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

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Kobi
Kobi on 21 Apr 2013
Closed: MATLAB Answer Bot on 20 Aug 2021
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.

Answers (1)

Rahul Narendra Shanbhag
Rahul Narendra Shanbhag on 18 Jun 2020
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.
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

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