Integer64

Background & Context

    • Uniform sequence of signed 64-bit integers.
    • Binary data format.

Import & Export

  • Import["file","Integer64"] imports an arbitrary file as a sequence of signed 64-bit integers, returning a packed array of integers in the range .
  • Export["file",list,"Integer64"] exports a list of integers in the range to a sequence of binary 64-bit integers.
  • Import["file",{"Integer64",elem}] or Import["file",elem ] imports the specified element from file.
  • Import["file",{"Integer64",{elem1,elem2,…}}] imports multiple elements.
  • See the reference pages for full general information on Import and Export.
  • ImportString and ExportString support the Integer64 format.

Import Elements

  • General Import elements:
  • "Elements" elements and options available in this file
    "Rules"full rules for each element and option
    "Options"rules for options, properties, and settings
  • Data representation element:
  • "Data"list of integers in the range
  • By default, Import and Export use the "Data" element.
  • Import["file",{"Integer64",n}] gives the n^(th) 64-bit integer.
  • Trailing bytes are ignored if the size of the imported file is not a multiple of the data size.

Options

Examples

Basic Examples  (1)

Convert a list of integers to a string representing a sequence of binary 64-bit integers:

Verify that the correct number of bytes was written:

Convert the binary data back to an expression:

Import the same data, assuming it represents an array of unsigned integers:

Introduced in 2004
 (5.1)
 |
Updated in 2007
 (6.0)