producing n*n matrix as an string in a loop

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talayeh tavangar 2020-6-15

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https://ww2.mathworks.cn/matlabcentral/answers/548760-producing-n-n-matrix-as-an-string-in-a-loop

评论： Image Analyst 2020-6-16

Hi,

I want to used the following code put I donot know how to safe K as an n*n mtrix in each loop. because by using my code the code only use the last element of K. would you mind helping me with that?

for i=1:20
    for j=1:20
        for k=1:400
            C{k}=E(i,j)/(1-nu(i,j)*nu(i,j))*[1,nu(i,j),0;nu(i,j),1,0;0,0,0.5-0.5*nu(i,j)];  %plane stress nu and E are poisson's ratio and young's modulus
        end
    end
end
 
for i=1:400,              %element assembly
    [B,Jac]=B_func(i);    %jacodian function 
    Ke{i}=B'*C{i}*B*Jac*0.5;         %Ke is elemental stiffness matrix
    m=elem(i,:);        
    n=[2*m-1;2*m]; 
    K(n,n)=K(n,n)+Ke{i};                    %compute global stiffness matrix K
end