error while running a loop inside transfer function

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Kobi
Kobi 2013-4-18
i'm trying to change the value of k from to 0.1:0.1:7 and when i try this i get this error
??? Error using ==> InputOutputModel.subsasgn at 58
Subscript indices must either be real positive integers or logicals.
Error in ==> spect at 7
G(k)=tf([k],[10*10^-3 1]);
my code:
for k=0.1:0.1:7;
G(k)=tf([k],[10*10^-3 1]);
end
how can i fix that?

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采纳的回答

Walter Roberson
Walter Roberson 2013-4-18
You are trying to assign the value of the tf() call into G(k) when k is not an integer. Subscripts must be positive integers.
kvals = 0.1 : 0.1 : 7;
for kidx = 1 : length(kvals)
k = kvals(kidx);
G(kidx) = tf([k],[10*10^-3 1]);
end
  1 个评论
Kobi
Kobi 2013-4-19
ok, but i still don't fully understand what this line does:
k = kvals(kidx);
i'm trying to do the same for all of my program like that:
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)=(G(k).den{1}(1))/(G(k).num{1}(2));
end
and i get this error
??? Error using ==> InputOutputModel.subsref at 44
Subscript no. 2 is out of range.
Error in ==> Untitled at 5
Gtotal(kidx)=feedback(G(k),1);

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更多回答（1 个）

Kobi
Kobi 2013-4-20
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.

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