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hello, how to solve the problem for matrix that a is diagonal matrix and u is random column matrix. I would like to solve the equation to get u=a*u inside the loop. But , I got index in the position 2 is invalid answer. Could you please help me?

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Thin Rupar Win
Thin Rupar Win 2020-8-26
评论： Thin Rupar Win 2020-8-26
e=ones(10,1);
a=spdiags([-e 2*e -e],-1:1,10,10);
A=full(a);
u=rand(10,1);
for k=0:9
u(:,k+1)=(A*u(:,k))/norm(A*u(:,k));
end

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Alan Stevens
Alan Stevens 2020-8-26
Matlab's indexing starts at 1 not zero, so it is complaining at u(:,k) when k is zero.

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