Hi Asli
If you get the do loop out of the code so that the three lines
for n=0:6
pol=toplam + 2.*(x).*cheby(n-1,x)-cheby(n-2,x);
end
are just
pol=toplam + 2.*(x).*cheby(n-1,x)-cheby(n-2,x);
then cheby(n,x) it works correctly. Then you can call it in a for loop for different values of n.
And if you replace
pol = 1 with pol=ones(size(x));
then the function will work with a vector of x values.
