assemble global stiffness matrix

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Rafael Zanetti
Rafael Zanetti 2020-4-16
回答： Ameer Hamza 2020-4-16
Hello, I'd like how the easier way to assemble 2 matrices, for example, I have the following matrices:
k1 = [120 -120;-120 120]
k = zeros(5,5)
so I want to assemble this pattern:
K = [120 0 -120 0 0; 0 0 0 0 0;-120 0 120 0 0; 0 0 0 0 0; 0 0 0 0 0]
I thank you.

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Ameer Hamza
Ameer Hamza 2020-4-16
k1 = [120 -120;-120 120];
k = zeros(5,5);
k([1 3], [1 3]) = k1;
Result
k =
120 0 -120 0 0
0 0 0 0 0
-120 0 120 0 0
0 0 0 0 0
0 0 0 0 0

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