Ntuple SCAN and the use of simple selection criteria
                                                      
      hi/file 2 rwn_aptuple.hbook                                                                                       
      hi/file 3 cwn_aptuple.hbook                                                                                       
4     ALIAS/CREATE DIVEP 5                                                                                       
      alias/create NATFR 7                                                                                              
      cd //pawc                                                                                                         
      *                                                                                                                 
1 2   NT/SCAN //LUN2/10 nation=NATFR.and.division=DIVEP _                                                        
      ! ! ! age service children grade nation                                                                           
1 2   NT/SCAN //LUN3/11 nation='FR'.and.division='EP'  _                                                         
      ! ! ! age service children grade nation                                                                           
      *                                                                                                                 
      hi/cr/1d 200 'Number of years at CERN' 35 0. 35.                                                                  
      max 200 250                                                                                                       
      set ndvx 507                                                                                                      
      set htyp 235                                                                                                      
3     NT/PL //LUN2/10.SERVICE IDH=200                                                                            
5     ATITLE 'Years at CERN' 'Number of staff'                                                                   
      set htyp 253                                                                                                      
2 3   NT/PL //LUN3/11.SERVICE NATION='FR' OPTION=S IDH=200                                                       
      set htyp 250                                                                                                      
      nt/pl //LUN3/11.Service division='EP'.and.nation='FR' OPTION=S IDH=200                                            

1. NT/SCAN prints in an alphanumeric way the content of an Ntuple. On the next page is given the output of this command both for RW and CW Ntuples.
2. In the commands NT/PLOT and NT/SCAN , the second parameter is the selection criteria. Only the events satisfying this selection are taken into account. Note that with CWN character strings can be used.
3. By default NT/PLOT fill an histogram with the indentifier IDH=1000000 . The next invocation of this command will overwrite the content of this histogram. IDH may have been created with H/CREATE . Before filling IDH , the contents of IDH are reset if IDH already exists. Note that IDH not equal to 1000000 is a convenient way to force user binning. This is used here. We'll see later another way to fill an histogram with data read in an Ntuple.

   Note also:

4. The list of variable to be scanned may contain a list of the original variables, expressions of the original variables or/and ranges of variables. A range can be given in the following form:

                                                                                                                      
       :          means all variables (default).                                                                           
       var1:var2  means from variable var1 to variable var2 included.                                                      
       var1:      means from variable var1 to the last.                                                                    
       :var2      means from variable 1 to variable var2                                                                   
   

5. The aliases allow to define shortcut abbreviations. The aliases are known globally e.g. in all macros and in command mode.
6. ATITLE allows to define the title on the axis.

NT/SCAN output for a Row Wise Ntuple
                                                                      
 +-------+-------------+-------------+-------------+-------------+-------------+                                        
 | ENTRY |   AGE       |   SERVICE   |   CHILDREN  |   GRADE     |   NATION    |                                        
 +-------+-------------+-------------+-------------+-------------+-------------+                                        
 |    48 |   56.000    |   34.000    |   .00000E+00|   7.0000    |   7.0000    |                                        
 |   194 |   62.000    |   27.000    |   .00000E+00|   7.0000    |   7.0000    |                                        
 |   213 |   56.000    |   26.000    |   .00000E+00|   6.0000    |   7.0000    |                                        
 |   214 |   45.000    |   26.000    |   .00000E+00|   6.0000    |   7.0000    |                                        
 |   216 |   56.000    |   19.000    |   .00000E+00|   5.0000    |   7.0000    |                                        
 |   266 |   63.000    |   26.000    |   .00000E+00|   13.000    |   7.0000    |                                        
 |   267 |   59.000    |   32.000    |   .00000E+00|   13.000    |   7.0000    |                                        
 |   273 |   55.000    |   26.000    |   1.0000    |   12.000    |   7.0000    |                                        
 |   275 |   53.000    |   26.000    |   1.0000    |   11.000    |   7.0000    |                                        
 |   279 |   51.000    |   30.000    |   .00000E+00|   6.0000    |   7.0000    |                                        
 |   315 |   56.000    |   25.000    |   .00000E+00|   8.0000    |   7.0000    |                                        
 |   318 |   64.000    |   26.000    |   .00000E+00|   6.0000    |   7.0000    |                                        
 |   320 |   49.000    |   26.000    |   .00000E+00|   6.0000    |   7.0000    |                                        
 |   327 |   59.000    |   19.000    |   .00000E+00|   5.0000    |   7.0000    |                                        
 |   328 |   51.000    |   25.000    |   .00000E+00|   5.0000    |   7.0000    |                                        
 +-------+-------------+-------------+-------------+-------------+-------------+                                        
More...? ( /N/G ) n                                                                                                 
 ==>     15 events have been scanned                                                                                    

NT/SCAN output for a Column Wise Ntuple
                                                                   
 +-------+-------------+-------------+-------------+-------------+-------------+                                        
 | ENTRY |   AGE       |   SERVICE   |   CHILDREN  |   GRADE     |   NATION    |                                        
 +-------+-------------+-------------+-------------+-------------+-------------+                                        
 |    48 | 56          | 34          | 0           | 7           | FR          |                                        
 |   194 | 62          | 27          | 0           | 7           | FR          |                                        
 |   213 | 56          | 26          | 0           | 6           | FR          |                                        
 |   214 | 45          | 26          | 0           | 6           | FR          |                                        
 |   216 | 56          | 19          | 0           | 5           | FR          |                                        
 |   266 | 63          | 26          | 0           | 13          | FR          |                                        
 |   267 | 59          | 32          | 0           | 13          | FR          |                                        
 |   273 | 55          | 26          | 1           | 12          | FR          |                                        
 |   275 | 53          | 26          | 1           | 11          | FR          |                                        
 |   279 | 51          | 30          | 0           | 6           | FR          |                                        
 |   315 | 56          | 25          | 0           | 8           | FR          |                                        
 |   318 | 64          | 26          | 0           | 6           | FR          |                                        
 |   320 | 49          | 26          | 0           | 6           | FR          |                                        
 |   327 | 59          | 19          | 0           | 5           | FR          |                                        
 |   328 | 51          | 25          | 0           | 5           | FR          |                                        
 +-------+-------------+-------------+-------------+-------------+-------------+                                        
More...? ( /N/G ) n                                                                                                 
 ==>     15 events have been scanned