Sara baretller wrote:
I have a question about the g-hbond selection . after i typed in the g_hbond , it asked me to choose two groops and i am wondering what is difference between Protein and Protein-H ?


http://www.gromacs.org/Documentation/Terminology/Default_Index_Groups

-Justin

Thank you

Specify 2 groups to analyze:
Group     0 (         System) has  7722 elements
Group     1 (        Protein) has  2000 elements
Group     2 (      Protein-H) has  2000 elements
Group     3 (        C-alpha) has     0 elements
Group     4 (       Backbone) has     0 elements
Group     5 (      MainChain) has     0 elements
Group     6 (   MainChain+Cb) has     0 elements
Group     7 (    MainChain+H) has     0 elements
Group     8 (      SideChain) has  2000 elements
Group     9 (    SideChain-H) has  2000 elements
Group    10 (    Prot-Masses) has  2000 elements
Group    11 (    non-Protein) has  5722 elements
Group    12 (          Other) has  5722 elements
Group    13 (              W) has  5722 elemen




On Thu, Jul 14, 2011 at 11:10 PM, Mark Abraham <[email protected] <mailto:[email protected]>> wrote:

    On 15/07/2011 11:48 AM, Itamar Kass wrote:

        Hi all,

        I am trying to find all possible h-bonds between chains in my
        complex. I am using:

        g_hbond_d -f system_run1_MD050_fitbb.xtc -s system_for_EM.tpr -n
        system.ndx -g system_run1_MD050_fitbb_Hbond___all.log -num
        system_run1_MD050_fitbb_Hbnum___all.xvg -hbn
        system_run1_MD050_fitbb.xtc___Hbond_all.ndx

        and after reading 100ns the system crash and report:

        Reading frame    1000 time 100000.000   g_hbond_d(42677) malloc:
        *** error for object 0xd: pointer being reallocated was not
        allocated
        *** set a breakpoint in malloc_error_break to debug

        I am suing gromacs 4.0.7 (double precision) on mac (10.6.8),
        which I compiled myself (not via fink). I also tried to compile
        it using dmalloc without success.


    Sounds like a bug. Try g_hbond from a more recent version of GROMACS.

    BTW, you should only compile and use tools in double precision if
    that extra accuracy is what you actually need. Otherwise you're just
    running slower than you need to. All tools can read files written at
    either precision.

    Mark

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--
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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