Re: [ccp4bb] how to convert matrix to angle

[Kay Diederichs]

Jiamu Du schrieb:

Dear all:

Thanks.

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 ?

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: [EMAIL PROTECTED]  Tel +49 7531 88 4049 Fax 3183
Fachbereich Biologie, Universität Konstanz, Box M647, D-78457 Konstanz

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