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	19707	September 24, 2018
Welcome to the ROOT forum! News	0	8366	June 24, 2016
Question about the scaling factor in ROOT’s weighted Poisson log-likelihood (WLS fit) Roofit and RooStats	6	123	August 27, 2026
RNTuple: MakeField causes termination of program ROOT rdataframe	0	6	August 26, 2026
RNTuple MakeField with custom class leads to termination of program ROOT rdataframe	0	4	August 26, 2026
Using RooFit to fit a model with a gaussian, exponential and templatedfunction Roofit and RooStats roofit	1	27	August 24, 2026
Replacing TTree I/O Traversal with Arithmetic: A Coordinate-Indexed Read Path for CMS Open Data ROOT tree , root	8	65	August 21, 2026
Fill Style issue ROOT bug	2	39	August 19, 2026
Export raytraced geometries in batch mode Geometry	4	48	August 18, 2026
Using ROOT with EOS files with macaroons ROOT	7	125	August 17, 2026
Rare instance of JSROOT loading a TGraph incorrectly ROOT jsroot	4	86	August 17, 2026
RDataFrame with arrays of fixed length arrays? ROOT rdataframe	1	42	August 14, 2026
Sphere: Science Physics High Energy Research Environment Evolution Proposals, Apps & Ideas	0	45	August 12, 2026
C++20 std::format fails Newbie bug , root	6	99	August 11, 2026
ROOT 6.40.02 build failure with CMake 4.4.2 Newbie	2	50	August 7, 2026
GarfieldGPU Elmer Garfield++	1	52	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	56	August 6, 2026
CERN ROOT on Windows Newbie	65	369	August 5, 2026
Issue with new root version on lxplus ROOT root	2	81	August 3, 2026
TMVA cannot interpret some valid RDataFrame expressions as input variables TMVA rdataframe	1	46	July 31, 2026
Avalanche Microscopic in neBEM is too slow Garfield++	4	101	July 30, 2026
TBrowser old mode does not open TCanvas in macOS Tahoe ROOT root	3	44	July 29, 2026
Varying thickness TGeoXtru in ROOT Geometry Geometry root	5	78	July 28, 2026
Is it time for ROOT to c++ > std20? ROOT root	3	81	July 28, 2026
Crash in geometry after CheckOverlaps Geometry	3	70	July 27, 2026
Bug report: TH2::Draw with option "POL" wrongly transforms the coordinate for v6.36 and later ROOT bug	11	146	July 27, 2026
Segfault when drawing canvas stored in file ROOT bug	8	95	July 24, 2026
Creating own p.d.f. in RooFit Roofit and RooStats python , root	3	73	July 22, 2026
Non stability of fitting in roofit Roofit and RooStats	6	96	July 22, 2026
TBufferMerger fails to write histograms to output file for Alma Linux ROOT hist	9	172	July 21, 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…