MATLAB Error -- "Not enough input arguments"

Hello All,

For my first post I have a question about an error that I am getting while trying to run a function that calculates some parametrics for a wind turbine. Without further ado, here is the code:

    function [BladeAngle, BladeChord, R] = designBlade_TuesPM(NumBlades, Radius, TSR, VWind )

    %Intermediate Variables
    Vtip = TSR*VWind;
    R = 0:0.0222222222:0.2;
    Vr = Vtip*(R/Radius);

    %Outputs
    BladeAngle = atan(3*Vr/(2*VWind));
    BladeChord = (8.*pi.*R.*VWind.*cos(BladeAngle))./(3.*Vr.*0.8.*NumBlades);

Here is the error I get while trying to run it:

    >> NumBlades = 3;
    >> Radius = .2;
    >> TSR = 5;
    >> VWind = 1;
    >> designBlade_TuesPM
    Error using designBlade_TuesPM (line 4)
    Not enough input arguments.

It seems to me like I should have enough inputs for line four. What's going wrong here?

Answer 1

[Star Strider]

You need to use it in your script (preferably not always from the Command Window) as:

[BladeAngle, BladeChord, R] = designBlade_TuesPM(NumBlades, Radius, TSR, VWind )

so that you give it values for: NumBlades, Radius, TSR, and VWind, and in return it provides you with values for: BladeAngle, BladeChord, and R.

Also, consider using:

BladeAngle = atan2(3*Vr, (2*VWind));

if you get dodgy values for BladeAngle.

[Jooseppi Luna]

Thanks! That helps a lot.

[Star Strider]

My pleasure!