Hello again,
Apropos my previous request for help with JetFinder...
{One of the advantages of being 9 hours ahead... I can answer some (only some) of my own questions before you all wake up.}

By explicitIy using hep.physics.jets.AbstractJetFinder etc. I can get JetFinder to work with fastMC tracks
Enumeration fastMCe = event.getTrackList().getTracks();
jetFinder.setEvent(fastMCe);

(I still have some problems using the Predicate.. though explicitly casting the Object to a Track then get the associated MCParticle
it seems to work - is this the right approach?)

How do I do jet finding with both charged and neutral "tracks" since LCDEvent seems only to provide these separately?

If I try the same thing with MCParticles directly such as (mimicking the example):

   ParticleVector pv2 = event.getMCParticles();
   jetFinder2.setEvent(pv2.particles());
   histogram("Njets2").fill(jetFinder2.njets());

It no longer complains about not passing IHep3Vectors but it gives the error:

java.lang.ArrayStoreException:
at java.util.Vector.copyInto(Vector.java)
at hep.physics.jets.AbstractJetFinder.doFindJets(AbstractJetFinder.java:168)
at hep.physics.jets.AbstractJetFinder.njets(AbstractJetFinder.java:51)
at MCCheck.process(FastMC_anal01.java:269)

As usual, any help or suggestions will be gratefully received.

Bob

-- 
Robert J. Wilson
Professor of Physics
Department of Physics
Colorado State University
Fort Collins, CO 80523
Phone:  (970) 491 5033
Fax:     (970) 491 7947
Email: [log in to unmask]

August 2000 - July 2001:
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Institut de Fisica d'Altes Energies
Universitat Autonoma de Barcelona
E-08193 Bellaterra (Barcelona)
SPAIN
Phone: (011 34) 93 581.28.32
Email: [log in to unmask]
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