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Update 04-awkward.md #62

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Dec 6, 2023
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Update 04-awkward.md #62

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Update 04-awkward.md
GuillermoFidalgo Dec 4, 2023
e6ec7ba
fix solution formatting into python code
GuillermoFidalgo Dec 4, 2023
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15 changes: 15 additions & 0 deletions _episodes/04-awkward.md
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Expand Up @@ -139,6 +139,21 @@ cleaned = muon_pt[particle_cut]

intermediary and you can't use the variable `event_cut`, as-is.


Hint: the final result should be a jagged array, just like muon_pt, but with fewer lists and fewer items in those lists.

> ## Solution (no peeking!)
> ```python
> cleaned = muon_pt[particle_cut]
> final_result = cleaned[event_cut]
> final_result.tolist()
> [[32.911224365234375, 23.72175407409668],
> [57.6067008972168, 53.04507827758789],
> [23.906352996826172]]
> ```
{: .solution}


# Combinatorics in Awkward Array

Variable-length lists present more problems than just slicing and computing formulas array-at-a-time. Often, we want to combine particles in all possible pairs (within each event) to look for decay chains.
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