Re: [ccp4bb] how to convert matrix to angle

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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

Previous message:
Subject: how to convert matrix to angle
From: Jiamu Du jiamudu {- at -} GMAIL {- dot -} COM
Date: 2007-07-07

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Subject: Kay Diederichs Email
From: James Stroud jstroud {- at -} MBI {- dot -} UCLA {- dot -} EDU
Date: 2007-07-07

Subject: Re: how to convert matrix to angle
From: Kay Diederichs kay {- dot -} diederichs {- at -} UNI-KONSTANZ {- dot -} DE
Date: 2007-07-07

Jiamu Du schrieb:
> Dear all:
> I want to calculate the rotation angle between two similar domains. By
> using Coot, I can superposr the two domain and get the rotation matrix.
> But how to convert this matrix to an angle. Is there any program can
> calculate this ?
> Thanks.
>
Jiamu Du,

If you have the rotation matrix
a11 a12 a13
a21 a22 a23
a31 a32 a33

then

(a11 + a22 + a33 - 1) / 2

is the cosine of the angle you're looking for.

HTH,

Kay
--
Kay Diederichs http://strucbio.biologie.uni-konstanz.de
email: Kay.Diederichs@uni-konstanz.de Tel +49 7531 88 4049 Fax 3183
Fachbereich Biologie, Universität Konstanz, Box M647, D-78457 Konstanz

CCP4bb navigation

CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

Previous message:
Subject: how to convert matrix to angle
From: Jiamu Du jiamudu {- at -} GMAIL {- dot -} COM
Date: 2007-07-07

Next message:
Subject: Kay Diederichs Email
From: James Stroud jstroud {- at -} MBI {- dot -} UCLA {- dot -} EDU
Date: 2007-07-07