[RF] disable analytical integrals also with linear interpolation

ferdymercury · web-flow · commit b1f5cf7ee11b · 2025-10-15T18:09:18.000+02:00
Fixes #20116
diff --git a/roofit/roofitcore/src/RooHistPdf.cxx b/roofit/roofitcore/src/RooHistPdf.cxx
@@ -319,7 +319,7 @@ Int_t RooHistPdf::getAnalyticalIntegral(RooArgSet& allVars,
   // Disable partial analytical integrals if interpolation is used, and we
   // integrate over sub-ranges, but leave them enabled when we integrate over
   // the full range of one or several variables
-  if (intOrder > 1 && !(code & 1)) {
+  if (intOrder > 0 && !(code & 1)) {
     analVars.removeAll();
     return 0;
   }

Original file line number	Diff line number	Diff line change
`@@ -319,7 +319,7 @@ Int_t RooHistPdf::getAnalyticalIntegral(RooArgSet& allVars,`
`319`	`319`	`// Disable partial analytical integrals if interpolation is used, and we`
`320`	`320`	`// integrate over sub-ranges, but leave them enabled when we integrate over`
`321`	`321`	`// the full range of one or several variables`
`322`		`- if (intOrder > 1 && !(code & 1)) {`
	`322`	`+ if (intOrder > 0 && !(code & 1)) {`
`323`	`323`	`analVars.removeAll();`
`324`	`324`	`return 0;`
`325`	`325`	`}`