Integer64

Background

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

Import and 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.

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

  • General option:
  • ByteOrdering-1what byte ordering to use
  • Import option:
  • "HeaderBytes"0how many bytes to skip at the beginning of the file

Examples

Basic Examples  (1)

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

In[1]:=
Click for copyable input
Out[1]=

Verify that the correct number of bytes was written:

In[2]:=
Click for copyable input
Out[2]=

Convert the binary data back to an expression:

In[3]:=
Click for copyable input
Out[3]=

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

In[4]:=
Click for copyable input
Out[4]=

See Also

"Binary"  "Bit"  "Byte"  "Character8"  "Character16"  "Integer8"  "Integer16"  "Integer24"  "Integer32"  "Integer128"  "UnsignedInteger8"  "UnsignedInteger16"  "UnsignedInteger24"  "UnsignedInteger32"  "UnsignedInteger64"  "UnsignedInteger128"  "Real32"  "Real64"  "Real128"  "Complex64"  "Complex128"  "Complex256"  "String"

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