On Fri, Oct 14, 2016 at 6:54 AM, Bruce Ravel <bra...@bnl.gov> wrote:
> On 10/13/2016 05:17 PM, Dimitar Popmintchev wrote:
>> I would like to ask, after a fit (in Artemis) which column in the output
>> file gives the uncertainty for peaks position dR (R+/-dR i.e. 3+/-0.02
>> Angstroms) ?
> Error bars are not propagated in Artemis currently. That's something you,
> the user, has to do using the math expression that relates your variable(s)
> to the delta R in question.
> The simplest common case is one where you have
> guess delr = 0
> then later, for some path,
> reff = 3.0
> deltaR = delr
> In that case, delr is varied and the path length is 3.0 + delr.
> Propagating the uncertainty in this case is trivial:
> delta( 3.0 + delr) = delta(3.0) + delta(delr)
> 3.0 is a constant, so the error bar in the path length is the same as the
> error bar in the variable.
> Bruce Ravel ------------------------------------ bra...@bnl.gov
> National Institute of Standards and Technology
> Synchrotron Science Group at NSLS-II
> Building 743, Room 114
> Upton NY, 11973
> Homepage: http://bruceravel.github.io/home/
> Software: https://github.com/bruceravel
> Demeter: http://bruceravel.github.io/demeter/
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