On Sun, Apr 11, 2010 at 10:01 AM, bb <bblo...@arcor.de> wrote:
> Tnx for helping. I did some more experimentation. I dont want to bother you,
> but if you have some time and some pation I would be thankfull for one more
> explanation. Your tip works as expected, but if I use the method n() I still
> get 53 bit of significant bits??? (see last expression of the snippet.)
>
> I argue, that the parameter of n() is set elsewhere in another Variable than
> RealNumber?
Yes, in the code for n, we have the following:
if prec is None:
if digits is None:
prec = 53
else:
prec = int((digits+1) * 3.32192) + 1
so it just defaults to 53 if nothing is passed in. The RealNumber =
RealField(137) just changes the precision for floating point literals
entered on the command line.
--Mike
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