1 Release Notes
for fastjet
2 -------------------------
4 ================================================================
5 Summary of changes from v3.0.1 -> v3.0.2: 17/01/12
6 ================================================================
8 This is a bug-fix release, including
10 * small fixes to the build system and fastjet-config
11 * further licence clarifications
12 * user can force early printing of banner with ClusterSequence::print_banner()
13 * included SISCone 2.0.5 (with small modifications to the build system)
15 ================================================================
16 Summary of changes from v3.0.0 -> v3.0.1: 25/11/11
17 ================================================================
19 Version 3.0.1 includes further reorganisation of the manual (version to
20 appear on arXiv), and a number of small additional changes, including :
22 *
PseudoJet now also has a pt() member function for transverse momentum
23 * minor speed improvements (very low N + strategy choice for N ~ 20-50)
24 * elimination of many compilation warnings found with -Wextra -Wshadow
25 * clarification of licenses for many of the plugins + new plugin banners
26 * fixed a memory leak in the ATLASConePlugin
28 ================================================================
29 Summary of changes from v2.4.4 -> v3.0.0: 09/10/11
30 ================================================================
32 Changes relative to the 2.4.x series include:
34 Addition of FastJet tools:
36 * Filtering, trimming, pruning and a few boosted
object taggers as
37 part of a new native "Transformers" framework for post-clustering
40 * New background estimation and subtraction interface, with
45 * Enhancement of the
PseudoJet class so that jets are now aware of their
46 internal structure (e.g. one can use jet.constituents()).
47 * It is possible to associate arbitrary user information with a
PseudoJet.
48 * Selectors, which allow easy communication of cuts across different functions
52 * Improved doxygen and examples
53 * aids for easier memory management
54 * elimination of the R<pi/2 restriction on native jet algorithms
56 * new plugins (GridJet and two D0RunICone plugins)
57 * enhanced fortran wrappers
59 Interface modifications (May break backwards compatibility):
61 * by default a
JetDefinition is initialised to undefined_jet_algorithm
62 instead of kt_algorithm with a radius of 1.
63 *
JetDefinition::DefaultRecombiner sets the user index of the result
64 of the recombination to -1 (the default for a
PseudoJet;
65 previously was being set to 0)
66 * ghosts are placed more sensibly in 3.0 than in the 2.X series;
67 call ghost_area_spec.set_fj2_placement(true) to reinstate old behaviour
68 * CS::exclusive_subjets used to silently return fewer subjets than
69 requested if there were too few particles in a jet; to be
70 consistent with exclusive_jets(...) it now throws an exception;
71 use exclusive_jets_up_to(...) and exclusive_subjets_up_to(...) to
73 * ATLASCone and TrackJet plugins use stable_sort instead of sort for
74 more stable behaviour across architectures and compiler versions;
75 this can change clustering results in events with degeneracies.
76 * some legacy headers have been removed (include/FjPseudoJet.hh and
77 include/FjClusterSequence.hh), and some classes are deprecated:
80 and CircularRange (use
Selector instead); see appendix G in manual
81 for further small removals.
83 Configure modifications
85 * the plugins are by default built in a single 'libfastjetplugin'
86 library. This is transparent if you use the fastjet-config
87 script. The previous behaviour (each plugin in its own library)
88 can be recovered by passing the --disable-monolithic option to
90 * an additional library, libfastjettools, contains tools like
91 boosted
object taggers, filters, etc. It is included by default
92 with "fastjet-config --libs"
95 New features relative to 3.0beta1:
102 Bug fixes and other changes relative to 3.0beta1:
104 * JetMedianBackgroundEstimator::set_particles(...) no longer resets other parameters
105 * fixed issue with persistency of internal recombiner in
Filter
107 jet def) and also CS::set_jet_algorithm(...), CS::set_jet_def(...)
110 ================================================================
111 Summary of changes from v3.0beta1 -> v3.0.0: 09 October 2011
112 ================================================================
114 - addition of
Pruner class
119 Bug fixes and other changes
120 - JetMedianBackgroundEstimator::set_particles(...) no longer resets other parameters
121 - fixed issue with persistency of internal recombiner in
Filter
122 - removed deprecated
ClusterSequence constructor with R (rather than jet def)
123 and also CS::set_jet_algorithm(...), CS::set_jet_def(...)
125 ================================================================
126 Summary of changes from v3.0alpha3 -> v3.0beta1: 10 August 2011
127 ================================================================
129 - Reorganised background estimation to have a JetMedianBackgroundEstimator
131 [v3.0alpha3 programs should replace BackgroundEstimator
132 -> JetMedianBackgroundEstimator, and use a new order of constructor arguments]
136 delete_recombiner_when_unused()
137 - improved
Filter (for area and recombiner support, also works with a subtractor)
138 - added a --config flag to fastjet-config
140 Bug fixes and other changes
141 - some speed gains in the default recombiner
142 - TrackJet and ATLASCone now use stable_sort (can change results;
143 makes results stable across machine architectures & compilers, cf BUGS)
144 - fixed bugs in Voronoi areas (as in v.2.4.4)
145 - fixed bugs in handling of empty areas in background estimator (as in 2.4.4)
146 - renamed SelectorMXXX -> SelectorMassXXX
148 - exclusive_[sub]jets(njets) now consistenty throws an error if it
149 can't deliver njets; exclusive_[sub]jets_upto(njets) gives up to njets
154 - reorganisation of substantial parts of the manual
157 ================================================================
158 Summary of changes from v3.0alpha2 -> v3.0alpha3: 03 June 2011
159 ================================================================
163 *
Subtractor: subtract the jet using a BackgroundEstimator
166 * NSubjettinessTagger: 2-pronged tagger based on rest-frame 2-subjettiness
167 *
CASubJetTagger: 2-pronged tagger based on maximal distance in jet history
168 *
Filter updated from alpha2 (bug fixes & new constructors)
169 NB: examples 11 (boosted Higgs) and 12 (
Filter) illustrate usage.
171 - CS::delete_self_when_unused() allows it to handle its own memory management
176 the jets from an old sequence as they are transferred to the new one
177 - fortran interface now has basic area functionality
179 Changes to features introduced in alpha2 and alpha1:
180 - Numerous changes to BackgroundEstimator
181 * it allows manual encoding of rapidity dependence;
182 * it can calculate density of quantities other than pt;
183 * it has additional constructors, plus methods to reset its
ClusterSequence, etc.
184 * its sigma() now properly handles finite numbers of jets (+ other bug fixes).
185 - jet.pieces() for a jet from a clustering now returns the two parents
186 - various changes to behaviour of a jet's structural calls; see new table in doc
187 - PseudoJet::extra_properties<...>() -> PseudoJet::structure_of<...>() (cf example 12)
188 - join(...) can now include a recombiner argument; it also now supports areas
189 -
Selector::count(jets) to know how many pass a cut (also new:
Selector::sift)
192 - by default a PseudoJet is constructed with zero momentum
194 - efficiency improvements in PtYPhiM and ghost generation
196 retained, but deprecated.
197 - added an example (09) to illustrate how to add user-info to a PseudoJet
198 - doxygen output now configured with an internal search engine
201 - the default recombiner used to set the user_index to the non-default
202 value of 0. Now it sets it to the default (-1).
203 - fixed crashes of VoronoiAreas for particles on a grid (also in 2.4.3)
206 ================================================================
207 Summary of changes from v3.0alpha1 -> v3.0alpha2: 10 March 2011
208 ================================================================
211 - two jets, a and b can now be joined: PseudoJet c = join(a,b),
212 intended to facilitate packaging the result of substructure tools;
213 individual pieces can be recovered with c.pieces();
215 - New fastjet/tools/
Filter.hh provides a unified interface to filtering and trimming
216 - New very preliminary fastjet/tools/BackgroundEstimator.hh to provide
217 a more flexible interface to estimation of backgrounds (removal of
219 - a few extra Selectors
221 Changes to features introduced in alpha1:
223 -
Selector::relocate(...) and is_relocatable() renamed to
224 Selector::set_reference(...) and takes_reference()
225 - PseudoJet::ExtraInfo has been renamed PseudoJet::UserInfoBase and
226 corresponding access functions are now called set_user_info(...), etc.
228 Other changes and fixes
229 - some legacy headers removed
230 - bug fixes in NlnNCam strategies for R>pi
232 ===========================================================
233 Summary of changes from v2.4.X -> v3.0alpha1: 27 January 2011
234 ===========================================================
236 This is an alpha release, previewing some of the new features that are
237 expected to be available in FastJet version 3. Interfaces of new
238 features may yet evolve.
241 - Several extensions to PseudoJet:
242 * it now knows what ClusterSequence it belongs to
243 * info about internals of jets can be accessed e.g. as jet.constituents()
244 * it now has a virtual destructor + other support for classes derived from PseudoJet
245 * new facilities for associating user info with a jet (see PseudoJet::ExtraInfo)
246 * some of these features make use of a new
SharedPtr class
247 (intended mainly for advanced users)
248 similar to C++0x std::shared_ptr
249 * calculation of phi and rapidity (cached) only on request
250 - R can now be taken larger than pi/2 for natively coded jet algorithms
251 - Addition of "
Selector" tools through
#include "fastjet/tools/Selector.hh"
252 - New plugin
for D0RunICone (code contributed by Lars Sonnenschein)
253 - Improvements to fortran wrapper (access to SISCone, jet constituents, etc.)
256 - fixed issue with inconsistent returned sign in PseudoJet::delta_phi_to(...)
258 Other notable changes:
259 - Revamping of examples
260 - by default all plugins are now packaged into libfastjetplugins.
261 Note that "external" libraries like libsiscone are still separate.
262 - Significant improvements to doxygen documentation
264 ===========================================================
265 Summary of changes from v2.4.1 -> v2.4.2: 26 February 2010
266 ===========================================================
267 - exclusive_ymerge_max(...) was not working; now fixed
270 optimisation flags now changed just for D0 code so that 32 bit gives same
272 - changes to configure.ac to better handle fortran compiler checks
273 - removed some orphan/redundant code that was generating compilation warnings
274 - added an "--enable-monolithic" option to ./configure which causes
275 all plugins to be placed in a single library (except SISCone)
276 - added a "--list-plugins" option to fastjet-config
278 =======================================================
279 Summary of changes from v2.4.0 -> v2.4.1: 29 May 2009
280 =======================================================
282 Fixes to the build system
283 -------------------------
284 - Included SISCone 2.0.1 (shared libs now enabled by default in
285 SISCone too, and other small fixes)
286 - Fixed platform-dependent failures during make check
287 - Fixed gcc 4.4 compatibility issues (missing headers)
288 - Fixed a problem on Mac OS X with the arguments provided by
289 "fastjet-config --libs" (--rpath versus -rpath).
290 - fastjet-config has new optional arguments (--rpath=no, --runpath)
291 related to finding shared libraries at runtime on linux.
292 Run fastjet-config without any arguments for more info.
293 To instead use static libraries, either configure with the
294 --disable-shared option, or use fastjet-config with the --shared=no option.
295 - fastjet-config can now take --cxxflags and --libs in a single invocation
296 - With --cxxflags, fastjet-config now returns the minimal required set of arguments
297 - Various other small mods (better fortran support, standardisation, ...)
298 [thanks to Andy Buckley and David Grellscheid for suggestions]
302 - Added a fortran wrapper for pp sequential recombination algorithms
303 - Fixed issue in median rho estimation when some jets have zero area
304 - Expanded descriptions that are returned by ATLAS/TrackJet/CMS plugins
305 - Warnings are no longer given when using exclusive jets with
306 Cam/Aachen and certain e+e- algorithms (the warnings were misleading)
307 - Small fixes to the manual
309 =======================================================
310 Summary of changes from v2.3.X -> v2.4.0: 17 April 2009
311 =======================================================
317 - added implementation of generalised kt algorithm (genkt_algorithm) for pp
318 - added D0RunIICone plugin [--enable-d0runiicone at configure time]
319 - added ATLASCone Plugin [--enable-atlascone at configure time]
321 - added TrackJet Plugin (used by CDF in UE studies)
322 [--enable-trackjet at configure time]
324 Introduction of e+e- algorithms
325 -------------------------------
327 - added an implementation of the e+e- kt algorithm (ee_kt_algorithm),
329 - added JADEPlugin for the JADE algorithm (see the ChangeLog or header
332 e+e- and other spherical environments.
333 - native implementation of generalised kt algorithm for e+e- (ee_genkt_algorithm)
334 [also provides access to e+e- form of anti-kt alg, conical jets on a sphere]
335 - added
JadePlugin for the e+e- Jade algorithm
340 - added NestedDefs plugin for daisy-chaining multiple jet definitions
341 [still under testing; API may change in the future]
345 - added subjet functions for viewing jet at particular dcut, etc.
346 - added access to exclusive jets based on ycut as well as dcut (for e+e-)
349 use in background estimation
350 - added class
NNH to help users implement algorithms with
351 user-chosen distance measure (see
JadePlugin for an example)
353 Interface modifications
354 -----------------------
355 - removed default value of 0.5 for overlap_threshold in
356 CDFMidPointPlugin, CDFJetCluPlugin and
SISConePlugin constructors
358 *** may break backwards compatibility ***
360 - a
JetDefinition(jet_alg) constructor, without an R value, is no
361 longer legal, except when jet_alg is ee_kt_algorithm (it has no R).
363 *** may break backwards compatibility ***
365 - in SISCone, new way of accessing the information about pass at which
366 a jet was found (old method retained for 2.4, but now deprecated)
369 Configure modifications
370 -----------------------
371 - added --enable-allplugins and --enable-allcxxplugins options, to
372 avoid having to specify a
long list of individual plugins
373 - shared libraries are now enabled by default
381 -----------------------
382 - added support for CGAL 3.4 (for non-standard locations, specify
383 --with-cgaldir at configure time)
384 - removed restriction that fastjet throws exception on empty events
385 - added an example that illustrates the use of subjet techniques for
386 a boosted Higgs->b+bbar search
390 - add CMSIterativeCone Plugin
394 =======================================================================
395 Summary of changes from v2.3.3 -> v2.3.4 (bug fix release): 15 Aug 2008
396 ==========================================================
398 - fixed infinite-loop bug in JetClu plugin on certain rare events
400 - fixed compatibility issues of certain example programs with g++-4.3
402 - incorporated SISCone 1.3.3 with similar g++-4.3 fixes
404 =======================================================================
405 Summary of changes from v2.3.2 -> v2.3.3 (bug fix release): 28 Apr 2008
406 ==========================================================
408 - fixed missing installation of .../config_auto.h
410 - fixed missing typename in .../SearchTree.hh
412 =======================================================================
413 Summary of changes from v2.3.1 -> v2.3.2 (bug fix release): 03 Apr 2008
414 ==========================================================
416 - fixes to propagation of CXXFLAGS through the build chain
418 - small change in Voronoi area code to fix crashes on regular
419 (calorimeter) layouts of momenta
421 - small change in active areas code to fix crashes on algorithms that
422 do not cluster all particles
424 - eliminated "using namespace std" that had accidentally been left in
425 certain area header files
427 - incorporation of SISCone 1.3.2 with fixes for inappropriate public
428 symbols and to build framework
431 ======================================================================
432 Summary of changes from v2.3.0 -> v2.3.1 (bug fix release)
433 ==========================================================
435 - Fixed compilation issues under windows VC7.1 (reported by
436 I. Belyaev); also included SISCone 1.3.1 with similar fixes.
438 - Fixed speed issue under optimized compilation of CDF MidPoint plugin
439 for 32 bit architectures that had arisen subsequent to the switch to
440 autotools with its common optimization settings.
442 - Fixed "make check" failure with the --disable-siscone option.
444 - Fixed crash in exclusive_dmerge(njets) for njets=0 (reported by P. Lenzi)
447 ======================================================================
448 Summary of changes from v2.1.0 (previous stable release) to v2.3.0
449 ===================================
451 - added the anti-kt algorithm (LPTHE-07-03), which is a sequential
452 recombination algorithm that gives conical jets.
454 - Added Passive and Voronoi areas, and new common class for accessing
457 - switched to autotools for compilation and installation:
458 ./configure --prefix=...
460 make check [optional]
463 NB: users should no longer include fastjet-2.x.y/Makefile
464 when building their own programs, and instead should use
465 g++ -c file.cc `fastjet-config --cxxflags`
466 g++ file.o `fastjet-config --libs --plugins`
468 - plugin include files are now to be accessed with fastjet/ in
470 #include "fastjet/SISConePlugin.hh"
471 A simple #include
"SISConePlugin.hh" is now obsolete but will
472 continue to work through 2.x
477 - New facilities for navigating the cluster sequence (has_parents,
478 has_child and has_partner members of ClusterSequence)
480 - other bug fixes and small enhancements (including SISCone-1.3.0,
481 improvements to plugin facilities).
483 See individual beta-releases below for more information, as well as
487 ======================================================================
488 Changes from v2.2beta0 to v2.3-beta0
489 ===================================
491 - switched to autotools
for compilation and installation;
493 - old build procedure still available
for now, with files called
494 makefile.static (make -f makefile.static);
496 test-script.sh has been renamed test-
static.sh and builds and
497 tests
using the old procedure.
499 - plugins include files are now to be accessed with fastjet/ in
501 #include
"fastjet/SISConePlugin.hh"
503 For backwards compatibility, the old access method will
continue
504 to work throughout v2.x, i.e.
505 #include
"SISConePlugin.hh"
507 - added PseudoJet::reset(...) functions to reset the contents of a
510 - added fastjet_version_string()
512 - added a function PtYPhiM(...) that returns a PseudoJet with the
513 given py, rapidity , phi and mass. Defined in PseudoJet.hh
515 - added a directory fortran_wrapper/ to illustrate how to access
518 - some small bug fixes in the CDF midpoint code
521 ======================================================================
522 Changes from v2.1.0 to v2.2beta0
523 ===============================
525 - added the anti-kt algorithm (LPTHE-07-03)
527 - Provided a new common class for accessing all different types of
530 - added functionality for Passive areas and Voronoi areas.
531 Areas are now defined much in the same way as jets, via an
534 sweepline code for calculating the Voronoi diagram and so does not
535 require CGAL to be installed (it still is needed for NlnN kt
539 of the rapidity-azimuth ranges over which to study jet areas
540 and possibly perform noise subtraction
542 - added facilities for navigating the cluster sequence (has_parents,
543 has_child and has_partner members of ClusterSequence)
545 - changed plugin base class, so that it now includes R() virtual
546 member, and modified the various plugins to account for this.
548 - modified the plugin interface to provide facilities to help with
551 - included SISCone-1.2.0 rather than 1.1.1.
553 - adapted SISCone plugin to the 1.2.0 release of SISCone --
main
554 changes are facilities and improvements related areas: some speed
555 improvements on the split-merge (relevant for active areas) and a
556 fairly efficient way of running passive areas.
558 - added ClusterSequence::print_jets_for_root(...) and a corresponding root
559 script (example/root/jet-plots.C), so as to provide a crude
563 ======================================================================
564 Summary of
main changes from v2.0.0 to v2.1.0
565 =============================================
567 - added plugin structure for external jet finders.
569 - included plugins for SISCone, CDFMidPoint, CDFJetClu, PxCone (with
570 extensions for MidPoint and bug fixes for PxCone relative to public
573 - introduced option of control over recombination scheme, with a
576 - added description() member function to
JetDefinition class, so
577 that you can get a (
string) summary of what you're running!
579 - changed the default number of repeats in
ActiveAreaSpec to 1 (which
580 is sufficient for most purposes).
582 For further details, see the changes listed in detail below.
584 ======================================================================
585 Changes from v2.1.0b4 to v2.1.0
586 ===============================
588 - corrected bug in test-script.sh
590 - removed PxCone from default tests and from
591 plugins/usage_examples/many_algs_example.cc (to avoid fortran
594 ======================================================================
595 Changes from v2.1.0b3 to v2.1.0b4
596 =================================
598 FastJet modifications
599 ---------------------
601 - default number of repeats for the active area specification has been
602 changed from 5 to 1 (the latter goes fast, but note that it provides
603 a zero error estimate for the area).
608 - adapted plugin to accomodate new scale for use in the SISCone
609 split-merge (pttilde), with a corresponding change of interface.
611 Changed default number of passes for SISCone to 0.
613 - Added the pttilde scale choice to the CDF plugin.
617 ======================================================================
618 Changes from v2.1.0b2 to v2.1.0b3
619 =================================
624 - methods for estimating the underlying now have the option of using
625 area_4vector rather than the plain area
630 - area_4vector is now calculated with the same recombination scheme as
633 - massless recombination schemes now work correctly on particles with
636 - PseudoJet::phi_std() returned wrong result for phi < pi -- thanks to
637 Oscar Stal for pointing this out.
642 - the plugin mechanism now allows a plugin to add "extra" information
643 to the ClusterSequence, essentially by providing an auto_ptr to a
644 class derived from (the new) ClusterSequence::Extras; an example of
645 this has been implemented with siscone (
SISConeExtras) which allows
646 a user to access the initial (stable) protocones.
648 - included new siscone version (1.1) which uses transverse mass (mt) rather
649 than pt in the split-merge procedure, to address an IR problem in
650 events where the hadronic part conserves momentum -- this can have
651 an effect on some physical distributions; the siscone update also
652 addresses issues with collinear safety and co-circular points.
654 - included bug fixes to pxcone regarding 2pi periodicity when
657 - modified the version of the CDF midpoint cone code so as to allow it
658 to use mt and Et as the parameters in the split--merge step.
660 ======================================================================
661 Changes from v2.1.0b1 to v2.1.0b2
662 =================================
667 - included new siscone version which solves the memory-leak problem
672 - added sample output from the test-script as test-script-output-orig.txt
674 ======================================================================
675 Changes from v2.1.0b0 to v2.1.0b1
676 =========================
681 - added the SISCone plugin and the beta version of the siscone code
682 (authored by Soyez & Salam)
687 - removed extraneous semicolons after functions that were causing
688 problems on some compilers.
693 - Added COPYING file with GPL license
695 ======================================================================
696 Changes from v2.0 to v2.1 (beta0)
697 =========================
702 - introduced option of control over recombination scheme, with a
704 to the
JetDefinition constructor) and also the possibility of an
705 externally defined recombination scheme.
707 - introduced a "plugin" facility for alternative jet finders, via an
712 Plugins are to be provided as classes derived from this,
713 implementing the relevant virtual functions (see manual and examples
716 - introduced "description" member function for the
JetDefinition
717 class, which returns a (std::
string) textual description of the
720 - provided plugins for CDF JetClu, CDF Midpoint, PxCone code; the
721 plugins, the code they interface to and example programs are to be
722 found in the new plugins/ directory.
724 - added ClusterSequence::unclustered_particles() a vector containing
725 the unclustered particles (relevant for some plugin algorithms).
730 - introduced PseudoJet::squared_distance (does same as "plain_distance")
737 - in the documentation, replaced eta -> y, to make it clear that it's
738 rapidity and not pseudorapidity that is being used throughout. Some
739 internal code continues to use variables called "eta" -- but these
740 are actually proper rapidity.
743 ======================================================================
744 Changes from v1.0 to v2.0
745 =========================
750 - the longitudinally invariant inclusive Cambridge/Aachen jet finder
753 Note that the exclusive jets extraction for the Cambridge jet-finder
754 does not provide the definition as given in the original Cambridge
755 paper. See the documentation for further details
757 - classes have been introduced for running jet clustering and
758 simultaneously collecting information about the area of each jet.
759 The base class specifying the functionality is
763 itself derived from ClusterSequence.
765 Two derived classes that provide the actual areas functionality are:
770 To construct them, one also needs to specify how one wishes the area
771 to be calculated, via a class
778 - new clustering strategies have been added:
781 N2MinHeapTiled : like N2Tiled, except that the non-geometric
782 part has been replaced with a N ln N algorithm
783 (overall the strategy still scales as N^2, but with a
786 NlnNCam, NlnNCam2pi2R, NlnNCam4pi:
788 NlnN strategies specific to the Cambridge/Aachen
789 jet-finder -- the fastest of them is NlnNCam.
790 Depending on the size of the event and of the CPU
791 cache it may be up to 2.5 times faster than the
792 CGAL-based NlnN strategy. Experiment on your own
793 hardware and events to establish whether the
794 speed gain is significant.
796 These strategies are based on the work on dynamic
797 Closest Pair problems by Timothy Chan.
799 Best : (was present before) now attempts to select best
800 among N2Plain, N2Tiled, N2MinHeapTiled, NlnN.
802 As the best option for a given N may depend on R
803 and the event structure, you are advised to
804 experiment with individual strategies if the
805 last few tens of percent in speed are critical.
809 Updates to user interface
810 -------------------------
812 While the v1 interface to fastjet has been maintained for backwards
813 compatibility, for new developments in v2 and related forthcoming
814 work, a new interface is provided as follows:
816 - User accessible classes and enums have had the "Fj" prefix removed
817 and are instead now in namespace fastjet; the corresponding include
818 files are in the include/fastjet directory. So, for example instead
821 #include "FjClusterSequence.hh"
823 FjClusterSequence clust_seq(...)
825 one now uses the following
827 #include "fastjet/ClusterSequence.hh"
831 If typing "fastjet::" the whole time seems too
long-winded, you can
832 abbreviate "fastjet" as "fj" with
834 namespace fj = fastjet;
836 or eliminate the need for it altogether with
838 using namespace fastjet;
840 - a new class, fastjet::
JetDefinition, has been introduced for holding
841 the details of the jet finder (which one, value of R, etc...) that
842 is to be used in a given clustering.
844 #include "fastjet/JetDefinition.hh"
845 #include "fastjet/ClusterSequence.hh"
857 - some errors that previously were assertions now
throw an
858 fastjet::Error -- exception. A fully uniform handling of exceptions
859 is currently some way away however and users
for whom
this is an
860 important issue should contact the authors.