find out center of stiffness for a building

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for i=1:1:ne
ckx(i)=xf;
cky(i)=yf;
b=12*Ec(i).*Iyy(i)/(L(i).^3);
c=12*Ec(i).*Izz(i)/(L(i).^3);
d=b.*xcgf(i);
e=(c.*(xcgf(i)).^2)+(b*(ycgf(i)).^2);
eval(['h',num2str(i),'l','=[b,0,d;0,c,0;d,0,e]']);
h=[b,0,d;0,c,0;d,0,e];
f=elem(i,4);%Floor Number
eval(['k',num2str(i),'l','=[h,-h;-h,h]']);
end
% center of stiffness of each floor level
for fl=1:1:dof(de,4)
for i=1:1:ne
CKx(fl)=sum(ckx(i).*k(i))./sum(k(i));
CKy(fl)=sum(cky(i).*k(i))./sum(k(i));
CKz(fl)=sum(ckz(i).*k(i))./sum(k(i));
end
end
%% it is showing undefied K during the running. What are the error in this coading?

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