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Sorry the FAQ is so far out of date and the Wiki doesn't have such info.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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