Question

Now I’m working with eigenvectors and eigenvalues on Matlab.

I used [V,D] =eigs(A), but it only generate 6 largest eigenvalues and corresponding eigenvectors! Do you know any libraries that support finding all the eigenvectors or finding a number of eigenvectors of a matrix?

I’m also working with DevC, any suggestion with devC is also welcomed! P/s: I’m not good in english, sorry about that! Thank you!

Answer 1

Use eig instead of eigs

From eig documentation

[V,D] = eig(A) produces matrices of eigenvalues (D) and eigenvectors
(V) of matrix A, so that A*V = V*D. Matrix D is the canonical form of
A — a diagonal matrix with A’s eigenvalues on the main diagonal.
Matrix V is the modal matrix — its columns are the eigenvectors of A.

From eigs documentatione

[V,D] = eigs(A) returns a diagonal matrix D of A’s six largest
magnitude eigenvalues and a matrix V whose columns are the
corresponding eigenvectors.