[Ifeffit] Importance and Edge Step

[Barton, David (DG)]

Bruce,

thanks for the info..

When referring to the Edge Step feature you mentioned that:
 "You can type in a number, as before"

This does not appear to be working, if I check "Fix Step", enter a value into the edge step window, and then recompute the background, the value of the edge step reverts back to the automatic value.

Dave

> -----Original Message-----
> From: ifeffit-bounces at millenia.cars.aps.anl.gov 
> [mailto:ifeffit-bounces at millenia.cars.aps.anl.gov] On Behalf 
> Of Bruce Ravel
> Sent: Thursday, June 02, 2005 3:00 PM
> To: XAFS Analysis using Ifeffit
> Subject: Re: [Ifeffit] Importance and Edge Step
> 
> 
> On Thursday 02 June 2005 13:06, Barton, David (DG) wrote:
> > I noticed two new features in Athena 0.8.040 and am unsure 
> of how to 
> > use them.  The new features are "Importance" and "Edge Step".  I 
> > attempted to use the Edge Step feature by checking "Fix 
> Step" and then 
> > entering a value, but the Edge Step always reverts back to the 
> > automated value.  However, when I use the Increase/Decrease buttons 
> > (Left/Right arrow in Edge Step
> > window) the edge step does change, but it only changes in 
> increments of
> > 0.01 which is much too large for my datasets.  Is there 
> something I am
> > missing here?
> >
> > Also, I couldn't locate Bruce's changelog for Athena so I 
> am unsure of 
> > what the new "Importance" feature does.  Anyone used this 
> new feature 
> > yet?
> 
> 
> Importance:
>   This number is used only in a merge and only when the 
> "Weight by importance"   
>   button in the Merge menu is checked.  It's intention is to allow 
>   user-specified weights in a merge.  If you trust one data 
> set twice as much 
>   as another, the more trusted one might be given an 
> importance of 2 while the 
>   other is given an importance of 1.  This was in response to 
> a feature 
>   request -- personally I am not clear how would know how to 
> weight different
>   data sets. 
> 
> Edge step:
>   I got a request for a quick way to play around with the 
> size of the edge 
>   step.  When the "fix step" button is checked, you can then 
> specify an edge 
>   step which will then be used to normalize the data.  You 
> can type in a 
>   number, as before, or you can tweak the edge step up or 
> down.  You can set  
>   the size of the tweak in the preferences using 
> bkg->step_increment.  Note 
>   that if the "fix step" button is not checked, the edge step will be 
>   recomputed every time the background is recalculated.
> 
> And I do need to be more conscientious about updating the 
> change logs.  Sorry.
> 
> B
> 
> -- 
>  Bruce Ravel  ----------------------------------- bravel at anl.gov  -or-
>                                                   
> ravel at phys.washington.edu  Environmental Research Division, 
> Building 203, Room E-165
>  Argonne National Laboratory         phone and voice mail: 
> (1) 630 252 5033
>  Argonne IL 60439, USA                                fax: 
> (1) 630 252 9793
> 
>  My homepage:    http://feff.phys.washington.edu/~ravel 
>  EXAFS software: 
> http://feff.phys.washington.edu/> ~ravel/software/exafs/
> 
> 
> 
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