function gradient()
%%%%%%%%%%%%%%
x=-1.5
t=0.01
for i=1:1000;
    d=-g(x);
    x=x+t*d;
    y(i)=x;
end
%%%%%%%%%%%%%%%%%
figure(1)
fontsz=16;
x = -2:0.1:2;
plot(x,f(x),'-g');
hold on
plot(y,f(y),'.r');
xlabel('$x$','Interpreter','latex','FontSize',fontsz)
ylabel('$f(x)$','Interpreter','latex','FontSize',fontsz)
legend({'$f(x)$','gradient'},'Interpreter','latex')
%%%%%%%%%%%%%%%%%%%%T1%%%%%%%%%%%%%%%%%%%%%%%%%
function d=f(x);
 d = (x-1).^2;
 %%%%%%%%%%%%%%%%%%%%T1%%%%%%%%%%%%%%%%%%%%%%%%%
 function d=g(x);
 d = 2*(x-1);