Function 'subsindex' is not defined for values of class 'tf'

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Pulkit Sharma
Pulkit Sharma 2018-3-6
评论： Pulkit Sharma 2018-3-7
I have been trying to work on GSO code, and it keeps showing this error I made sure there was no variable in any function called step.
Does anyone point me towards what might be wrong?
Function 'subsindex' is not defined for values of class 'tf'.
Error in UpdateLuciferin (line 28)
J(i,:)=k(2);
Error in GSO (line 34)
UpdateLuciferin; % Update the luciferin levels at glowworms’
function UpdateLuciferin
global n A J Ell gamma ro
for i = 1 : n
T = A(i,1);
K = A(i,2);
G=[0 0 0 1 0 0 0 0 0;0 0 0 0 1 0 0 0 0;0 0 0 0 0 1 0 0 0;-0.003184 0 0 0 0 -0.0199 0 0 0.0199;0 0.0002985 0 0 0 0 0 0 0;0 0 -0.000398 0.00997 0 0 -0.00997 0 0;0 0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0 0];
B=[0 0 0;0 0 0;0 0 0;-1 0 0;0 -0.25 0;0 0 -0.5;1 0 0;0 1 0;0 0 1];
C=[1 0 0 0 0 0 0 0 0;0 1 0 0 0 0 0 0 0;0 0 1 0 0 0 0 0 0];
D=0;
sys = ss(G,B,C,D);
i=tf(sys);
X=i(1,1);
Y=i(1,2);
Z=i(1,3);
num=[(0.6*(T^2)*K) 4.8*K*T 9.6*K];
den=[8*T 0];
tfPID=tf(num,den);
xtf=X*tfPID;
ytf=Y*tfPID;
ztf=Z*tfPID;
a=xtf/(1+xtf);
b=ytf/(1+ytf);
c=ztf/(1+ztf);
ftf=a+b+c;
y=step(ftf);
yinfo=stepinfo(y)
k=struct2cell(yinfo);
J(i,:)=k(2);
% The Matlab ’Peaks’ function is used here. Please replace it with
% the multimodal function for which peaks are sought
%J(i,:) =-(647.9-0.7276.*x+0.6765.*y-0.1455.*x.^2+0.2327.*x.*y-0.17.*y.^2+0.001928.*x.^3-0.003643.*x.^2.*y+0.00255.*x.*y.^2-0.0008596 .*y.^3+0.0001613.*x.^4-0.0002075.*x.^3.*y+(1.244e-05).*x.^2.*y.^2+(9.413e-06).*x.*y.^3+0.0001003.*y.^4);
Ell(i,:) = (1-ro)*Ell(i,:) + gamma*J(i,:);
end

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采纳的回答

Walter Roberson
Walter Roberson 2018-3-6
i=tf(sys);
So i is a transfer function
J(i,:)=k(2);
That you are trying to use to index an array.
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Walter Roberson
Walter Roberson 2018-3-7
Not unless J just happens to be a global variable that refers to a table() object which seems unlikely.
I think it is much more likely that you failed to initialize the global variable J to be a cell array before you called the function.

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