solve nonlinear equations

Im trying to solve 5 nonlinear equations with 5 unknowns, but im getting an error?

x0 = [-0.0018; 2.8914; 30.6782; 35.3729; 0.2481];           % Make a starting guess at the solution
options=optimset('Display','iter');   % Option to display output
[x,fval] = fsolve(@moments,x0,options)  % Call solver
??? Error using ==> vertcat
CAT arguments dimensions are not consistent.

Error in ==> moments at 2
F = [2*x(4)*x(2)*x(5)*(x(3)^((x(5)-1)/x(5))) + x(1) + 0.000216678;

Error in ==> fsolve at 254
            fuser = feval(funfcn{3},x,varargin{:});

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

What is the error in moments.m at line 2? what did i do wrong?

Answer 1

[Andrew Newell]

The problem may be in the following line. Make sure it is just a scalar. To give an example,

F = [2*x(4)*x(2)*x(5)*(x(3)^((x(5)-1)/x(5))) + x(1) + 0.000216678;
     x(1)];

will not trigger a vertcat error, but

F = [2*x(4)*x(2)*x(5)*(x(3)^((x(5)-1)/x(5))) + x(1) + 0.000216678;
     x(1:2)];

will.