Hi, GROMACS users: <br>I'm trying to calculate the lifetime distribution between pairs of vectors.<br>The
problem can be simplified as: there are many vectors in any one frame
of a MD trajectory, and when one vector is within a cutoff distance
with another vector, and their angle is larger than a cutoff angle,
they're deemed as a pair. Some pairs may break and reform in a short
time and should be considered something like "interrupted HB" as David
van der Spoel has discussed. <br>This is quite like the calculation of hydrogen bond lifetime, but I haven't figured it out. <br>Thank you in advance. <br><br>DJ