why i getting Output argument error ?
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I wrote this function code but I want to know why I getting this error
Error in ==> WvPr at 19 g = 9.8; % gravity acceleration in m/s^2
??? Output argument "HmoJfl" (and maybe others) not assigned during call to "C:\Users\Mac\Documents\MATLAB\WvPr.m>WvPr".
Error in ==> Untitled at 7 [HmoJfl,TpJfl,HmoJfd,TpJfd,HmoPMfd,TpPMfd]=WvPr(U10,X);
and if You can help me to correct it I'm really thank you :(
THANK YOU IN ADVECE
回答（2 个）
Matt J
2014-12-30
The first line of the function WvPr() has a list of output arguments
HmoJfl,TpJfl,HmoJfd,TpJfd,HmoPMfd,TpPMfd
that it promises to return. However, this promise is not being fulfilled. The error message means that these variables are not computed anywhere in the mfunction.
4 个评论
per isakson
2014-12-30
编辑：per isakson
2014-12-30
... and that's because
K>> m = 1:Cd;
K>> m
m =
Empty matrix: 1-by-0
What value do you intend to assign to m?
 
Here are some links on debugging in Matlab
lina
2014-12-30
per isakson
2014-12-30
Start to use the debugging features to find out what is going on in your code.
lina
2014-12-30
Star Strider
2014-12-30
0 个投票
Check the value of ‘U10’. By my calculations, if it is <28540, ‘Cd’<1, ‘m’ will be empty, and none of the loops will ever execute.
6 个评论
lina
2014-12-30
Star Strider
2014-12-30
编辑：Star Strider
2014-12-30
If you set ‘Cd’=1 here:
Cd = (0.001)*(1.1+0.035*(U10))
and solve for ‘U10’, the result is 28540. If ‘U10’ is less than that value, ‘m’ will be empty. The main loop will then not execute, and none of the return values will be calculated.
To see the effect on ‘m’ if ‘U10’ is less than 28540, run these lines:
U10 = 28539;
Cd = (0.001)*(1.1+0.035*(U10))
m = 1:Cd
The function should be edited with the additional error-catching block at the beginning of the code:
if U10 < 28540
error('WvPr error: U10 must be at least 28540')
return
end
Star Strider
2014-12-30
If the ‘U10’ value is less than 28540, none of the loops execute. The error block would catch that, issue the error, and return to the calling program, rather than giving you the ‘unassigned output argument’ error.
Check the value of ‘U10’ in your program. If it is less than 28540, you will have to debug your code to find the reason, then correct your code so that the value of ‘U10’ is large enough. Otherwise, you will not be able to use the ‘WvPr’ function.
lina
2014-12-30
Star Strider
2014-12-30
My pleasure!
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2014-12-30
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