On Tuesday 11 of February 2014 22:24:21 Atsushi Togo wrote:
> I have a question though I'm not a crystallographer. What do you mean
> "Most of the conventions are the same, except for groups with Hall
> symbols B -2bc, R 3 -2", F 4d 2 3 and P 4 2 3 -1n"?

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.

> The choice of axes and origin are arbitrary. So one of equivalent
> space group is chosen. I don't remember if there is a rule or not in
> spglib.

As I understand it, the choice is indeed arbitrary, but the transformations 
involved change according to this choice. Thus, if OpenBabel uses a different 
choice than Spglib, we have a problem. Spglib always takes the entire cell 
into account so it should always work corretcly, but OpenBabel does not, it 
assumes the cell matches its own conventions. Do I understand correctly?

Regards,
Jure


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