Hello,
The SNO events are in an ASCII file. Both PAW NTuples and ROOT trees are
dumped in an ASCII file, and then used by QSNO to extract signal (people
that use PAW NTuples didn't want to convert in ROOT trees and vice-versa,
so it is the compromise). My class reads events in the ASCII file,
applies the cut and add it to a two-dimensions float array, this
information being given to another class after... If people want to define
a new cut, they add it to the dat file, and call the member function that
applies cut again.
Pierre-Luc Drouin
SNO, Carleton University
On Mon, 5 Aug 2002, Rene Brun wrote:
> Pierre-Luc,
>
> Did you look at TTreeFormula?
> We use this class to make cuts in ROOT TTrees.
> What is the format of your SNO events?
>
> Rene Brun
>
> On Mon, 5 Aug 2002, Pierre-Luc Drouin wrote:
>
> > Hi,
> >
> > I'm working on a program that reads equations in a dat file and use them
> > to apply cuts on some SNO events. Users must be able to change cut
> > equations in the dat file without recompiling QSNO (SNO analysis
> > program). Cuts may combine more than 4 parameters, that's why I need an
> > equation interpreter that can interpret formulas with more than 4
> > variables.
> >
> > Thank you!
> >
> > Pierre-Luc Drouin
> > SNO, Carleton University
> >
> > On Mon, 5 Aug 2002, Rene Brun wrote:
> >
> > > May be you should explain what you want to do !
> > > Why don't you use CINT directly as an interpreter?
> > >
> > > The convention in TFormula is to use the letters x,y,z,t
> > > to identify the 1st,2nd,3rd,4th dimension in the expression.
> > > For sure we could use the 26 characters + upper case.
> > > I don't think this would be the right way to proceed.
> > >
> > > Rene Brun
> > >
> > > On Mon, 5 Aug 2002, Pierre-Luc Drouin wrote:
> > >
> > > > Hi,
> > > >
> > > > The problem I have is that I'm making a class that must be the most
> > > > flexible as possible, and it's possible that it needs more than 4
> > > > variables (perhaps 10, or more). Is there a mean to do that using
> > > > TFormula? I mean, once an interpreter is able to interpret
> > > > complex equations like
> > > > TFormula is able to do, what does limit the number of variables?
> > > >
> > > > Thank you!
> > > >
> > > > Pierre-Luc Drouin
> > > >
> > > > On Mon, 5 Aug 2002, Rene Brun wrote:
> > > >
> > > > > Hi Pierre-Luc
> > > > >
> > > > > TFormula allows up to 4 dimensions. Example:
> > > > > root > TFormula f("f","x+y+z+t")
> > > > > root > double x[4] = {1,2,3,4}
> > > > > root > f.EvalPar(x)
> > > > >
> > > > > The current documentation indicates a max of 3 dimensions.
> > > > > I have updated the comments in the CVS version.
> > > > >
> > > > > Rene Brun
> > > > >
> > > > > On Mon, 5 Aug 2002, Pierre-Luc Drouin wrote:
> > > > >
> > > > > > Hello,
> > > > > >
> > > > > > I need an equation interpreter that can be used with more than 3
> > > > > > variables. Is there a class that allows it in ROOT?
> > > > > >
> > > > > > Thank you!
> > > > > >
> > > > > > Pierre-Luc Drouin
> > > > > >
> > > > >
> > > >
> > >
> >
>
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:51:03 MET