dihedral angle

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1

sir,
   sir i wanted to know about, how i will check in my system any dihedral
angle is present or not? and how i will calculate angle between atom ?

thank u

2

sir,
   sir i wanted to know about, how i will check in my system any dihedral
angle is present or not?

i don't understand the question.
is the about LAMMPS will see if you have a dihedral defined?
or is it about how you prepare input for it?

and how i will calculate angle between atom ?

http://en.wikipedia.org/wiki/Dihedral_angle

axel.