Re: A question about sort
- To: mathgroup at smc.vnet.net
- Subject: [mg48214] Re: A question about sort
- From: Marcus Stollsteimer <marcus314 at yahoo.com>
- Date: Tue, 18 May 2004 04:16:29 -0400 (EDT)
- References: <c89q6d$t65$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Daohua Song wrote:
> When i get the eigenvalues and eigenvectors for a matrix. i want
> to sort the eigenvalues and hope eigenvectors change the positions
> correspondingly. How to do it ?
Hi,
you can use Ordering[], e.g.
v1={1,3,2};
v2={a,c,b};
myorder=Ordering[v1];
v1sorted=v1[[myorder]];
v2sorted=v2[[myorder]]
Out: {a, b, c}
for your specific problem, use
{v1,v2} = Eigensystem[matrix]
Regards,
Marcus
--
The truth is rarely pure and never simple. -- Oscar Wilde