MATLAB: Adding smaller matrices into a bigger matrix

adding matricesloopsmatrices

How to add two small matrices a(2X2) and b(2X2) into a large matrix of K(3X3) such that matrix a occupies K(1:2,1:2) and matrix b occupies K(2:3,2:3)).
Also at the intersection of two matrices i.e., K(2,2) = a(2,2)+b(1,1)
K = (a(1,1)   a(1,2)           0
     a(2,1)   a(2,2)+b(1,1)    b(1,2)
     0        b(2,1)           b(2,2))];

Best Answer

a = [1 2;
     3 4];
b = [5 6;
     7 8];
K = zeros(3,3);
K(1:2,1:2) = K(1:2,1:2)+a;
K(2:3,2:3) = K(2:3,2:3)+b;
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