1. use 'RoMinimizer' instead of RooMinuit for fresh version of ROOT

OstapHEP · Sep 7, 2023 · 2fc658c · 2fc658c
1 parent 94f5eac
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diff --git a/ReleaseNotes/release_notes.md b/ReleaseNotes/release_notes.md
@@ -5,7 +5,8 @@
   1, add the methods `min` & `max` to histogram objects 
   1. make use for `ROOT::TDirectory::TContext` for `ROOTCWD`
   1. imporve functions/pdf for Benini distribution allowing terms upto power 10
-
+  1. use 'RoMinimizer' instead of `RooMinuit` for fresh version of ROOT 
+
 ## Backward incompatible: 
 
 ## Bug fixes:

diff --git a/ostap/fitting/pdfbasic.py b/ostap/fitting/pdfbasic.py
@@ -1094,7 +1094,10 @@ def chi2fitTo ( self            ,
             args_ = tuple ( lst2 + lst1  )
             #
             chi2 = ROOT.RooChi2Var ( rootID ( "chi2_" ) , "chi2(%s)" % self.name  , self.pdf , hdataset , *args_ )
-            m    = ROOT.RooMinuit  ( chi2 ) 
+            ## 
+            if root_info < ( 6 , 28 ) :  m = ROOT.RooMinuit    ( chi2 )
+            else                      :  m = ROOT.RooMinimizer ( chi2 )
+            ##
             m.migrad   () 
             m.hesse    ()
             result = m.save ()