How do I use two nested for loops to store the calculated values from a given equation in a 2 dimensional array?

When I run this, it reads the following error

"Unable to perform assignment
because the size of the left side
is 1-by-1 and the size of the
right side is 1-by-5."

Error in LabAssignment1 (line 13)
    X(i,j)= 3*cos(2*pi*t.*f +
    0.1);

M=5;
N=5;
t=[0,0.1,0.2,0.3,0.4];
f=[0,0,10,15,20];
X=zeros(M,N);
for i=1:M
    for j=1:N    
        X(i,j)= 3*cos(2*pi*t.*f + 0.1);
    end
end
disp(X)

Answer 1

[madhan ravi]

% With Loop
t=[0,0.1,0.2,0.3,0.4];
f=[0,0,10,15,20];
M = numel(t);
N = numel(f);
X=zeros(M,N);
for ii = 1:M
    for jj = 1:N
        X(ii,jj) = 3*cos(2*pi*t(ii).*f(jj) + 0.1);
    end
end
disp(X)

% Without Loop
[T,F]=ndgrid(t,f);
X = 3*cos(2*pi*T.*F + 0.1);