[6.40] [RF] Fix RooBinIntegrator for ranges cutting through integrand bins#22930
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[6.40] [RF] Fix RooBinIntegrator for ranges cutting through integrand bins#22930root-project-bot wants to merge 1 commit into
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RooBinIntegrator builds its integration grid from the integrand's binBoundaries(xlo, xhi), which only returns the boundaries lying strictly inside the integration range. As a result, the integrator summed only the bins fully contained in the range and silently dropped the partial bins at the edges, because the integration limits were never added as the outermost bin boundaries. For example, integrating a 5-bin RooHistPdf (edges 0,2,4,6,8,10) over the sub-range [3,7] returned 2 instead of the correct 5.5. Fix this by prepending xmin and appending xmax as the outermost boundaries when they are not already present. The guard avoids zero-width bins when a range boundary coincides with a bin edge. Each resulting sub-bin then lies entirely within one original bin, so the midpoint rule stays exact for a piecewise-constant histogram. Add unit tests comparing the numeric RooBinIntegrator result against the analytic RooHistPdf integral for several range types, in both one and two dimensions. Closes root-project#22858. 🤖 Done with the help of AI. (cherry picked from commit ba4e908)
Test Results 22 files 22 suites 3d 7h 26m 11s ⏱️ For more details on these failures, see this check. Results for commit 730c12b. |
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Backport of #22922, requested by @guitargeek.