The tricky part is that if you look at the first line in the file hbm.xpm you are looking at the bottom row of the matrix when displayed with gimp or after converting to xpm2ps. The same line corresponds to the first hbond in hbn.ndx. That sentence in the manual is therefore a bit ambiguous.

Erik

Carla Jamous skrev 2010-10-15 13.29:
I'm sorry I don't understand, because your last answer doesn't correspond to what's written in the manual. I'm using gromacs 4.0.3 and the manual says:

-hbm: existence matrix. Ordering is identical to that in -hbn index file.

And yes, my trajectory is concatenated the way I intended to, but I will check anyway.

Carla

On Fri, Oct 15, 2010 at 1:23 PM, Erik Marklund <er...@xray.bmc.uu.se <mailto:er...@xray.bmc.uu.se>> wrote:

     Carla Jamous skrev 2010-10-15 12.05:

        Hi everyone,


        please I need some help on g_hbond.

        I concatenated 3 trajectories. I ran g_hbond on the
        concatenated trajectory. I got the result of h_bonds.
        Then I wanted to run g_hbond on each of my 3 trajectories.
        Here, I get a different result, it means: if I take the first
        10ps of my concatenated trajectory and I run g_hbond on these
        10ps. I get some H-bonds eg. Gly(N)...H(gly)...O
                                              but this same H-bond
        doesn't appear in the first 10ps of my concatenated
        trajectory's HBmap.

        Please does anyone have an idea where I might have done a mistake?

        Thank you,
        Carla

    Have you confirmed that the concaternation was done the way you
    intended?


-- -----------------------------------------------
    Erik Marklund, PhD student
    Dept. of Cell and Molecular Biology, Uppsala University.
    Husargatan 3, Box 596,    75124 Uppsala, Sweden
    phone:    +46 18 471 4537        fax: +46 18 511 755
    er...@xray.bmc.uu.se <mailto:er...@xray.bmc.uu.se>
    http://folding.bmc.uu.se/

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--
-----------------------------------------------
Erik Marklund, PhD student
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,    75124 Uppsala, Sweden
phone:    +46 18 471 4537        fax: +46 18 511 755
er...@xray.bmc.uu.se    http://folding.bmc.uu.se/

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