Difference between revisions of "FSRoot"

From GlueXWiki
Jump to: navigation, search
Line 21: Line 21:
 
== Here is a working example: ==
 
== Here is a working example: ==
  
(1) Flatten an analysis tree:
+
1. Flatten an analysis tree:
  
 
   > flatten -in /u/home/remitche/FSRootExample/analysis.root -out flat.root
 
   > flatten -in /u/home/remitche/FSRootExample/analysis.root -out flat.root
  
(2) Make a plot of the eta' mass:
+
2. Make a plot of the eta' mass:
  
 
   root>  FSHistogram::getTH1F("flat.root","ntFSGlueX_100_221","MASS(2,3,4,5,6)","(80,0.8,1.2)","")->Draw()
 
   root>  FSHistogram::getTH1F("flat.root","ntFSGlueX_100_221","MASS(2,3,4,5,6)","(80,0.8,1.2)","")->Draw()

Revision as of 11:38, 10 December 2021

FSRoot is an alternative to DSelectors that uses flat trees.


There are two steps:

1. Use FlattenForFSRoot (hd_utilities/FlattenForFSRoot/flatten) to generate flat trees from the standard analysis trees.

 >  flatten -in [input file with analysis tree] -out [output file with flat tree]
  • Run flatten with no flags to see further run options.
  • This should work for data, reconstructed MC, and thrown MC.
  • See the FlattenForFSRoot/Documentation directory for more information.


2. Use FSRoot (available at https://github.com/remitche66/FSRoot) to make histograms from the flat trees.


Here is a working example:

1. Flatten an analysis tree:

 > flatten -in /u/home/remitche/FSRootExample/analysis.root -out flat.root

2. Make a plot of the eta' mass:

 root>  FSHistogram::getTH1F("flat.root","ntFSGlueX_100_221","MASS(2,3,4,5,6)","(80,0.8,1.2)","")->Draw()