[gmx-users] Re:Re: g_order in GROMACS 3.3.2 and 3.3.1

[林揚善]

Dear all GROMACS user :
    After generating the .ndx file which contained only one group that one tail of DPPC,
    I use g_order to calculate order parameters. But there are nothing in deuter.xvg and order.xvg file.
    The process is listed below:
    step1: make_ndx -f XXX.pdb -o index.ndx
             then type : a C17 C18 ... C31     (C31 is methyl and C17...C30 is methylene in one tail of DPPC lipid)
             then type : name 3 sn_1        (0 is for system, 1 is for DPPC, 2 is for SOL ) 
             then type : q

    step2 : delete all groups in the index.ndx except sn_1 group.

    step3 : g_order -f YYY.pdb -n index.ndx -s .tpr -od 

     Can someone tell me what wrong is in my process ?

         Thank you very much.             
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