Hello Tanya--

>
> I am trying to run dynamics of DNA oligo ( 11 mer) with explicit water
> molecules ( about 3000 molecules).
>
> Shake routine is :
>
> shake
>         reference = parameters
>         bonds (hydrogen) (all)
>         tolerance = 1.0e-06
>         nconstraints=8000
>
> end
>
> and error message after this is:
> **********************************
>
> X-PLOR>shake
>  SHAKE>        reference = parameters
>  SHAKE>        bonds (hydrogen) (all)
>  SELRPN:   7142 atoms have been selected out of  11032
>  SELRPN:  11032 atoms have been selected out of  11032
>  SHKSET: reference = parameters
>  %XREFIN-ERR: allocation for SHAKE-constraints exceeded
>               increase NCON parameter and run again

Does it help if you place an additional
    nconstraints=8000
line at the later location (where the error occurs)?

best regards--
Charles
--
Charles Schwieters     email:   [email protected]
                       www:     http://schwieters.org/cds
phone: (301) 402-4914  PGP key: http://schwieters.org/cds/pgp.txt

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