how to index a variable?

era
2022 1 17
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更新时间：2022 1 17
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I want to index this force that are related to the first step,
for k=1:n
for k=1
f1(k)=[-T 0 0 0 0 0]'; %[N]
f2(k)=[T 0 0 0 0 0]';
f3(k)=[0 0 0 0 0 0] ';
lump.f(k)=[f1(k) f2(k) f3(k)];
end
for k=2
f1(k)=f1(k-1)+[0 0 0 0 2 0]'; ; %[N]
f2(k)=f2(k-1)+[0 0 5 0 0 0]';
f3(k)=f3(k-1)+[0 4 0 0 0 0]';
lump.f(k)=[f1(k) f2(k) f3(k)];
end
end
how can i do this?
thank you

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era
era
2022-1-17

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KSSV
KSSV
2022-1-17

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