Re: geomorph gpagen coordinates

[morphmet_moderator]

----- Forwarded message from morphmet_modera...@morphometrics.org -----

Date: Wed, 19 Mar 2014 09:46:09 -0700
From: morphmet_modera...@morphometrics.org
Reply-To: morphmet_modera...@morphometrics.org
Subject: Re: geomorph gpagen coordinates
To: morphmet@morphometrics.org

----- Forwarded message from Antigoni Kaliontzopoulou <ant...@gmail.com> -----

Date: Sun, 9 Mar 2014 06:21:15 -0400
From: Antigoni Kaliontzopoulou <ant...@gmail.com>
Reply-To: Antigoni Kaliontzopoulou <ant...@gmail.com>
Subject: Re: geomorph gpagen coordinates
To: morphmet@morphometrics.org

Hi Alejo,

in reality gpagen by default projects the specimens into tangent space (option Proj=TRUE of the function). Unless you change that option to Proj=FALSE, which does not seem like a good idea for most practical applications, the coordinates that gpagen provides are superimposed coordinates IN tangent space.

Antigoni

On Sun, Mar 9, 2014 at 5:16 AM, <morphmet_modera...@morphometrics.org> wrote:

----- Forwarded message from morphmet_modera...@morphometrics.org -----

Date: Wed, 05 Feb 2014 22:39:42 -0800
From: morphmet_modera...@morphometrics.org
Reply-To: morphmet_modera...@morphometrics.org
Subject: geomorph gpagen coordinates
To: morphmet@morphometrics.org

----- Forwarded message from "Alejo ." <alejo.c.scar...@gmail.com> -----

Date: Mon, 3 Feb 2014 17:26:56 -0200
From: "Alejo ." <alejo.c.scar...@gmail.com>
Reply-To: "Alejo ." <alejo.c.scar...@gmail.com>
Subject: geomorph gpagen coordinates
To: morphmet <morphmet_modera...@morphometrics.org>

Hi all, first thanks for a so useful package! I have a question about "gpagen". I understand that the resulting coordinates of this command are in shape space, so for statistical analisys one must project them to tangent space. But the command "plotTangetSpace" runs "prcomp" directly over gpagen's coordinates. The gpagen's resulting coordinates are already on tangent space? Thanks a lot in advance

Alejo

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--


Antigoni Kaliontzopoulou

CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos
Campus Agrário de Vairão, 4485-661 Vairão
PORTUGAL
Department of Ecology, Evolution, and Organismal Biology
Iowa State University, Ames,
Iowa 50011, USA

tel: +351 91 3086188
mail to: ant...@gmail.com
            antig...@mail.icav.up.pt

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