Simulink S-Function Output Ports

2018 12 2
1 个回答
更新时间：2018 12 19
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0 个投票

I'm having issues with a Simulink S-Function I've written, and keep getting the error message:
"Error in default port dimensions function of S-function 'LQR_Initial_System/LQR Implementation'. This function does not fully set the dimensions of output port 2"
Unfortunately, the S Function in question only has a single output port. The Simulink model explorer only recognises a single output port, as the pic "Model Ports.jpg" shows.
Could anyone offer any help please?
Thanks

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Fangjun Jiang
Fangjun Jiang 2018-12-3
You have to show the S-function source code to debug the problem.
Crispin Zuercher
Crispin Zuercher 2018-12-3
Sorry; I assumed it'd be with the model I uploaded.
I've tweaked the model somewhat since asking this question, however the problem still persists. Here is the source code:
function [Wheel_Force,Body_Force] = fcn(x1, x2, x3, x4, Kt, Ks, Cs,Ms,Mu,Alpha)
A = [0 0 -1 0; 0 0 1 -1; Kt/Mu (-Ks/Mu) (-Cs/Mu) Cs/Mu; 0 Ks/Ms Cs/Ms (-Cs/Ms)];
B = [0; 0; -1; 1];
R = (1/(Ms^2));
Q = [Alpha 0 0 0; 0 ((Ks^2)/(Ms^2)) ((Ks*Cs)/(Ms^2)) (-(Ks*Cs)/(Ms^2));...
0 ((Ks*Cs)/(Ms^2)) ((Cs^2)/(Ms^2)) (-(Cs^2)/(Ms^2)); 0 (-(Ks*Cs)/(Ms^2)) (-(Cs^2)/(Ms^2)) ((Cs^2)/(Ms^2))];
A_Trans = transpose(A);
R_Inverse = inverse(R);
B_Trans = transpose(B);
Coeff_Matrix = (A_Trans + A - (B*R_Inverse*B_Trans));
Coeff_Inverse = inverse(Coeff_Matrix);
P = (Q*-1)*Coeff_Inverse;
K = R_Inverse*B_Trans*P;
Wheel_Force = (-K(3)*x3);
Body_Force = (-K(4)*x4);
Liping
Liping 2018-12-19
Can you help me to solve the same problem?
Error in default port dimensions function of S-function 'fangzhen22/Embedded MATLAB Function'. This function does not fully set the dimensions of output port 2
`]8JTX`TN$%ISGH(8)R4]15.jpg
Fangjun Jiang
Fangjun Jiang 2018-12-19
Look at the .jpg file in the original question, find the similar place for your Embedded MATLAB Function block, change the "size" of "FS" from -1 to something else, likely 1 if your FS is a scalar.

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回答（1 个）

Fangjun Jiang
Fangjun Jiang 2018-12-3

0 个投票

This is not a Simulink S-function. It is a MATLAB Function block.
Anyway, as you've shown in your attached image, just explicitly specify the "size" for "F1". For example, it seems that the size of "F1" can be set as 1.

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