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	19693	September 24, 2018
Welcome to the ROOT forum! News	0	8362	June 24, 2016
RDataFrame with arrays of fixed length arrays? ROOT rdataframe	1	14	August 14, 2026
Replacing TTree I/O Traversal with Arithmetic: A Coordinate-Indexed Read Path for CMS Open Data ROOT tree , root	0	14	August 13, 2026
Sphere: Science Physics High Energy Research Environment Evolution Proposals, Apps & Ideas	0	23	August 12, 2026
C++20 std::format fails Newbie bug , root	6	52	August 11, 2026
Rare instance of JSROOT loading a TGraph incorrectly ROOT jsroot	2	45	August 10, 2026
ROOT 6.40.02 build failure with CMake 4.4.2 Newbie	2	27	August 7, 2026
GarfieldGPU Elmer Garfield++	1	38	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	45	August 6, 2026
CERN ROOT on Windows Newbie	65	312	August 5, 2026
Question about the scaling factor in ROOT’s weighted Poisson log-likelihood (WLS fit) Roofit and RooStats	4	94	August 4, 2026
Issue with new root version on lxplus ROOT root	2	72	August 3, 2026
TMVA cannot interpret some valid RDataFrame expressions as input variables TMVA rdataframe	1	42	July 31, 2026
Avalanche Microscopic in neBEM is too slow Garfield++	4	87	July 30, 2026
TBrowser old mode does not open TCanvas in macOS Tahoe ROOT root	3	36	July 29, 2026
Varying thickness TGeoXtru in ROOT Geometry Geometry root	5	71	July 28, 2026
Is it time for ROOT to c++ > std20? ROOT root	3	72	July 28, 2026
Crash in geometry after CheckOverlaps Geometry	3	69	July 27, 2026
Bug report: TH2::Draw with option "POL" wrongly transforms the coordinate for v6.36 and later ROOT bug	11	141	July 27, 2026
Segfault when drawing canvas stored in file ROOT bug	8	93	July 24, 2026
Creating own p.d.f. in RooFit Roofit and RooStats python , root	3	69	July 22, 2026
Using ROOT with EOS files with macaroons ROOT	6	102	July 22, 2026
Non stability of fitting in roofit Roofit and RooStats	6	93	July 22, 2026
TBufferMerger fails to write histograms to output file for Alma Linux ROOT hist	9	171	July 21, 2026
PyROOT changed handling of multidimensional branches between ROOT 6.32 and 6.34 ROOT	3	91	July 21, 2026
Using numba declare for python MVA node processing ROOT python , rdataframe	7	101	July 21, 2026
Numerical derivative of an array Newbie	3	390	July 16, 2026
Type name error after RNTuple Merging ROOT root	8	153	July 15, 2026
AvalancheMicroscopic RAM increased usage in newest commits Garfield++	5	99	July 14, 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…