Combining matrices, adding two matrices in into a bigger one.

Ke1 = [ 3 3 -3 3; 3 4 -3 2; -3 -3 3 -3; 3 2 -3 4];

Ke2 = [ 6 3 -6 3; 3 2 -3 1; -6 -3 6 -3; 3 1 -3 2];

Kg = zeros(6);

Kg(1:4, 1:4) = Ke1

I also want to add Ke2 to Kg in (3:6,3:6) where they overlap in the middle but I don't know how.

Answer 1

[Fangjun Jiang]

Kg(3:6,3:6)=Kg(3:6,3:6)+Ke2