Re: list of unique values from a TTree

Noel,

> There are no limits to the length of the array here (just your memory) and
> tree_to_ndarray is fast since the conversion is performed by a compiled C
> extension module.

using a C extension module for the conversion makes no difference (execution within the C code itself is faster, though), as in the end, calls still go through the same CPython API that does the conversion. Numpy does benefit from a customized buffer interface, but that'd only work for builtin types.

Best regards,

            Wim

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