Sorted list of eigenvalues

Adri van der Meer — Tue, 12 Mar 2013 03:58:08 Z

Use the output=list option to calculate the eigenvalues and eigenvectors

 with(LinearAlgebra):
A := evalf(RandomMatrix(5,generator=rand(-2..5)));
eig := Eigenvectors(A, output=list);
s := sort( eig, (x,y)->abs(x[1])<abs(y[1]) );
S := s[1..5,1]; # Sorted list of eigenvalues
V := Matrix( op~(s[1..5,3]) ); # the matrix of eigenvectors

Now you can get the ordered eigenvalues by S[1], S[2], etc.

Thank you very much it worked

killerpriest — Thu, 14 Mar 2013 23:12:35 Z

Thank you very much it worked

MaplePrimes - answers and comments on Question, Sorting and assigning eigenvalues by magnitude or absolute

Sorted list of eigenvalues

Thank you very much it worked