[gmx-users] g_gyrate

[C. Batistakis]

Dear all

I have the following system. Substrate with 3696 particles and 4 polymer chains with 45 beads/chain.  After typing g_gyrate, I have the following option:

Group     0 (      System) has  680 elements
Group     1 (         ZZZ) has   500 elements
Group     2 (         AAA) has    45 elements
Group     3 (         BAA) has    45 elements
Group     4 (         CAA) has    45 elements
Group     5 (         DAA) has    45 elements
Select a group:

Can someone tell me how can I calculate the average radius of gyration 
only from the groups 2,3,4,5 of the previous system? 

Thanks in advance
Chrysostomos



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