Hi, You can also use LSQKAB in CCP4 to get the angle between two similar domains.
-Debanu. -----Original Message----- From: CCP4 bulletin board on behalf of Kay Diederichs Sent: Sat 7/7/2007 7:30 AM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] how to convert matrix to angle 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: [EMAIL PROTECTED] Tel +49 7531 88 4049 Fax 3183 Fachbereich Biologie, Universität Konstanz, Box M647, D-78457 Konstanz
