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ak.to_var and ak.from_var: convert regular dimensions to and from variable dimensions with a high-level function #551

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jpivarski opened this issue Nov 18, 2020 · 0 comments · Fixed by #553
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ak.to_var and ak.from_var: convert regular dimensions to and from variable dimensions with a high-level function #551

jpivarski opened this issue Nov 18, 2020 · 0 comments · Fixed by #553
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feature New feature or request good first issue Good for newcomers
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This would be Python only, and would take an axis parameter (most likely use recursively_apply).

RegularArray → ListOffsetArray can use the existing RegularArray::toListOffsetArray64 function from the C++ side.

ListOffsetArray → RegularArray can use the existing ListOffsetArray::toRegularArray and ListArray::toRegularArray, also from the C++ side.

So really, 90% of these two functions already exist. This is a super-easy project and would be a good introduction if anyone's interested in learning how things work.
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ak.with_field should not right-broadcast (by default). scikit-hep/awkward
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