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[RN] Add release notes for new histogram package #23785

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9 changes: 9 additions & 0 deletions README/ReleaseNotes/v642/index.md
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Expand Up @@ -186,6 +186,15 @@ The behavior for one-dimensional histograms is unchanged. Code that relied on
the previous 2D/3D output (for example to build per-axis selection efficiency
maps) will now obtain different, mathematically consistent values.

### New histogram package

The new histogram package continues development in the `ROOT::Experimental` namespace.
This release introduces `RHistEngine::SnapshotAtomic` to obtain a consistent copy during concurrent filling.
There is now a class [`ROOT::Experimental::RProfile`](https://root.cern/doc/v642/classROOT_1_1Experimental_1_1RProfile.html)
for (multidimensional) profile histograms.
`RHist` and `RHistEngine` with two or three dimensions can be converted to `TH2` or `TH3`.
More conversion functions will continue to be added in the future (`THn`, `TProfile`).

## Math

### Skipping identically-vanishing second derivatives in numerical Hessian evaluation
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