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based on an earlier version of the Wolfram Language.
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ToPackedArray

ToPackedArray[expr]
uses packed arrays if possible in the internal representation of expr.
  • Using will not change results generated by Mathematica, but can enhance speed of execution and reduce memory usage.
  • is effectively used automatically by many functions that generate large lists.
  • will successfully pack full lists of any depth containing machine-sized integers and machine-sized approximate real and complex numbers.
  • will when possible convert entries in expr to be of the specified type.
  • Only machine-sized numbers can be stored in packed form.
  • The option Tolerance->tol can be used to specify when small numerical values can be ignored in conversion to more restrictive types, and when they must prevent conversion to packed form.