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) ?

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`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.`

HTH, B -- 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/ _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit