Real64

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 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 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 "not‐a‐number".
  • 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 and reals to IEEE double-precision numbers:

Convert the previous result back to Wolfram Language numbers: