Hall-D Software Meeting Minutes
July 27, 2004

D. Lawrence


Attendees: David L., Richard J., Elliott W. Sandy P., Franz K. Paul E.,
Ryan M.


Agenda:

1.) What should be the "official" format for vector (3 and 4) in-memory
storage and manipulation? Should we use vector3_t package? C++? etc..

A discussion of forming a standard for storing 3-vector and 4-vector
information in memory was made. There was no clear consensus and
no decisions were made on this issue.


2.) Adding complex structures as base types to HDDM.
A brief discussion was made as to whether we should extend HDDM to include
complex structures in addition to the base data types (+ Particle_t).
It was suggested that a concrete proposal be made on the forums before
a serious discussion can take place.


3.) CODA evio interface to HDDM
Elliott and Dave related some discussions they've been having about
CODA format and the evio package for reading/writing the format to disk.
Since the raw data is expected to be in CODA format, a evio based
input module will have to be written to put the data into HDDM. They
are considering making an output module at the same time which could
handle the complex structures defined in HDDM. They will report on
this work as it progresses.


4.) Improvements to portal
This topic was postponed to a later meeting where Zisis could be in on
the discussion.

5.) Genr8 
Paul was asked to describe some of the details on how genr8 works to
decay particles. Paul pointed to a Hall-D note on the topic, but 
briefly explained some of the details.
The discussion included whether or not we should change the particle
numbering scheme currently used by genr8 to use PDG numbers rather than
Geant numbers. Paul agreed to make the needed changes in HDFast and
Richard agreed to do it for HDGeant.