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Creating a new Awkward array from indices

The problem I am facing is to create a new array from a set of indices. Namely, I have a set of particles and jets, for each jet there is a list of indices of which particles belong to the given jet.

    import awkward as ak
    import vector

    particles = ak.Array({
        "mass": ak.Array([1, 2, 3, 4, 5]),
        "px": ak.Array([1, 2, 3, 4, 5]),
        "py": ak.Array([1, 2, 3, 4, 5]),
        "pz": ak.Array([1, 2, 3, 4, 5]),
    })

    particles_p4 = vector.awk(ak.zip({
        "mass": particles["mass"],
        "x": particles["px"],
        "y": particles["py"],
        "z": particles["pz"]
    }))

    jet = ak.Array({
        "constituents": ak.Array([[1, 2, 4, 5], [3]]),
        "energy": ak.Array([1.2, 3.4])
    })

What I would like to get is for each jet the particle_p4 values in a new array like so:

<Array [[{x: 1, y: 1, z: 1, ... z: 4, tau: 4}]] type='2 * var * {"x": int64, "y"...'>

where the first element of that would be:

<Array [{x: 1, y: 1, z: 1, ... z: 5, tau: 5}] type='4 * {"x": int64, "y": int64,...'>

Doing this with a for loop is trivial, however I have the notion that this can be done in a more efficient way with the tools available in Awkward array.

Bonus: What about even more nested arrays, for example where each event has multiple jets?



source https://stackoverflow.com/questions/75226252/creating-a-new-awkward-array-from-indices

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