Question

i’m stuck with this error:

In an assignment A(I) = B, the number of elements in B and I must be the same.

yres(1)=((u – uc).^2) + ((y – yc).^2) -(d.^2);
i don’t understand, why this won’t get a skalar?since the elements are all scalar. what should be changed to get a scalar?

best regards

edit: thanks sloede, all inputs are scalar, but i still get this error

In an assignment A(I) = B, the number of elements in B and I must be the
same.

     Error in myfun (line 7)
     yres(1)=sqrt(((u - uc).^2) + ((y - yc).^2) ) -d;
    Error in fsolve (line 241)
        fuser = feval(funfcn{3},x,varargin{:});
    Error in modfsolve (line 26)
    x= fsolve(@myfun,x0,options,uc,d,spacing_amplitude,spacing_width);
    Caused by:
    Failure in initial user-supplied objective function evaluation. FSOLVE
    cannot continue.*

Answer 1

The “.” before an operator means that the following operation should be applied element-wise and not on the vector as a whole. Thus

a = b.^2

will give you as a result all elements of b squared and saved back to a. Therefore, in your code statement above, if any of u, uc, y, yc, d are not scalar but a vector, your result will be a vector as well.

Otherwise there seems to be nothing wrong with your code.