6-10

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Hi,

The function code is as followed

function [y1 y2]=xxx(u)
if u<10
    y1=1
else
    y2=1
end
end

The error is 'when you are calling function xxx, no value is assigned to y2'

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Answer 1

KSSV 2019-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/466248-function-ontput-missed-or-not-assigned#answer_378482

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function [y1 y2]=xxx(u)
if u<10
    y1=1 ; 
    y2= [] ;
else
    y1 = [] ; 
    y2=1 ; 
end
end

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Tonghui Zhang 2019-6-10

Thank you for your answer, I know this can solve the problem. My problem is that I don't want to update y2 in this case so, is there any method that I can update the missed output outside the function?

Walter Roberson 2019-6-10

No, there is no method to do that. You can use try/catch to handle the error more smoothly, but the error handling will be invoked before the outputs that are present are assigned.

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