[Ifeffit] Fe B standard

[Marco A. Alsina]

Not so long ago I also did data mining at the Farrel Lytle database, and 
  here is what I found based on typical values for common faces of Si 
crystal and step per degree values;

CUEDGE	dspace	stpdeg	energy
42147	1.92017	2000	8978.950759
84294	1.92017	4000	8978.950759
50880	3.13562	4000	8979.010145
168620	1.92017	8000	8977.324319
183931	0.96008	4000	8978.996359
337234	1.92017	16000	8977.476771

This should help when someone encounter data files where the dspace or 
stpdeg entries are missing, and of course fot the macro you will also 
need to set dspace as a variable;
Too bad that macros doesnt support "if then" conditionals statemens

macro read_lytle file group 1.92017 8000
read_data ($1, group=$2, narrays=2)
set (dspace  = $3,     stpdeg  = $4)
set (r2d     = 57.29577951, hc      = 12398.61)
set $2.energy =  hc / (2 * dspace) / sin($2.1 / (r2d * stpdeg))
set $2.xmu    = $2.2
end macro

on 29/03/2006 17:23 Matt Newville wrote:
> I believe Marco's right,  and that you want a script like this:
> macro read_lytle file group 8000
>    read_data ($1, group=$2, narrays=2)
>    set (dspace  = 1.92017,     stpdeg  = $3)
>    set (r2d     = 57.29577951, hc      = 12398.61)
>    set $2.energy =  hc / (2 * dspace) / sin($2.1 / (r2d * stpdeg))
>    set $2.xmu    = $2.2
> end macro
> 
> read_lytle  beerbottle.dat
> 
> Sorry the FAQ is so far out of date and the Wiki doesn't have such
> info.  Perhaps someone else would be willing to write a How to Use the
> Lytle Database on the Wiki or (even better) convert all the data
> available to a more useful format.
> 
> --Matt
> 
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