How to superimpose certain indices of two matrices.

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Missael Hernandez
Missael Hernandez el 3 de Nov. de 2020
Respondida: Ameer Hamza el 3 de Nov. de 2020
Suppose I have matrices K^1 and K^2. I would like to construct a globla stiffness matrix such that wwe add certain indices to construct the globlal matrix. The color coating indicates the elements being added and their corresponding index in the global matrix. How would I do this in Matlab? How would I do it if I had more matices?

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Ameer Hamza
Ameer Hamza el 3 de Nov. de 2020
For two matrices, try
K1 = rand(4);
K2 = rand(4);
Kg = zeros(6);
Kg(1:4, 1:4) = K1;
Kg(3:6, 3:6) = Kg(3:6, 3:6) + K2
For a general case
K1 = rand(4);
K2 = rand(4);
K3 = rand(4);
K4 = rand(4);
K = {K1, K2, K3, K4};
n = 2*numel(K)+2;
Kg = zeros(n);
Kg(1:4, 1:4) = K{1};
for i = 2:numel(K)
Kg(2*i-1:2*i+2, 2*i-1:2*i+2) = Kg(2*i-1:2*i+2, 2*i-1:2*i+2) + K{i};
end

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