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…	4	19678	February 19, 2025
Welcome to the ROOT forum! News	1	8359	February 10, 2017
Question about the scaling factor in ROOT’s weighted Poisson log-likelihood (WLS fit) Roofit and RooStats	4	71	August 4, 2026
Issue with new root version on lxplus ROOT root	2	57	August 3, 2026
CERN ROOT on Windows Newbie	51	235	August 3, 2026
TMVA cannot interpret some valid RDataFrame expressions as input variables TMVA rdataframe	1	30	July 31, 2026
Avalanche Microscopic in neBEM is too slow Garfield++	4	72	July 30, 2026
Bug with RooExtendPdf produces inconsistency in rf204b_extendedLikelihood_rangedFit.C between before 6.26 and after 6.28 Roofit and RooStats	2	25	July 29, 2026
TBrowser old mode does not open TCanvas in macOS Tahoe ROOT root	3	25	July 29, 2026
Varying thickness TGeoXtru in ROOT Geometry Geometry root	5	66	July 28, 2026
Is it time for ROOT to c++ > std20? ROOT root	3	64	July 28, 2026
Crash in geometry after CheckOverlaps Geometry	3	64	July 27, 2026
Bug report: TH2::Draw with option "POL" wrongly transforms the coordinate for v6.36 and later ROOT bug	11	133	July 27, 2026
Segfault when drawing canvas stored in file ROOT bug	8	90	July 24, 2026
Creating own p.d.f. in RooFit Roofit and RooStats python , root	3	68	July 22, 2026
Using ROOT with EOS files with macaroons ROOT	6	100	July 22, 2026
Non stability of fitting in roofit Roofit and RooStats	6	92	July 22, 2026
TBufferMerger fails to write histograms to output file for Alma Linux ROOT hist	10	171	July 21, 2026
PyROOT changed handling of multidimensional branches between ROOT 6.32 and 6.34 ROOT	4	91	July 21, 2026
Using numba declare for python MVA node processing ROOT python , rdataframe	8	98	July 21, 2026
Numerical derivative of an array Newbie	3	388	July 16, 2026
Type name error after RNTuple Merging ROOT root	10	149	July 15, 2026
AvalancheMicroscopic RAM increased usage in newest commits Garfield++	6	94	July 28, 2026
Calculating median with RDataFrame? ROOT	4	74	July 27, 2026
Compiling with ROOT (issue specific to lxplus default root installation) Newbie	2	71	July 13, 2026
PyROOT: differences in object ownership betweeh TH1 and TGraphErrors ROOT	2	49	July 24, 2026
Question about the calculation of chisquare for 2D roofit Roofit and RooStats	2	33	July 23, 2026
Segfault with matplotlib and pyroot ROOT bug	11	99	July 23, 2026
PDG Database and Nuclei ROOT	4	380	July 9, 2026
Problems filtering a vector with a scalar Newbie python , root , rdataframe	3	63	July 8, 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…