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Integer64

  • Import can read any file as a sequence of signed 64-bit integers.
  • Export writes a list of integers in the range to a binary file.

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 following reference pages for full general information:
  • Import, Exportimport from or export to a file
    CloudImport, CloudExportimport from or export to a cloud object
    ImportString, ExportStringimport from or export to a string
    ImportByteArray, ExportByteArrayimport from or export to a byte array

Import Elements

  • General Import elements:
  • "Elements" list of elements and options available in this file
    "Summary"summary of the file
    "Rules"list of rules for all available elements
  • 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)Summary of the most common use cases

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

In[1]:=1
✖
https://wolfram.com/xid/0dxdtf6d4p-n7bboa
Out[1]=1

Verify that the correct number of bytes was written:

In[2]:=2
✖
https://wolfram.com/xid/0dxdtf6d4p-pya5ew
Out[2]=2

Convert the binary data back to an expression:

In[3]:=3
✖
https://wolfram.com/xid/0dxdtf6d4p-qfp16k
Out[3]=3

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

In[4]:=4
✖
https://wolfram.com/xid/0dxdtf6d4p-gq8e0
Out[4]=4