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Not enough input arguments

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ameen
ameen 2013-6-21
关闭： MATLAB Answer Bot 2021-8-20
i want to calculate rpm when two values approximately the same TT and T
this is the code
function rpm =zzzzzz(modelspeed,modelresistance,propellerdiameter,density,wakefraction,thrustdeduction)
va=modelspeed*(1-wakefraction);
for rpm=100:2000;
T=modelresistance/(1-thrustdeduction);
j=va/((rpm./60)*propellerdiameter);
kt=0.37159*(1-(j/0.955))^0.8;
TT=kt*density*(rpm./60)^2*propellerdiameter^4;
kq=0.0476*(1-(j/1.0064))^0.7;
q=kq*density*(rpm./60)^2*propellerdiameter^5;
if TT(rpm)/T>0.999 %when T~T’%
rpm
return
end
end
when i run this code i receive an error message ' Not enough input arguments.' for the line of this equation
va=modelspeed*(1-wakefraction);
Best Regards, Ameen
  2 个评论
Angus
Angus 2013-6-21
what are modelspeed and wakefraction?
Angus
Angus 2013-6-21
really not sure if it could be causing any problems but I would encourage you to not use the name of your function as a variable inside the function. Rather
function rpm_calc = zzzzzz(...)
...
for rpm = 100:200;
...
if TT(rpm)/T>0.999
rpm_calc = rpm;
return
...
Not sure if using rpm inside the function is somehow trying to call the function again?

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-6-21
zzzzzz is not a script it's a function, and should be called like below
out=zzzzzz(modelspeed,modelresistance,propellerdiameter,density,wakefraction,thrustdeduction)
  5 个评论
显示 3更早的评论
Azzi Abdelmalek
Azzi Abdelmalek 2013-6-21
Is the error message the same?
Matt Tearle
Matt Tearle 2013-6-21
The error message you're getting seems to indicate a problem with how you're calling the function, rather than the function itself. I copied the function exactly as you have it, then did this:
>> zzzzzz(1,2,3,4,5,6)
And I got a different error message, related to line 10 ( if TT(rpm)/T>0.999 ).
Call the function just as I did. If you get the same error message as before, you might need to do
which zzzzzz
to figure out which function/variable MATLAB is actually finding (because it must be a different one).
Now, there are other issues with the function -- pay attention to the Code Analyzer messages you get in the Editor. I think this is what you're trying to do:
function rpm =zzzzzz(modelspeed,modelresistance,propellerdiameter,density,wakefraction,thrustdeduction)
va=modelspeed*(1-wakefraction);
for rpm=100:2000;
T=modelresistance/(1-thrustdeduction);
j=va/((rpm./60)*propellerdiameter);
kt=0.37159*(1-(j/0.955))^0.8;
TT=kt*density*(rpm./60)^2*propellerdiameter^4;
if TT/T>0.999 %when T~T’%
return
end
end
There are prettier ways to do it, but that should work.

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