problem inside a for loop while trying to change values inside matlab functions

please help i don't understand what am i doing wrong

clear all
clc
kvals=0.1:0.1:7; % Change the values of k parameter
for kidx=1:length(kvals);
k=kvals(kidx);
G(kidx)=tf([k],[10*10^-3 1]);
Gtotal(kidx)=feedback(G(k),1);
TAU(kidx)=(0.01)/(G(k).num{1,1}(2));
end

this thing just won't work.

[Walter Roberson]

What difficulty are you encountering? Is there an error message?

Answer 1

[Rahul Narendra Shanbhag]

Hi Kobi,

I noticed that you are trying to create an array of transfer function variables. However, you have not declared the variable initially. This causes errors since the tf function gives a system model object as output.

Please refer to the section Array of Transfer Function Models in the given document on how to pre-allocate the transfer function array.

https://in.mathworks.com/help/control/ref/tf.html

Also, you seem to have made syntactical errors in line 7 and 8 of your uploaded code, where you are trying to access the said tf array by using the variable k. However, k is a non-integer and cannot be used as an array index. Array indices must be positive integers.

Thanks