thank you very much for the suggestion.

I have tried as you suggested, having random RDC values for residues 
16,29,31,39,48,53 of gb1. The result was the same. Converence with perfect 
correlation obs/calc without really violations.






________________________________________
From: [email protected] [[email protected]] on behalf of Gabriel 
Cornilescu [[email protected]]
Sent: Monday, October 24, 2016 11:18 PM
To: Emmanouilidis, Leonidas
Cc: [email protected]; Charles Schwieters
Subject: Re: [Xplor-nih] refine.py script handling off RDCs

That doesn't tell much,  it's equivalent to having a 6% larger alignment tensor 
and the fit has to be identical. Try to either scramble a few assignments or 
add/subtract a few Hertz from just a handful of RDCs to see a difference.

On Oct 24, 2016 3:52 PM, "Emmanouilidis, Leonidas" 
<[email protected]<mailto:[email protected]>> wrote:
by random I mean addition of 6Hz to all HN-N rdcs.




On Oct 24, 2016, at 10:43 PM, Gabriel Cornilescu wrote:


When you say random,  are you scrambling the assignments,  changing the RDC 
values randomly by 6%, or changing their associated errors?

On Oct 24, 2016 3:30 PM, "Emmanouilidis, Leonidas" 
<[email protected]<mailto:[email protected]>> wrote:
This is relative simple.
If one runs the tutorial-based gb1 RDC refinement protocol (refine.py) but with 
hn RDCs values completely random (+6Hz noise to each), the outcome is a 
seemingly successful refinement with no errors.
I did the test using just the hn RDCs.





On Oct 24, 2016, at 10:11 PM, Charles Schwieters wrote:

>
> Hello Leonidas--
>
>>
>> while I am trying to refine a crystal structure with RDCs using the
>> refine.py script, I came across a weird result.
>>
>> I had near perfect correlation between observed and calculated RDCs
>> values, which was fishy. After addition of 5Hz systematic noise to all
>> RDCs, i still had perfect correlation and nice convergence with no
>> violations(!). Initially i thought that there was something wrong with
>> my experimental setup (since i only used RDCs+dihedrals restrains),
>> but I had exactly the same result when I changed also the gb1 tutorial
>> RDCs values.
>> So to sum it up, I used the tutorial script (refine.py) and input
>> files for RDC refinement, regardless of how much I alter the RDCs
>> values (i tried up to +6Hz noise addition) I get always nice
>> convergence, perfect correlation obs/calc with no violations.
>>
>> Is this how it should be or do I miss/mess somthing?
>>
>
> Not sure what's going on- we'll need more details.
>
> best regards--
> Charles


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