1)When I want to calculate the radial distribution function of the polymer melts,but because the RDF is not computed for distances longer than the force cutoff,then if I want an RDF for larger distance,what measures in detail I should take?
2)The code “fix msd command” is to computer the mean-squared displacement of the group of atoms every N steps,then when I want to study the mean-squared displacement of the polymer density melt (averaging over all the chains rather than all the atoms),what should I do? Can you give me some advice?(The code "fix gyration command"has the same problem.)
Thank you very much!