[RF] Fix RooHistPdf sub-range integrals with interpolation#20119
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ferdymercury wants to merge 1 commit into
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[RF] Fix RooHistPdf sub-range integrals with interpolation#20119ferdymercury wants to merge 1 commit into
ferdymercury wants to merge 1 commit into
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Test Results2 604 tests 2 604 ✅ 1h 14m 0s ⏱️ Results for commit 0929cf3. ♻️ This comment has been updated with latest results. |
guitargeek
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Jun 24, 2026
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Thanks for implementing the right fix! I added a test, and now it's good to go.
guitargeek
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The analytical integral of a RooHistPdf sums the bin contents of the underlying RooDataHist, which integrates the piecewise-constant histogram. For interpolated histograms (intOrder > 0) this only matches the actual curve over the full range; over a sub-range it does not, so the integral was wrong (it returned the intOrder == 0 step-function area regardless of the interpolation order). Fall back to numerical integration for sub-range integrals of interpolated histograms, but only when integrating over the histogram's own fundamental observable. A derived (non-fundamental) observable has already passed the constant-Jacobian check in okayForAnalytical and is a genuine transform of the histogram variable, e.g. the RooLinearVar that RooMomentMorphFuncND uses to renormalize its components; those keep the analytical path they rely on. Full-range integrals and non-interpolated histograms are unaffected. Closes root-project#20116. 🤖 Done with the help of AI.
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The analytical integral of a RooHistPdf sums the underlying RooDataHist
bin contents, which only matches the interpolated curve over the full
range. For interpolated histograms (intOrder > 0), RooHistPdf took this
shortcut also over sub-ranges, returning the step-function (intOrder == 0)
area regardless of the interpolation order. Fall back to numerical
integration in that case; full-range integrals and non-interpolated
histograms are unaffected and still use the analytical path.
Closes #20116.