code to find minimum of a quadratic function using newton method with exact line search

I have wrote this code but I recieve an error meassage , what is the mistake and is the code correct to solve using newton method with exact line search

clearvars;

clc;

syms x y

% b= (x-2)^4 +(x-2*y)^2

b = (x - 2*y)^2 + (x - 2)^4

f = @(x)(x(1)-2)^4 +(x(1)-2*x(2))^2 ;

gradient (b)

b= @ (x,y) (x-2).^4 +(x-2*y).^2

g= @ (x,y)[2*x - 4*y + 4*(x - 2)^3 ; 8*y - 4*x]

B=@(x,y) [2+12*(x-2)^2 -4 ; -4 8 ]

x(1)=0;

y(1)=3;

i=1;

% p = rand(1,1) ;

p1= -B(x,y)\g(x,y);

for i=2:4

x(i) = x(i-1) + p1

y(i) = y(i-1) + p1

p(i) = -B(x(i),y(i))\g(x(i),y(i))

end