ROOT Forum

Topic	Replies	Views	Activity
Newbie forum for when you're not sure News If you’re new to ROOT, C++, data analysis etc, and you hesitate to ask your question, then please ask it in the Newbie section, where nice people help and we have special rules to be more welcoming. Don’t hesitate, jus…	0	19731	September 24, 2018
Welcome to the ROOT forum! News	0	8387	June 24, 2016
Question about the scaling factor in ROOT’s weighted Poisson log-likelihood (WLS fit) Roofit and RooStats	9	174	September 14, 2026
Custom RDataSource without (or with limited) multithreading ROOT	3	34	September 11, 2026
Plotting LEGO with SURF Newbie	1	29	September 8, 2026
TProfile::Chi2Test is scale invariant ROOT	1	41	September 7, 2026
Sphere: Science Physics High Energy Research Environment Evolution Proposals, Apps & Ideas	1	89	September 6, 2026
Pointers displayed during usage of TBrowser Newbie	1	32	September 4, 2026
CMake Configure Error on Windows ROOT cmake	1	29	September 2, 2026
TF1 drawing issue in ROOT versions > 6.28.10 ROOT	4	50	August 29, 2026
Unexpected behavior of nested for loops when loading a macro with .L Newbie	13	150	August 28, 2026
ROOT 6.40.04 is out! News	0	43	August 28, 2026
RNTuple: MakeField causes termination of program ROOT rdataframe	7	56	August 27, 2026
Using RooFit to fit a model with a gaussian, exponential and templatedfunction Roofit and RooStats roofit	1	51	August 24, 2026
Replacing TTree I/O Traversal with Arithmetic: A Coordinate-Indexed Read Path for CMS Open Data ROOT tree , root	8	97	August 21, 2026
Fill Style issue ROOT bug	2	49	August 19, 2026
Export raytraced geometries in batch mode Geometry	4	59	August 18, 2026
Using ROOT with EOS files with macaroons ROOT	7	136	August 17, 2026
Rare instance of JSROOT loading a TGraph incorrectly ROOT jsroot	4	98	August 17, 2026
RDataFrame with arrays of fixed length arrays? ROOT rdataframe	1	49	August 14, 2026
C++20 std::format fails Newbie bug , root	6	115	August 11, 2026
ROOT 6.40.02 build failure with CMake 4.4.2 Newbie	2	68	August 7, 2026
GarfieldGPU Elmer Garfield++	1	66	August 6, 2026
Bug with RooExtendPdf produces inconsistency in rf204b_extendedLikelihood_rangedFit.C between before 6.26 and after 6.28 Roofit and RooStats	3	66	August 6, 2026
CERN ROOT on Windows Newbie	65	400	August 5, 2026
Issue with new root version on lxplus ROOT root	2	97	August 3, 2026
TMVA cannot interpret some valid RDataFrame expressions as input variables TMVA rdataframe	1	58	July 31, 2026
Avalanche Microscopic in neBEM is too slow Garfield++	4	113	July 30, 2026
TBrowser old mode does not open TCanvas in macOS Tahoe ROOT root	3	50	July 29, 2026
Varying thickness TGeoXtru in ROOT Geometry Geometry root	5	89	July 28, 2026

Newbie forum for when you're not sure

If you’re new to ROOT, C++, data analysis etc, and you hesitate to ask your question, then please ask it in the Newbie section, where nice people help and we have special rules to be more welcoming. Don’t hesitate, jus…