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


is an option for BinaryRead, BinaryWrite and related functions that specifies what ordering of bytes should be assumed for your computer system.
  • +1 corresponds to big endian (appropriate for PowerPC and many other processors); -1 corresponds to little endian (appropriate for x86 processors).
  • +1 corresponds to having the most significant byte first; -1 to having the least significant byte first.
New in 5.2