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Thanks. I think this is the specific method you want to use… http://java.freehep.org/freehep-physics/apidocs/hep/physics/vec/VecOp.html#add%28hep.physics.vec.HepLorentzVector,%20hep.physics.vec.HepLorentzVector%29 On Jun 18, 2014, at 11:03 AM, Sho Uemura <[log in to unmask]> wrote: > http://java.freehep.org/freehep-physics/apidocs/hep/physics/vec/VecOp.html > > On Wed, 18 Jun 2014, McCormick, Jeremy I. wrote: > >> Anyone have a good answer for this? >> >> On Jun 18, 2014, at 10:25 AM, Rafayel Paremuzyan <[log in to unmask]> wrote: >> >>> Dear jeremy, >>> >>> I am running a very simple code over Mock Data, >>> and now I am trying to get Lorentz Vectors of two MCParticles, and >>> reconstruct their invariant mass. >>> >>> In the following documentation >>> http://www.lcsim.org/sites/lcsim/apidocs/index.html >>> I found a method "asFourVector" which returns "HepLorentzVector" type >>> object, >>> however looks like "HepLorentzVector" has very limited methods, and in >>> particular I didn't >>> find a way to sum two "HepLorentzVector"s. >>> >>> There is also another class "Lorentz4Vector" which has much more methods >>> including the sum. >>> Now I am not sure how to get Lorentz4Vector from MCParticle. >>> >>> Is there a simple way of doing that? >>> >>> Rafayel >>> >> >> ######################################################################## >> Use REPLY-ALL to reply to list >> >> To unsubscribe from the HPS-SOFTWARE list, click the following link: >> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1 >> ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1