Compute several angles and dihedrals in a set of molecules
mol.angles.multi.Rd
This function acts on a read feather file Input is a character of either 3 or 4 atoms with atoms separated by a space (e.g. '1 2 3' or '1 2 3 4') and sets gathered in a vector (e.g. c('1 2 3', '1 2 3 4'))