matrix equation in loop form

I would like to creat a matrix, by using the loop structure, because i have a very big values, I tried this code but no result ; any help please

    A=[2 2 6 6 4 4;2 2 6 6 4 4]
    
   for n=1:length(A)
       for m=1:2
           if n=1:2 & m=1:2
               A=2
           elseif n=3:4 & m=1:2
               A=6
           else 
               A=4
           end
       end
   end

[Rik]

Those if statements are probably not doing what you think they're doing, and you overwrite the value of A.

I suspect you want to index into an output matrix, but I can't tell for sure what you want to happen. Can you explain it in words?

[marwa hajji]

i would like to creat a matrix :

A=[2 2 6 6 4 4;2 2 6 6 4 4]

but in the structure of loop

[marwa hajji]

I would like display this matrix

[Jan]

What's wrong with this code:

A = [2 2 6 6 4 4; 2 2 6 6 4 4]

The code in the original question contains about 9 problems. I suggest to work through Matlab's Onramp to learn the basics: https://www.mathworks.com/learn/tutorials/matlab-onramp.html

[Rik]

Why exactly do you want to create the A matrix in a loop?

[KSSV]

Consider :

A=repmat([2 2 6 6 4 4],2,1)

A = 2×6

2 2 6 6 4 4 2 2 6 6 4 4

[Voss]

Maybe one of these is useful:

A = repelem([2 6 4],2,2)

A = 2×6

2 2 6 6 4 4 2 2 6 6 4 4

A = kron([1 3 2],2*ones(2))

A = 2×6

2 2 6 6 4 4 2 2 6 6 4 4

[Jan]

Or:

repelem([2,4,6], 2, 2)

ans = 2×6

2 2 4 4 6 6 2 2 4 4 6 6