CCL: autocorrelation for dihedrals

[h0159cap - at - rz.hu-berlin.de (Frank Eisenmenger)]

 Hi All,
 during conformational analysis of peptides the following question occurred:
 given a (time-)series of conformations for a linear,four-atom molecule
 described by one dihedral angle (=tau, range 180 ... +180)
 How calculate the autocorrelation function for tau, taking into account the
 "cyclic" behaviour of dihedrals ?
 Thanks for your ideas,
 Frank Eisenmenger
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