Re: [eigen] Rigid Transformations in eigen: discussion thread |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] Rigid Transformations in eigen: discussion thread*From*: Rohit Garg <rpg.314@xxxxxxxxx>*Date*: Thu, 17 Sep 2009 22:21:09 +0530*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=rEE0LgRFMv/4v8gmEWNyQZTyH7wQRjbL4y836BqoK/U=; b=tqea84Di70de/BV8zx/+xgyNp7HwepN8ns9dBCPOOy14dyWbVtl/Bnzd7a3m5xQuC2 GXkiuJeZSD87DabioKcP8ZrutcRadFqvmdUBvgT8Wb4fI93igYtt5HyflTPtZFaDY9Uk a+k806Pdz5Su6eBFSTTIPwPxmaptrGwZvSE/4=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=MwqhMzPoEc96/j4a22sK488dK8RKEJOq2uwxXMcrv7D0flul5e0roN88E5P5ne5due eqOlOm9z4PWwOIR4M51rSA54jMnlGVkr0UmyAnwBcsk+E+sqAQ76Tp778QrsjPGhZHLJ hXeUSqZBkxrw0nHkLDp+nl7wh558tLl7MyzqI=

On Thu, Sep 17, 2009 at 10:01 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx> wrote: >> b) How does eigen do say, 4D rotations? I thought it did only 2D and >> 3D rotations. I don't know if rigid transformations make sense for 2D. >> At any rate, 2D transformations are trivial. > > 4D rotations? What's this? > > I guess that would be "4x4 real orthogonal matrices with determinant 1 > and with the eigenvalue 1 with multiplicity at least 2" > > whee! no, we don't have a class for that :) > >> >> c) Inverse would be good, I agree. You just need to do take take the >> conjugate of both the quaternion parts. > > Inverse sounds useful indeed. Don't know about the formula, i trust you =) Inverse is pretty trivial actually. You just take conjugates of the two quaternions. > > transform conversion sounds useful too. > > Benoit > > > -- Rohit Garg http://rpg-314.blogspot.com/ Senior Undergraduate Department of Physics Indian Institute of Technology Bombay

**References**:**[eigen] Rigid Transformations in eigen: discussion thread***From:*Rohit Garg

**Re: [eigen] Rigid Transformations in eigen: discussion thread***From:*Adolfo Rodríguez

**Re: [eigen] Rigid Transformations in eigen: discussion thread***From:*Rohit Garg

**Re: [eigen] Rigid Transformations in eigen: discussion thread***From:*Benoit Jacob

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