[gmx-users] g_rms: Too many iterations in routine JACOBI

David van der Spoel spoel at xray.bmc.uu.se
Sat Jan 24 12:33:18 CET 2009


nishtha pandey wrote:
> Hello,
>         The molecule is not planar it is 3D. Also I would like to 
> mention that the same reference structure gave me result earlier.  I 
> chose protein as group for least square fit and CA for RMSD calculation.
> Thanks and regards,
try extracting the trajectory frame at the time point where it is going 
wrong and use g_confrms (it uses the same algorithm).
The reference structure is not the problem, it is the other one (most 
likely). Maybe your simulation crashed.

> Nishtha
> 
> On Sat, Jan 24, 2009 at 4:51 PM, David van der Spoel 
> <spoel at xray.bmc.uu.se <mailto:spoel at xray.bmc.uu.se>> wrote:
> 
>     nishtha pandey wrote:
> 
>         Hi,
>            Thank you for your response. It is a protein molecule
>         containing 610 amino acid residues.
> 
> 
>     you didn't answer my question.
>     please inspect the molecular structure at the time point where the
>     error  occurs.
> 
>         Thanks and regards,
>         Nishtha
> 
> 
>         On Sat, Jan 24, 2009 at 4:37 PM, David van der Spoel
>         <spoel at xray.bmc.uu.se <mailto:spoel at xray.bmc.uu.se>
>         <mailto:spoel at xray.bmc.uu.se <mailto:spoel at xray.bmc.uu.se>>> wrote:
> 
>            nishtha pandey wrote:
> 
>                Hello everyone,
>                                    While trying to do the RMSD analysis
>         of my
>                trajectory file I am facing the error " Too many
>         iterations in
>                routine JACOBI". I have gone through the archives which
>         suggests
>                that such problem arises if there is mismatch between the
>                reference structure and trajectory. However in my case the
>                problem lies somewhere else because, using the same .tpr file
>                and .trr file I have done RMSD analysis earlier also and it
>                worked fine.  The g_rms program is giving error but, for the
>                same set of input files g_rmsdist is working fine.
> 
>            g_rmsdist doesn't use lsq fitting.
> 
>            Is you molecule linear or planar? (i.e. not 3D)?
> 
>                       Kindly help.
>                Regards,
>                Nishtha
> 
> 
>              
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>            --    David van der Spoel, Ph.D., Professor of Biology
>            Molec. Biophys. group, Dept. of Cell & Molec. Biol., Uppsala
>         University.
>            Box 596, 75124 Uppsala, Sweden. Phone:  +46184714205. Fax:
>         +4618511755.
>            spoel at xray.bmc.uu.se <mailto:spoel at xray.bmc.uu.se>
>         <mailto:spoel at xray.bmc.uu.se <mailto:spoel at xray.bmc.uu.se>>    
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>     -- 
>     David van der Spoel, Ph.D., Professor of Biology
>     Molec. Biophys. group, Dept. of Cell & Molec. Biol., Uppsala University.
>     Box 596, 75124 Uppsala, Sweden. Phone:  +46184714205. Fax: +4618511755.
>     spoel at xray.bmc.uu.se <mailto:spoel at xray.bmc.uu.se>  
>      spoel at gromacs.org <mailto:spoel at gromacs.org>   http://folding.bmc.uu.se
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-- 
David van der Spoel, Ph.D., Professor of Biology
Molec. Biophys. group, Dept. of Cell & Molec. Biol., Uppsala University.
Box 596, 75124 Uppsala, Sweden. Phone:	+46184714205. Fax: +4618511755.
spoel at xray.bmc.uu.se	spoel at gromacs.org   http://folding.bmc.uu.se



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