Wrong output from eigs function
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I've been having problmens when using the eigs command. So i tried just tiping [A,V]=eigs(eye(10)) where i expected two identity matrices as output. Except that it returns two 10x6 matrices whose non zero input are not even one. What am i doing wrong?
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Ameer Hamza
2020-12-4
编辑：Ameer Hamza
2020-12-4
0 个投票
According to the documentation of eigs(), by default, it returns 6 largest eigenvalues and their corresponding eigenvectors. Matrix V contains the eigen values along the diagonal, whereas matrix A contains six eigen vectors, one in each column.
3 个评论
Matteo Aluffi
2020-12-4
KALYAN ACHARJYA
2020-12-4
编辑：KALYAN ACHARJYA
2020-12-4
@Ameer Thanks, at first glance, I didn't see it.
d = eigs(A) %returns a vector of the six largest magnitude eigenvalues of matrix A
More:
d = eigs(A,k) returns the k largest magnitude eigenvalues.
Ameer Hamza
2020-12-4
Yes, that correct. In Matteo's case, following two will be same
[A,V]=eig(eye(10))
% or
[A,V]=eigs(eye(10),10)
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