Function ontput missed or not assigned

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Tonghui Zhang
Tonghui Zhang 2019-6-10
评论： Walter Roberson 2019-6-10
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
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
Tonghui Zhang 2019-6-10
编辑：per isakson 2019-6-10
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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回答（1 个）

KSSV
KSSV 2019-6-10
function [y1 y2]=xxx(u)
if u<10
y1=1 ;
y2= [] ;
else
y1 = [] ;
y2=1 ;
end
end
  2 个评论
Tonghui Zhang
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
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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