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CERN Program Library Long Writeup W5013 - CERNLIB ...

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Geant 3.16 GEANT User’s Guide HITS399<br />

Origin : R.Brun Submitted: 01.11.83<br />

Revision : Revised: 18.12.93<br />

Documentation :<br />

The JDIGI data structure<br />

NSET ISET JDIGI<br />

NDET IDET JDIG NDET<br />

JDD<br />

1st digitisation<br />

2nd digitisation,etc.<br />

Figure 33: Layout of the JDIGI data structure<br />

JDIG=LQ(JDIGI-ISET) pointer to digitisations structure for set number ISET<br />

JDD=LQ(JDIG-IDET) pointer to digitisations of detector number IDET of set number<br />

ISET<br />

IQ(JDIG+IDET) pointer to last word of last digitisation for detector number IDET<br />

IQ(JDD+1)<br />

1 st word of 1 st digitisation<br />

IQ(JDD+N+1)<br />

1 st word of 2 nd digitisation<br />

JS=LQ(JSET-ISET) pointer to the structure containing the description of digitisations<br />

of set number ISET<br />

JD=LQ(JS-IDET) pointer to the structure containing the description of digitisations<br />

of detector number IDET<br />

NWD=IQ(JD+5) number of elements of digitisation of set/detector ISET/IDET<br />

NTRA<br />

number of tracks contributing to digitisation<br />

N=NWD+NTRA/2+1 N varies from digitisation to digitisation<br />

The JDIGI structure is filled with the routine GSDIGI. The routine GFDIGI can be used to get the digitisations<br />

for a detector IDET in set ISET.<br />

169 HITS399 – 1

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