Yes, right. As you wrote, spg_refine_cell put the cell into "an
appropriate state". There are several choices, but spgilb forces to
choose one of them.
A word "transformation" can be used to transform a setting (of axes,
origin, or centring) to another. So I need to make it clear.

Togo

On Wed, Feb 12, 2014 at 12:38 AM, Jure Varlec <jure.var...@ki.si> wrote:
> On Tuesday 11 of February 2014 22:54:55 Atsushi Togo wrote:
>> > I mean to say that for each of the _other_ spacegroups, the
>> > transformations
>> > given by spgdb_get_operation are the same as those given by OpenBabel.
>> > This is not so for the four spacegroups noted above.
>>
>> There are many similar words so I need to make it clear. Your
>> 'transformations' means a set of symmetry operations of a
>> space-group-type defined by a hall symbol? If so, spglib or Open babel
>> made mistake in decoding the hall symbols because the way to decode is
>> unique.
>
> I think we are getting closer to an understanding. Are you saying that when I
> specify a Hall symbol, I also implicitly specify a choice of origin etc. and
> there should not be any ambiguity left? If so, does spg_refine_cell put the
> cell into an appropriate state so that applying operations specified by the
> Hall symbol makes sense?
>
> Regards
> Jure
>
>
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-- 
Atsushi Togo
http://atztogo.github.com/
atz.t...@gmail.com

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