Am 20.03.2014 22:55, schrieb Christophe Bal:
Hello.
There is a difference between a decimal, ie a rational which can be written
N/10^P and a float. A float number is an approximation so you can't really
see it as rationals. No ?
One can see it as a rational. Then it's not a field because not all
combinations of values and operations will return another float.
Or one can see it as a IEEE model number (basically, an interval of
rationals, plus some extra values). That's a field, but the semantics
are complicated and unreliable.
See
www.ucs.cam.ac.uk/docs/course-notes/unix-courses/NumericalPython/files/paper_1.pdf
for a rough overview of the messy details.
Both approaches have their uses, but I'm unsure whether any of them adds
value to SymPy.
--
You received this message because you are subscribed to the Google Groups
"sympy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sympy.
To view this discussion on the web visit
https://groups.google.com/d/msgid/sympy/532C02BE.6080700%40durchholz.org.
For more options, visit https://groups.google.com/d/optout.
