Real128

Uniform sequence of IEEE quad-precision numbers.
Binary data format.
  • Import can read arbitrary binary data as a sequence of quad-precision numbers.
  • Export can convert a list of arbitrary integers or reals to binary quad-precision numbers.

Import and ExportImport and Export

  • Import["file", "Real128"] imports any file as 128-bit IEEE quad-precision numbers, returning a packed array of real numbers.
  • Export["file", list, "Real128"] exports a list of real numbers to file.
  • Import["file", {"Real128", elem}] or Import["file", elem ] imports the specified element from file.
  • Import["file", {"Real128", {elem1, elem2, ...}}] imports multiple elements.
  • See the reference pages for full general information on Import and Export.
  • ImportString and ExportString support the Real128 format.

ElementsElements

  • 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 element.
  • Import["file", {"Real128", n}] reads the n^(th) quad-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.

OptionsOptions

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

ExamplesExamplesopen allclose all

Basic Examples (1)Basic Examples (1)

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

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

Convert the previous result back to Mathematica numbers:

In[2]:=
Click for copyable input
Out[2]=
New in 5.1 | Last modified in 6
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