MathGroup Archive 1996

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double-extended floating point numbers?

  • To: mathgroup at
  • Subject: [mg4157] double-extended floating point numbers?
  • From: John Bunda <bunda at>
  • Date: Sat, 8 Jun 1996 13:24:02 -0400
  • Organization: Centaur Technology, Inc.
  • Sender: owner-wri-mathgroup at

I need to be able to read and write 80-bit "long double" floats 
(a.k.a. extended double 80-bit IEEE floating point format) to 
interface other floating hardware with Mathematica.  

I just found out that Mathlink for Windows does not correctly
support the long double format, due to a bug that WRI tells 
me won't be fixed any time soon.

The Binary Files package doesn't support long doubles either, 
but looks like it could be made to with a little hackery.
Has anyone successfully done this, or found another way
to get Mathematica to talk this floating point format?

Thanks in advance.



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