function T=Tabladifer(x,y)
n=length(x)-1;
T=zeros(n+1,n+1);
T(:,1)=y(:);
for i=1:n
for j=1:i
T(i+1,j+1)=(T(i+1,j)-T(i,j))/(x(i+1)-x(i-j+1));
end
end