AMBER Archive (2008)


From: Max (
Date: Wed Jul 02 2008 - 03:54:35 CDT

Dear Amber community,

I would like to ask if anybody knows the meaning of the numbers in the NONBONDED_PARM_INDEX array, included in the prmtop file. I use Amber 8, and the information about this array, provided in seems to be not correct in my case. In fact, the formula index = ICO(NTYPES*(IAC(i)-1)+IAC(j)) cannot explain the values I find in my NONBONDED_PARM_INDEX array. More generally speaking, the only thing I don't understand of the prmtop file is how the various couples of atom types are assigned to the elements included in the 6-12 parameter arrays (or 10-12 parameter arrays).

Thank you very much
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