Replacement for for loop in matlab

Uplim=input('Input the Upper limit:' ); 
Lowlim=input('Input the Lower limit: ');

sum=0;  
for n=Lowlim:Uplim
    wt=-2*pi:1e-3:2*pi; 
    f=(cos(n*wt))/((n^2)-1); 
    sum=sum+f;  
end

Answer 1

[Jan]

clear('sum')   % Just to be sure, not for productive code
Lowlim = 2;
Uplim  = 10;

% Cleaned loop:
S1 = 0;  
wt = -2*pi:1e-3:2*pi; 
for n = Lowlim:Uplim
    S1 = S1 + cos(n * wt) / (n^2 - 1);  
end

% Without a loop:
wt = -2*pi:1e-3:2*pi;
n  = (Lowlim:Uplim).';
S2 = sum(cos(n .* wt) ./ (n .^ 2 - 1), 1);

isequal(S1, S2)

Hint: Do not use "sum" as name of the variable, bcause this causes conflicts with the built-in function sum().