Merge pull request #43 from gaskelld/master

Add information about how to generate ntuples/root trees

README.md

@@ -4,6 +4,26 @@ simc_gfortran - Hall C/A Physics Monte Carlo
 SIMC (simc_gfortran) is the standard Hall C Monte Carlo for
 coincidence reactions, written in FORTRAN.
 
+SIMC has recently been modified to remove all explcit dependence on 
+CERNLIB.  There are now 3 ways to generate output for SIMC.
+
+1. Run simc as normal (use "run_simc" script or interactively).  This will 
+generate a fortran ".bin" file in the worksim directory. Probably not too 
+useful unless your analysis code is in fortran.
+
+2. Run simc and then use the helper application to convert the default output
+to a PAW ntuple (NOTE: this WILL require use of cernlib - on the JLab 
+machines type "setup cernlib/2005"). The helper application is in util/ntuple 
+and must be compiled separately from simc.  Running SIMC + the ntuple 
+application can be done in one command using "run_simc_ntup".
+
+2. Run simc and then use the helper application to convert the default output
+to a root tree (this program is also  in fortran, but cernlib is not needed). 
+The helper application is in util/root_tree and must also be compiled 
+separately from simc.  Running SIMC + the root-tree application can be done 
+in one command using "run_simc_tree".
+
+
 Features
 --------