Error using mtimes Inner matrix dimensions must agree !!

hi hope anyone can help me "Error using ==> mtimes Inner matrix dimensions must agree. Error in ==> Untitled at 28 y(t)=teta'*phi(:,t);" the code

• clear all
• close all
• clc
• N=1700;
• i=1:N;
• u(i)=sin(0.1*i)+sin(0.2*i)+sin(0.3*i)+sin(0.4*i)+sin(i)+sin(2*i)+sin(3*i)+sin(4*i);
• % identification
• %y(t)=-a1y(t-1)-b1y(t-2)+c1u(t-1)
• a1=0.5;b1=0.45;c1=0.8;
• teta0=zeros(N,3);
• %teta0=zeros(3,3);
• F(1)=0.01;
• F=zeros(1,N);
• %phi0=[0 0 0];
• y0(1)=0;
• a0=0;
• b0=0;
• c0=0;
• y(1)=0;
• y(2)=0;
• y0(2)=0;
• F(1)=0;
• for t=3:N ;
• phi(:,t)=[-y(t-1) -y(t-2) u(t-1)];
• phi0(:,t)=[y0(t-1) -y0(t-2) u(t-1)]';
• teta=[a1 b1 c1];
• y(t)=teta'*phi(:,t);
• y0(t)=teta0(t-1,:)'*phi(:,t);
• e(t)=y(t)-y0(t);
• teta0(t,:)=teta0(t-1,:)+(F(t-1)*phi(:,t)*e(t))'/(1+phi(:,t)'*F(t-1)*phi(:,t));
• F(t)=F(t-1)-((F(t-1)*phi(:,t-1)*phi(:,t-1)'*F(t-1))/(1+phi(:,t-1)'*F(t-1)*phi(:,t-1)'));
• end ;
• teta0(N,:)

[Star Strider]

Norton Antivirus identifies your upload site as a know dangerouw website, and blocks it.

Use the brown-framed green landscape picture icon instead to upload it here.

[the cyclist]

Also, please upload code, not a screenshot of code (which we cannot copy & paste and run if we want to).

Answer 1

[Elias Gule]

Are you doing elementwise multiplication? If so, then replace the '*' operator with '.*' operator, Such that

    phi0(:,t)=[y0(t-1) -y0(t-2)*u(t-1)]';

changes to

    phi0(:,t)=[y0(t-1) -y0(t-2).*u(t-1)]';

Answer 2

[Star Strider]

You had several errors that I discovered. Changing lines 28, 29 and 32 to:

y(t)=teta*phi(:,t);
y0(t)=teta0(t-1,:)*phi(:,t);
  . . .
F(t)=F(t-1)-((F(t-1)*phi(:,t-1)'*phi(:,t-1)*F(t-1))/(1+phi(:,t-1)'*F(t-1)*phi(:,t-1)));

will do the matrix calculations without throwing any errors, and producing scalar results, as your scalar assignments require.

I leave it to you to determine if it gives the correct results.