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Why isn't the output of RandomChoice a packed array? For instance:

RandomChoice[{.5, .2, .3} -> {1, 2, 3}, 10] Developer`PackedArrayQ @ %

{1, 2, 3, 1, 3, 1, 1, 2, 3, 3}

False

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In order for RandomChoice to produce a packed array, the RHS of the rule needs to be packed:

pQ = Developer`PackedArrayQ; pack = Developer`ToPackedArray; pQ @ RandomChoice[pack[{.5, .2, .3}] -> pack[{1, 2, 3}], 10] pQ @ RandomChoice[pack[{.5, .2, .3}] -> {1, 2, 3}, 10] pQ @ RandomChoice[{.5, .2, .3} -> pack[{1, 2, 3}], 10]

True

False

True

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    $\begingroup$ applies to RandomSample as well $\endgroup$ Commented Feb 8, 2018 at 17:04

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