-------- Original Message -------- Subject: RE: Vectors values Date: Fri, 28 Nov 2008 13:46:21 -0800 (PST) From: F. James Rohlf <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] Organization: Stony Brook University To: [email protected] References: <[EMAIL PROTECTED]> I am not sure why one would want that information but if you subtract the mean configuration from that of the aligned configurations the differences are the vectors. You could plot them or compute the lengths of the vectors using simple operations in matlab, R, or similar software. Note that the absolute directions are not very interesting because they are relative to the orientation of the reference configuration. The lengths of the vectors should not be interpreted individually. One needs to look at all of them to see what shape difference is implied (regions of expansion, compression, bending, etc). The spline usually shows that well. ------------------------ F. James Rohlf, Distinguished Professor Ecology & Evolution, Stony Brook University www: http://life.bio.sunysb.edu/ee/rohlf
-----Original Message----- From: morphmet [mailto:[EMAIL PROTECTED] Sent: Friday, November 28, 2008 8:07 AM To: morphmet Subject: Vectors values -------- Original Message -------- Subject: Vectors values Date: Wed, 26 Nov 2008 15:32:08 -0800 (PST) From: Jimena BoHe <[EMAIL PROTECTED]> To: [email protected] Hi everybody, I am working with geometric morphometrics with TPS programs, on seven different species of fishes. After I get the thin plate splines, I can see the variation vectors of each landmark for each specie shape configuration, compared to the mean configuration. Is there any option where I can get the values of direction and lenght of this vectors, for each landmark and each specie? I appreciate any help, Jimena. -- Jimena Bohórquez Herrera. Marine Biologist. Aquatic Ecosystems Dynamic and Management Program. Master in Science in Marine Resources Management. Instituto Politécnico Nacional - Centro Interdisciplinario de Ciencias Marinas (IPN-CICIMAR) La Paz, Baja California Sur, México. -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
-- Replies will be sent to the list. For more information visit http://www.morphometrics.org
