This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)


unpacks expr so that its internal representation is not a packed array.
  • Using FromPackedArray will not change results generated by Mathematica, but can reduce speed of execution and increase memory usage.
  • If expr is not a packed array, FromPackedArray[expr] returns expr unchanged.