does anyone knows how to write vector components inside matlab function?

I tried to create a simulink block with embedded code through "matlab function":

function xdot = fcn(m,J,u,x)
%#codegen

R = [cos(x(8))*cos(x(9)) cos(x(8))*sin(x(9)) -sin(x(8));
    -cos(x(7))*sin(x(9))+sin(x(7))*sin(x(8))*cos(x(9)) cos(x(7))*cos(x(9))+sin(x(7))*sin(x(8))*sin(x(9)) sin(x(7))*cos(x(8));
    sin(x(7))*sin(x(9))+cos(x(7))*sin(x(8))*cos(x(9)) -sin(x(7))*cos(x(9))+cos(x(7))*sin(x(8))*sin(x(9)) cos(x(7))*cos(x(8))];
%
M = [1 sin(x(7))*tan(x(8)) cos(x(7))*tan(x(8));
     0     cos(x(7))           -sin(x(7))     ;
     0 sin(x(7))*sec(x(8)) cos(x(7))*sec(x(8))];
%        
Wskew = [  0    -x(12)    x(11);
         x(12)     0     -x(10);
        -x(11)   x(10)      0  ];
%
Vb = [x(4);
      x(5);
      x(6)];
%
W =  [x(10);
      x(11);
      x(12)];
%
xdot=[R*Vb;                
      F-Wskew*Vb;          
      M*W;                 
      J\(N-Wskew*J*W];

But matlab does not interpret the entries of vector "x" to form the matrices "W", "Vb", "R" and "Wskew".

DOES ANYONE HAVE ANY IDEA THAT I CAN TRY ON THIS PROBLEM?

Thanks.

[per isakson]

Is there an error message?

[Walter Roberson]

Does simulink consider x to be a vector or a 2D array?

[Alexandre Masson Vicente]

Sorry, guys. I wrote the code with some errors. The program worked!

function xdot = fcn(m,J,u,x)
%#codegen

% atitude da aeronave na sequência 321 (projeta as medidas do INERCIAL no CORPO)
R = [cos(x(8))*cos(x(9)) cos(x(8))*sin(x(9)) -sin(x(8));
    -cos(x(7))*sin(x(9))+sin(x(7))*sin(x(8))*cos(x(9)) cos(x(7))*cos(x(9))+sin(x(7))*sin(x(8))*sin(x(9)) sin(x(7))*cos(x(8));
    sin(x(7))*sin(x(9))+cos(x(7))*sin(x(8))*cos(x(9)) -sin(x(7))*cos(x(9))+cos(x(7))*sin(x(8))*sin(x(9)) cos(x(7))*cos(x(8))];
%
% transformação das velocidades angulares nas taxas dos  ângulos de euler
M = [1 sin(x(7))*tan(x(8)) cos(x(7))*tan(x(8));
     0     cos(x(7))           -sin(x(7))     ;
     0 sin(x(7))*sec(x(8)) cos(x(7))*sec(x(8))];
%        
% matriz anti-simétrica de velocidades angulares (componentes no CORPO)
Wskew = [  0    -x(12)    x(11);
         x(12)     0     -x(10);
        -x(11)   x(10)      0  ];
% 
% vetor velocidade do centro de massa da aeronave escrito no CORPO
Vb = [x(4);
      x(5);
      x(6)];
%
% vetor velocidade angular da aeronave escrito no CORPO  
W =  [x(10);
      x(11);
      x(12)];
%  
% vetor soma das forças externas aplicadas ao veículo
F = [u(1);
     u(2);
     u(3)]
%
% vetor soma dos torques externos em torno do baricentro da aeronave
N = [u(4);
     u(5);
     u(6)];
%
% Dinâmica do Corpo Rígido descrita em ESPAÇO DE ESTADOS, xdot = f(x,u,t)
xdot=[R*Vb;                % velocidade escrita no INERCIAL
      F-Wskew*Vb;          % aceleração escrita no CORPO
      M*W;                 % rapidez com que variam os ângulos de euler
      J\(N-Wskew*J*W)];     % aceleração angular escrita no CORPO