-------- Original Message --------
Subject: Re: projected or not?
Date: Tue, 15 Dec 2009 20:37:56 +0000
From: F. James Rohlf <[email protected]>
Reply-To: [email protected]
To: morphmet <[email protected]>
It is easy to tell. Do a PCA and look at all the eigenvalues. If there a
4 zero eigenvalues (around 10^-16) for 2D data then they are in the
tangent space. If there are just 3 zeros plus a small one (around
10^-8) then no. Same idea for 3D data but the number is 7.
The tps software has options for this projection. Default is to project.
------Original Message------
From: morphmet
To: Morphmet
Subject: projected or not?
Sent: Dec 15, 2009 3:14 PM
-------- Original Message --------
Subject: projected or not?
Date: Tue, 15 Dec 2009 20:13:12 GMT
From: Ondřej Mikula <[email protected]>
To: [email protected]
Dear list,
although I am not new in geometric morphometrics, I am still not sure
about Procrustes coordinates in outputs of popular morphometric
programmes (tpsRelw, PAST). Are they already projected into the
tangent space?
Thanks for advice
Ondrej Mikula
--
Replies will be sent to the list.
For more information visit http://www.morphometrics.org
--------------------------------
Sent remotely by F. James Rohlf
--
Replies will be sent to the list.
For more information visit http://www.morphometrics.org
