Error : Undefined function 'minus' for input arguments of type 'struct'.

Dear All,

I've been trying to use the fsolve function, but i keep getting this following error and i can't fix it.

Undefined function 'minus' for input arguments of type 'struct'.

Error in CircleLowEpplerFlap (line 4)
F = [(CircleLowX - x(1))^2 + (CircleLowY - x(2))^2 - (RLow)^2;

Error in fsolve (line 219)
            fuser = feval(funfcn{3},x,varargin{:});

Error in FlapShapeEppler (line 371)
[xLow] = fsolve(@CircleLowEpplerFlap,CircleLowx0,CircleLowX, CircleLowY, AFFlap, RLow);

Caused by:
    Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue.

This is the way i'm calling the fsolve function on my code :

CircleLowX = AFFlap.Elipse2LowerX(end);
CircleLowY = AFFlap.Elipse2LowerY(end);
CircleLowx0 = [AFFlap.LowerX(1) AFFlap.Elipse2LowerY(end)];
RLow =  0.01;

[xLow] = fsolve(@CircleLowEpplerFlap,CircleLowx0,CircleLowX, CircleLowY, AFFlap, RLow);

CircleLowCenterX = xLow(1);
CircleLowCenterY = xLow(2);

The CircleLowEpplerFlap code is:

function [ F ] = CircleLowEpplerFlap( x ,CircleLowX, CircleLowY, AFFlap, RLow )

F = [(CircleLowX - x(1))^2 + (CircleLowY - x(2))^2 - (RLow)^2; 
    (AFFlap.LowerX(1) - x(1))^2 + (AFFlap.LowerY(1) - x(2))^2 - (RLow)^2 ];

end

These are the variables values on my Workspace when i break the code before the fsolve funcion:

CircleLowX = 0.5855
CircleLowY = 0.0198
CircleLowx0 = [0.5934 0.0198]

I couldn't find any solution to this problem.

Any help would be greatly appreciated,

Thanks

Answer 1

[Walter Roberson]

Parameterize your call to your function. See http://www.mathworks.com/help/matlab/math/parameterizing-functions.html