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DIALS-GENERAL  October 2015

DIALS-GENERAL October 2015

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Subject:

Re: Reindex

From:

Phil Evans <[log in to unmask]>

Reply-To:

Phil Evans <[log in to unmask]>

Date:

Thu, 1 Oct 2015 14:49:33 +0100

Content-Type:

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text/plain (49 lines)

I think tracking the CBO would be good. Sticking to the original indexing might cause all sorts of complications later, e.g. in refining minimal unit cell parameters 

Phil


> On 1 Oct 2015, at 14:41, <[log in to unmask]> <[log in to unmask]> wrote:
> 
> Hi Phil,
> 
> Thanks for the suggestions. I've never been particularly happy with the way the dials.reindex step fits in the process, but haven't been able to come up with a suitable alternative (other than to go back and re-run dials.index in the correct space group). Your suggestion of tracking the change of basis operator alongside the experiments.json and reflections does seem to have merit, although we would need to discuss internally exactly how to go about it.
> 
> Another alternative could be to output the bravais_setting_NN.json files in the same basis as the input, i.e. primitive setting, then they would be compatible with the original indexed.pickle without reindexing the reflection list. Then downstream programs like dials.refine could choose to optionally convert to the reference setting on input. Any thoughts on this workflow? When we eventually get around to the one-hdf5-file-to-rule-them-all version of DIALS that James is keen on, then hopefully these kinds of problems will go away.
> 
> Cheers,
> 
> Richard
> ________________________________________
> From: DIALS project general discussion [[log in to unmask]] on behalf of Phil Evans [[log in to unmask]]
> Sent: 01 October 2015 10:50
> To: [log in to unmask]
> Subject: Reindex
> 
> Following up on the Dials demo yesterday
> 
> The process is
> 
> 1) dials.index -> indexed.pickle
> 
> 2) dials.refine_bravais_settings -> bravais_setting_NN.json
> 
> choose a setting, then if necessary reindex
> 
> 3) dials.reindex indexed.pickle change_of_basis_op=a,b,c -> reindexed_reflections.pickle
> 
> followed by something like
> 4) dials.refine bravais_setting_9.json indexed.pickle scan_varying=true [ or reindexed_reflections.pickle]
> 
> however it seems to me that step 3 (a complication for pipelines, and a hazard for manual working)  could be incorporated into step 4. You know that indexed.pickle is in the “original” frame (and could usefully be internally stamped as such), and bravais_setting_NN.json does or should include the change of basis operator, so it could be applied automatically. This would be safer
> 
> Just a suggestion
> 
> Phil
> 
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