Matlab error in simulink for numerator of transfer function 'Unable to use a value of type tf as an index'
22 views (last 30 days)
Show older comments
Selam Dagne
on 15 Apr 2020
Edited: siti nurul ain zakaria
on 16 Apr 2022
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!
2 Comments
Accepted Answer
Jyotsna Talluri
on 25 Apr 2020
Edited: Jyotsna Talluri
on 25 Apr 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
0 Comments
More Answers (1)
siti nurul ain zakaria
on 16 Apr 2022
Edited: siti nurul ain zakaria
on 16 Apr 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
0 Comments
See Also
Categories
Find more on Programmatic Model Editing in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!