CERN Program Library Long Writeup W5013 - CERNLIB ...

Geant 3.16 GEANT User’s Guide BASE040
Origin : Submitted: 01.10.84
Revision : Revised: 16.12.93
Documentation : F.Bruyant, M.Maire
1 Introduction
Summary of Data Records
GEANT uses the FFREAD [7] package to read free format data records in the routine GFFGO. The keywords
accepted by GFFGO can be classified as:
1. general control of the run;
2. control of the physics processes;
3. debug and I/O operations;
4. user applications;
5. Lund event generation.
The data records are listed below by category with the following information:
KEY
N
T
keyword, any number of characters truncated to the first 4 unless otherwise specified by the user;
maximum expected number of variables (NVAR);
type of these variables (I=INTEGER, R=REAL or M=MIXED) and for each variable in turn:
•variable FORTRAN name;
•short description (more detail in [ZZZZ010]);
•labelled common where it is stored;
•default value, usually from GINIT.
When a record is decoded, the values entered by the user in free format are assigned to the variables in order.
The number of values can be less than NVAR. In case of a MIXED type the values entered have agree with the
type of the corresponding variable.
For example the data record:
RUNG 5 201
presets the run and event number to 5 and 201 respectively. None of the records mentioned below is mandatory.
2 User defined data records
Before calling GFFGO the user may define private data records through calls to FFKEY as follows:
CALL FFKEY(’key’,VAR(1),NVAR,’type’)
They will be interpreted by GFFGO in the same way as the GEANT pre-defined records.
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