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Topic: Ntuple

In the News (Fri 24 May 19)

  Writing Large Ntuple Files
Note that the amount of space in PAWC is a multiple of the number of records and not of the number of ntuples.
All of this "hidden" overhead is a consequence of the decision to implement ntuple storage in the form of direct access files.
Since it assumes the user may wish to recover any arbitrary subset of these ntuples in the same job, that mapping is kept in memory in the dynamic store and space must be reserved for it.
cepa.fnal.gov /aps/cern/big-ntuples.shtml   (1311 words)

 Ntuple Descriptions   (Site not responding. Last check: 2007-11-03)
The three-body Ntuple is generated for events that are determined to be from the 3He(gamma,pp)n reaction.
The Ntuples that are generated by simulated data will not have the error values.
The two-body Ntuple is generated for events that are determined to be from the 3He(gamma,pd) reaction.
www.npl.uiuc.edu /~simon/compare/ntuple.html   (716 words)

 NTuple - DANSE
The NTuple class is the basic data abstraction used in HippoDraw.
NTuple overrides this with the more obvious behavior of just returning a reference to the specified std::vector< double>.
So NTuple is the primary class meant to model data.
wiki.cacr.caltech.edu /danse/index.php/NTuple   (381 words)

 GNU Scientific Library -- Reference Manual: Histogramming ntuple values   (Site not responding. Last check: 2007-11-03)
The selection function and the value function both accept the ntuple row as a first argument and other parameters as a second argument.
The selection function determines which ntuple rows are selected for histogramming.
should return a non-zero value for each ntuple row that is to be included in the histogram.
linux.duke.edu /~mstenner/free-docs/gsl-ref-1.0/gsl-ref_346.html   (212 words)

 adding a block to a CWN
By way of definition, a column-wise ntuple is a new style of ntuple that has data typing, compression (essentially bit packing) where appropriate, and variable length arrays, which are very useful for describing data.
What is more often needed is to add blocks to an existing ntuple that depend on data already in the ntuple.
The main problem is in reading data from an ntuple into a common block after a new "block" has been added to the ntuple.
www.hep.umn.edu /~mualem/e872/ntuple   (578 words)

 GNU Scientific Library -- Reference Manual - N-tuples   (Site not responding. Last check: 2007-11-03)
The values to be stored are held in a user-defined data structure, and an ntuple is created associating this data structure with a file.
This struct contains information on the file where the ntuple data is stored, a pointer to the current ntuple data row and the size of the user-defined ntuple data struct.
Further information on the use of ntuples can be found in the documentation for the CERN packages PAW and HBOOK (available online).
jamesthornton.com /gnu/gsl/gsl-ref_22.html   (634 words)

 Class parser.NTuple   (Site not responding. Last check: 2007-11-03)
NTuples are evaluated using the eval() methods of Parser.
An NTuple may evaluate to a String or Double, if it is scalar, or to a Vector, if it is multidimensional.
The elements of the Vector are guaranteed to be Strings or Doubles.
www.math.unl.edu /~jorr1/java/docs/parser.NTuple.html   (109 words)

 Get information about an Ntuple   (Site not responding. Last check: 2007-11-03)
If more than one row of the Ntuple is to be processed, it is more efficient to call first HGNPAR and then HGNF.
When accessing more than one row of an Ntuple it is more efficient to call HGNPAR and then HGNF for each row that is required than to call HGN.
If you analyse Ntuple data without, it is your own responsibility to find out and specify which are the columns referenced via the routines HGNTV or HGNTB (if all variables in a block are needed).
www.mppmu.mpg.de /Introduction/cernlib/hbook/section2_6_5.html   (794 words)

 [MSD] ntuple records
The user's ntuple records may be read in from one set of files in parallel from records of a different type from a second set of files, for example: { JobC j;...
The use of a TClonesArray to store ntuple list data is desirable because they are efficient, and because the data members of the objects stored in them will be split onto different branches of the root tree.
It is meant to be the ntuple partner for the RecoBase package and to provide organization to ntuple data entities that may be common to different reconstruction packages (SR, BubbleSpeak,etc.).
minos.phy.bnl.gov /list-archives/minos_software_discussion/2003-February/004011.html   (854 words)

An index variable allows the Ntuple to have a "variable-length" column, by treating the index variable as the number of entries in that column for this particular row.
When an Ntuple is part of a collection of Ntuples for each event, manager->clearAlliData() may be used to reject captured data for a whole event.
Retrieval of blocks and/or columns for Ntuples with Row-Wise storage is supported, but will not be much quicker than retrieving the entire row.
www-d0.fnal.gov /d0dist/dist/packages/HepTuple/devel/doc/html/HepNtuple.html   (1730 words)

An Ntuple is a matrix of n columns.
The Ntuple may be created either in memory or, if necessary, using an automatic overflow to an histogram file.
where `` nid '' is the Ntuple identifier (a number) and `` n '' is the number or the name of one of the variable in the Ntuple.
www-pnp.physics.ox.ac.uk /~west/paw/tut036.html   (362 words)

 An NTuple-Making Athena Algorithm
What is perhaps unusual is that the ntuple (named, perhaps unimaginatively, ntuple) is defined here, in the header file, as opposed to the.cxx file.
The answer is that the ntuple is actually part of the interface of JetPlot: it's part of how JetPlot communicates with the outside world, and the interface belongs in the header file.
After this, all that's left to do is to actually fill the ntuple, close all the loops, and write a blank finalize() method.
hep.uchicago.edu /atlas/usatlasmidwest/tutorials/NtupleAthena.htm   (1660 words)

First, the ntuple itself has to be defined in the form of a Jazelle bank template.
The typical application for a variable ntuple would be properties of particles in an event where what varies is the number of particles per event.
Note that the command sequences and arguments for creating row_wise ntuples using the Hxxx type of NTUPLE commands is somewhat different than that for column-wise ntuples.
www-sld.slac.stanford.edu /sldwww/ntuple.html   (1066 words)

 OSCAR ORCA and L1CaloTrigger
In this walkthrough we'll be starting with an ntuple file created by cmkin and running it through all the steps needed to finally create an ntuple file of the L1CaloTrigger information for the event.
Running the ORCA digitization output thru the L1CaloTrigger ntuple writer to produce a root file containing information from the L1CaloTrigger ORCA package as well as relevant generator level information for comparison.
If you have afs access there is a full 10000 event ntuple made from the EDDE generator available for use.
www.hep.wisc.edu /~wchogg/L1Tutorial.html   (687 words)

 Aod ntuple - AtlasWiki
The ntuples contain the full MC truth information ("truth") that is contained in the AOD.
For the T1 (ttbar) sample there is an additional block ("hardtruth") with the hard scatter information remade from the ESD by Eric Cogneras.
There are three collections of jets which are all stored in the ntuple.
www.nikhef.nl /pub/experiments/atlaswiki/index.php/Aod_ntuple   (1111 words)

 One-dimensional convolution of Ntuple
Action: Perform a one-dimensional convolution of the Ntuple with respect to an other
Ntuple identifier (this Ntuple can be 1-D or 2-D).
It is used as kernel for the convolution of
wwwasdoc.web.cern.ch /wwwasdoc/hbook_html3/node50.html   (168 words)

 Ntuple examples   (Site not responding. Last check: 2007-11-03)
Note how the constraints on the various variables shown in the table are expressed in the job when creating the Ntuple.
This skeleton is used in the example below to prepare a job for analysing the Ntuple data sample.
The summary table about the Ntuple shown below, as obtained by running the program above on the CERN Ntuple, should be compared with the table obtained during the creation run, as shown on page
www.mppmu.mpg.de /Introduction/cernlib/hbook/section2_6_6.html   (225 words)

A Ntuple is created via TNtuple(name,title,varlist,bufsize) It is filled via: TNtuple::Fill(*x) or TNtuple::Fill(v1,v2,v3.....)
Use this method when the addresses were changed via calls to SetBranchAddress().
*-*-*-*-*-*-*-*-*Fill a Ntuple with current values in fArgs*-*-*-*-*-*-* *-* ========================================== Note that this function is protected.
root.cern.ch /root/html/TNtuple.html   (287 words)

 Ntuple Analysis for Beginners
Some examples of how to use the profile and 2d-scatter plots to check the runNo.-dependence of the Rejection of a cut or the fitted mean of a peak, using kumac files "inv_his.kumac" and "prj.kumac", are given.
/kdecay/data10/e949/pass2/pnn1or2_02 : pass2 ntuples for 2002 pnn1or2 triggers
How to access to the ntuple (assuming the ntuples have already been chained)
www.phy.bnl.gov /e949/software/kofia/nt_ana   (684 words)

 ntuple   (Site not responding. Last check: 2007-11-03)
If you would rather work with an ntuple than directly with ORCA, please feel free to use my ntuple maker.
Also, if you are just getting started with ORCA, it might be a good example to look at.
ntuple maker which has been started and which will eventually provide this information.
home.fnal.gov /~sceno/jpg/ntuple.htm   (89 words)

 [No title]
/** Tutorial class to demonstrate the use of full blast column-wise ntuples.
This column-wise Ntuple contains * simple quantities and 1-dim arrays of variable length.
* Here the Ntuples are deleted and saved to file.
zito.web.cern.ch /zito/oldf/ntuplesource.txt   (500 words)

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