syms x k
x(1)=-2;
x(2)=-1;
x(3)=0;
x(4)=1;
x(5)=2;
f(1)=-2;
f(2)=-1;
f(3)=0;
f(4)=1;
f(5)=2;
for i=0:4
a{i+1}=symsum((x*(k)).^i,k,1,5) %change this line
end
if you need double variables and not syms, use:
a{i+1}=double(symsum((x*(k)).^i,k,1,5))
