Matlab error in simulink for numerator of transfer function 'Unable to use a value of type tf as an index'

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I have simulink model contains multiple subsystems and one of the subsystem contains transfer functions which is defined in Matlab script as:
Z_tot = (1/(s*C_MOSFET))*(R_MOSFET + Z_C_Cu_Rcu_Rdielec_Z_ans)/((R_MOSFET + Z_C_Cu_Rcu_Rdielec_Z_ans)+(1/(s*C_MOSFET)));
[num_th,den_th] = tfdata(Z_tot,'v');
And when i simulate my model i have one error related to transfer functions. The full error sstatement is shown as below.
Invalid setting in 'model_1/GoKart/Inverter/T_junction_MOSFET/Transfer Fcn Heat sink 1' for parameter 'Numerator'.
Caused by:
Error evaluating parameter 'Numerator' in 'model_1/GoKart/Inverter/T_junction_MOSFET/Transfer Fcn Heat sink 1'
Unable to use a value of type tf as an index.
Please give me some recomendations to solve the problem.
Thanks in advance!

Respuesta aceptada

Jyotsna Talluri
Jyotsna Talluri el 25 de Abr. de 2020
Editada: Jyotsna Talluri el 25 de Abr. de 2020
Here variable s represents the transfer function and cannot be used as an index to access the elements of the arrays num_th_Case, den_th_Case.Instead you can specify the whole arrays num_th_Case and den_th_Case in the numerator and denominators of the transfer functions

Más respuestas (1)

siti nurul ain zakaria
siti nurul ain zakaria el 16 de Abr. de 2022
Editada: siti nurul ain zakaria el 16 de Abr. de 2022
num=[1 23 4 17];
den=[21 5 6 7 3];
g1=tf(num,den);
g2=zpk(g1)
Unable to use a value of type tf as an index.
how i want to fix this for line 4

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