A Simple Example: Event Selection

Suppose we want to select GTIDs 1,2,3,4 from run 111111 and GTIDs 5,6,7,8 from run 222222. This can be done by hand using a DARN bank. For example we could create darn_7.dat containing:-

*DO   DARN         7 -i(30I -I) 
#.
#.    Standard Database Header with infinite validity 
19750101        0 20380517 03331900  
       0        0        0           
19990819  6580000        0           
19750101        0 20380517 03331900  
       0        0                    
4*0                                  
10*0                                 
#.       Start of DARN bank data.
#.
         1          #. Version number
         0          #. Compression algorithm
8*0                 #. Spare
#.

-111111 1 1  #.Start run 111111, applied mask=1, result mask=1
1 2 3 4

-222222 1 1  #.Start run 222222, applied mask=1, result mask=1
5 6 7 8

Observe the following rules when creating DARN banks in this way:-

• Do not duplicate run numbers i.e. put all the GTIDs for a single run in the same run record of the bank. The run sections can come in any order, although it makes sense to place them in ascending order.

• Do not duplicate GTIDs in a single run. For ease of checking it is as well to sort them into ascending order, although DMM will do this on input if it has to.

DMM can be asked to check that these rules have been followed, see section 10.4.5.

To copy just these GTIDs from input to output just requires the PEL:-

call inp
call dmm(7)
call out

Warning: this also strips off all permanent banks. If you want to keep them then construct a filter, for example:-

$enable_test 7 
$define_test 7 $line_1 '_ok_7     dmm  7;                   '  
$define_test 7 $line_1 '_is_perm  bits MAST+0,$KMAST_PERM,1;' 
$define_test 7 $line_1 'test      or   _ok_7, _is_perm;'

and then:-

call inp
call flt(7)
call out