please help with the error

Can someone please help with the error?

clc;
clear;
warning off;

runs =100;

p=1;

       yt1=[];
       yt2=[];
       yt3=[];
       yt4=[];
       yt5=[];

epsi=zeros(3000,1);
simsig=zeros(3000,1);

      a0(1)=0.1; a1(1)=0.4;

      for i=2:4
      a0(i)=0.1; a1(i)=0.4;
      end

      a0(5)=0.1;a1(5)=0.4;

for i = 1:3000

      m = mod(i,5);
      if  m==0
          m=5;
      end
                   if (i==1) 
                       simsig(i) = a0(m)/(1-a1(m));
                       s=(simsig(i))^0.5;
                       epsi(i) = normrnd(0,1) * s;

                   else                     
                       simsig(i) = a0(m)+ a1(m)*(epsi(i-1))^2;
                       s=(simsig(i))^0.5;
                       epsi(i) = normrnd(0,1) * s;
                   end
  end

epsi2=epsi.^2;

yt = epsi2(2001:3000);

ytinitial = epsi2(2001:3000);
sig = simsig(2001:3000);

ytlast=epsi(3000)^2;
ytlast2=epsi(2999)^2;

s=1;
%
for i=1:1000

       m = mod(i,5);
      if  m==0
          m=5;
      end
      yt(0)=0;
      if  m==1
          yt1(s) = yt(i);
          xt1(s) = yt(i-1);
      elseif m ==2
          yt2(s) = yt(i);
          xt2(s) = yt(i-1);
      elseif m==3
          yt3(s)= yt(i);
          xt3(s) = yt(i-1);
      elseif m==4
          yt4(s)= yt(i);
          xt4 (s)= yt(i-1);
      elseif m==5
          yt5(s)= yt(i);
          xt5(s)= yt(i-1);
      end

      s=s+1;

end

yt1(yt1==0) = [];
yt2(yt2==0) = [];
yt3(yt3==0) = [];
yt4(yt4==0) = [];
yt5(yt5==0) = [];

xt1(xt1==0) = [];
xt2(xt2==0) = [];
xt3(xt3==0) = [];
xt4(xt4==0) = [];
xt5(xt5==0) = [];

yt1=yt1';
yt2=yt2';
yt3=yt3';
yt4=yt4';
yt5=yt5';

xt1 = xt1';
xt2 = xt2';
xt3 = xt3';
xt4 = xt4';
xt5 = xt5';

ytt = [ yt1, yt2, yt3, yt4, yt5];
xtt = [ xt1, xt2, xt3, xt4, xt5];

for m = 1:5

      y = ytt(:,m);
      x= xtt(:,m);
      %len = length(x);
      C = zeros(len,p+1);

      C(:,1) = 1; % The first column is for a0
      %for i = 1:p %Then we create shifted columns ( p in number ) for a 
       %  C(1+i:len,1+i) = x(1:len-i,1);     
      %end

      C = [C x];

      options =optimset('Display','off','LargeScale','off');

      coef = lsqlin(C,y,[0 1],1,[],[],[0;0],[1;1],[],options);

      alpha0(m) = coef(1);
      ar1(m) = coef(2);
  end

Error: Attempted to access yt(0); index must be a positive integer or logical. Error in test (line 67) yt(0)=0;

Answer 1

[the cyclist]

In line 67,

yt(0)=0

you are trying to access the 0th element, but MATLAB is a 1-indexed language. You cannot use the 0th position of a vector.

[dav]

thanks..

Answer 2

[Image Analyst]

You can't do this:

yt(0)=0;

MATLAB is 1-based. Index counting starts at 1. There is no 0 index. If you want to set the first element to zero, do

yt(1)=0;