Order a matrix A 4x4 in another matrix B 6x6

I want to insert elements of my matrix R1(1,1); R1(1,2); ...R1(i,j) in specific positions in my matrix G=zeros(6)

G=zeros(6)

R1=[0.1680    0.8400   -1.6800    0.8400
    0.8400    5.6000    0.8400    2.8000
   -0.1680   -0.8400    0.1680   -0.8400
    0.8400    2.8000   -0.8400    5.6000]


G(i,j)=G(i,j)+R1(i1,j1)

G

So I want in G(3,3) the value of R1(1,1), in G(3,4) the value of R1(1,2) and so on, I dont know how to do a code for that

If you could help me I'd appreciate it

Answer 1

[DGM]

Something like this:

G = zeros(6);
R1 = [0.1680    0.8400   -1.6800    0.8400
    0.8400    5.6000    0.8400    2.8000
    -0.1680   -0.8400    0.1680   -0.8400
    0.8400    2.8000   -0.8400    5.6000];

% your example shows the sum
G(3:end,3:end) = G(3:end,3:end)+R1 % if you want the actual sum

G = 6×6

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1680 0.8400 -1.6800 0.8400 0 0 0.8400 5.6000 0.8400 2.8000 0 0 -0.1680 -0.8400 0.1680 -0.8400 0 0 0.8400 2.8000 -0.8400 5.6000

% alternatively
G(3:end,3:end) = R1 % if you just want to replace that part of G