Background & Context

    • Uniform sequence of IEEE double-precision numbers.
    • Binary data format.

Import & Export

  • Import["file","Real64"] imports any file as 64-bit IEEE double-precision numbers, returning a packed array of real numbers.
  • Export["file",list,"Real64"] exports a list of real numbers to file.
  • Import["file",{"Real64",elem}] or Import["file",elem ] imports the specified element from file.
  • Import["file",{"Real64",{elem1,elem2,}}] imports multiple elements.
  • See the reference pages for full general information on Import and Export.
  • ImportString and ExportString support the Real64 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 real numbers
  • By default, Import and Export use the "Data" element.
  • Import["file",{"Real64",n}] reads the n^(th) double-precision number from file.
  • Import returns Infinity for IEEE "infinity", and Indeterminate for IEEE "notanumber".
  • Trailing bytes are ignored if the size of the imported file is not a multiple of the data size.



Basic Examples  (1)

Convert a list of integers and reals to IEEE double-precision numbers:

Convert the previous result back to Wolfram Language numbers: