Index exceeds the number of array elements (1).

Please i need help !

i'm trying to use the extended kalman filter to estimate Li-ion battery SOC.

this is my code :

%ocv(soc) curve fitting equation
%Voc=M0 + M1*xtrue + M2*xtrue^2+ M3*xtrue^3 + M4*xtrue^4 + M5*xtrue^5 - R*i + sigmaV;
%xtrue the true value of SOC
%xhat the estimated value of SOC
%initialization
xtrue=100;
xhat=0;
sigmaX=100; %kalman error covariance
xstore=zeros(length(xtrue),maxIter);
xstore(:,1)=xtrue;
xhatstore=zeros(length(xhat),maxIter);
sigmaXstore=zeros(length(xhat)^2,maxIter);
for i=1:maxIter
    %state equation
    xhat(i+1)=xhat(i)-(eff*deltat/Cn)*I(i) +w;
    yhat=Voc(i)-R*I(i)+v;
    C=M0 + M1 + 2*M2*xtrue+ 3*M3*xtrue^2 + 4*M4*xtrue^3 + 4*M5*xtrue^4 - R*i + sigmaV;
  sigmaX=A*sigmaX*A'+sigmaW;
     sigmaY=C*sigmaX*C'+sigmaV;
    L=sigmaX*C'/sigmaY;
     xhat = xtrue +L.*(ytrue-yhat);
      %[Store infromation for evaluation/plotting purposes]
    xstore(1:17,k+1)= xtrue(:);
    xhatstore(1:17,k)=xhat(:);
    sigmaXstore(:,k)=sigmaX(:);
end
%code plot
figure(1);
plot(1:maxIter,xstore(1:maxIter)','k-',1:maxIter,xhatstore','b--');grid;
legend('true','estimate');
title('Kalman filter in action');
xlabel('iteration/time'); ylabel('soc');

and i'm guetting this error everytime:

Index exceeds the number of array elements (1).

Error in anothertry22 (line 33)

yhat=Voc(i)-R*I(i)+v;

i verified all the values but don't know how to solve it !

any suggestions please ?!

Answer 1

[KSSV]

The error is clear, you are trying to extract more number of elements then pesent in the array.

EXample:

A = rand(1,10) ; 
A(1) % no error
A(10) % no error
A(11) % error, there is no 11th element in A

This line:

yhat=Voc(i)-R*I(i)+v;

check the dimension of each array: Voc, I .. they should be within or equal to maxIter.

[Rihane boutaina]

thank you so much it works