Simulink function giving an error of incorrect dimensions of matrix multiplication. Using MATLAB 2021b.

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John 2023-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/2005777-simulink-function-giving-an-error-of-incorrect-dimensions-of-matrix-multiplication-using-matlab-202

评论： Paul 2023-8-8

function op = fcn(ip)

mass =5 ; % mass of block

x = 0.3; y = 0.2; z = 0.1; % dimensions of block

Jx = (mass / 12) * (y^2 + z^2);

Jy = (mass / 12) * (x^2 + z^2);

Jz = (mass / 12) * (x^2 + y^2);

Jxz = 0;

J = [Jx 0 -Jxz; 0 Jy 0; -Jxz 0 Jz];

% Parse Input

OMG = ip(1:3) ;

EUL = ip(4:6) ;

TRQ = ip(7:9);

P_hi = EUL(1);

t_heta = EUL(2);

p_si = EUL(3);

P = OMG(1);

Q = OMG(2);

R = OMG(3);

OMGG = [0 -R Q; R 0 P; -Q P 0];

H = [1 tan(t_heta)*sin(P_hi) tan(t_heta)*cos(P_hi);

0 cos(P_hi) -sin(P_hi);

0 sin(P_hi)/cos(t_heta) cos(P_hi)/cos(t_heta)];

EUL_dot = H*OMG;

OMG_dot = J\ (TRQ - OMGG*J*OMG);

op = [OMG_dot; EUL_dot];

end

ERROR. Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the number of rows in the second matrix. To perform elementwise multiplication, use '.*'.

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John 2023-8-8

i have performed all these steps, but stil same error. All matrices sizes are perfect as per the multiplication laws of matrices. still giving error:

Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the number of rows in the second matrix. To perform elementwise multiplication, use '.*'. Function 'MATLAB Function' (#249.797.804), line 33, column 15: "H * OMG" Launch diagnostic report.

Component:MATLAB Function | Category:Coder error

Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the number of rows in the second matrix. To perform elementwise multiplication, use '.*'. Function 'MATLAB Function' (#249.839.846), line 34, column 34: "J * OMG" Launch diagnostic report.

is it some MATLAB Version error or what