Introduction

As you have already seen, SNOMAN can produce an N-tuple file that can be displayed in PAW. You can control the contents of the N-tuple file and hence can study every aspect of SNOMAN that can be deduced from the event data structure. Control is via two types of titles :-

NTPC - NTuPle Control

This bank provides overall control. The ONLY word that you should adjust is the print control flag and that will probably only be necessary if trying to diagnose problems.

NTPR - NTuPle Request

This bank defines a single N-tuple; you can create as many N-tuples as required simply by supplying an NTPR for each.

To help you get started the titles files come complete with an NTPC and several NTPRs. You are free to change the NTPR in anyway, but use a private copy! If you want to switch off, say, the NTPR 500 use the SNOMAN command:-

$disable_ntuple 500

which will clear its enable flag (see below).

A summary of the features available is as follows:-

• Without Relinking:-
  • Can define any number of N-tuples.

  • Each can be filled with any word of any data structure bank. Data can be directly copied or can be used as input to Standard Derived Quantity Functions (DQFs) which are then stored.

  • Results already stored in an n-tuple word can be used as input to later DQF calls in the same n-tuple.

  • Cuts of arbitrary complexity can be placed on an n-tuple, only those that pass are output.

  • Output histograms instead of, or as well as, the n-tuple. See section 6.8

  • Collapse the n-tuple into a single row, by summing the contents of each column. See section 6.9

• With Relinking:-
  • Can define new DQFs.

  • Can fill own N-tuples or update and veto standard ones.