On 9/04/2012 3:22 PM, ramesh cheerla wrote:
Dear Gromacs users,
I am planing to simulate a polymeric
crystal in gromacs, which is of monoclinic unit cell with cell
parameters a = 0.805 nm b = 1.304 nm and c = 1.948 nm and beta = 125.4
deg. my crystal is of 424 type i.e 4 unit cells along 'a' direction
'2' unit cells along 'b' direction and 4 unit cells along 'c' direction.
So my box vector lengths are a = 3.22 nm, b = 2.608 nm, c = 7.792 nm.
I am using editconf to generate box for this crystal as:
editconf -f input.gro -o out_box.gro -bt tric -box 3.22 2.608 7.792
-angles 90 125.4 90
Here i have some doubts:
1) Am i using the editconf in correct manner for generation of box for
the monoclinic crystal, though the crystal is of monoclinic i am
using box type as triclinic
i haven't found any specific method for the generation of box for the
monoclinic crystal.
2) Is there any specific method to generate the box for the monoclinic
crystals.
3) The notations for the lattice parameters of the crystal i.e 'a' ,
'b' , 'c' and angles alpha, beta , gamma used by crystallography and
the gromacs editconf are the same or different, why because if i use
editconf as above i am getting the following warning:
WARNING: Triclinic box is too skewed.
This means equation 3.3 of the manual is not true. Maybe beta should be
acute? I've no idea of necessity or convention here.
Inspecting the whole output of editconf is probably instructive, but
you've kept all that information to yourself instead of re-thinking how
your repeat post might be constructed so as to make it easier / more
likely for people help you. Likewise the final line of out_box.gro. Make
sure you have read and understood what documentation is available with
editconf -h and in manual section 3.2.
Mark
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