RE: [Ifeffit] Importance and Edge Step

2 Jun 2005

      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@millenia.cars.aps.anl.gov
[mailto:ifeffit-bounces@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@anl.gov  -or-
ravel@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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Barton, David (DG)

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