[Numpy-discussion] Importance of order when summing values in anarray

frank wang f.yw@hotmail....
Wed Dec 10 12:00:19 CST 2008

On my two systems with Intel Core2 DUO, finfo(float128) gives me the nameerro, "NameError: name 'float128' is not defined". Why?
Frank> Date: Tue, 9 Dec 2008 21:10:32 -0600> From: robert.kern@gmail.com> To: numpy-discussion@scipy.org> Subject: Re: [Numpy-discussion] Importance of order when summing values in anarray> > On Tue, Dec 9, 2008 at 21:01, Charles R Harris> <charlesr.harris@gmail.com> wrote:> >> >> > On Tue, Dec 9, 2008 at 1:40 PM, Robert Kern <robert.kern@gmail.com> wrote:> >>> >> On Tue, Dec 9, 2008 at 09:51, Nadav Horesh <nadavh@visionsense.com> wrote:> >> > As much as I know float128 are in fact 80 bits (64 mantissa + 16> >> > exponent) so the precision is 18-19 digits (not 34)> >>> >> float128 should be 128 bits wide. If it's not on your platform, please> >> let us know as that is a bug in your build.> >> > I think he means the actual precision is the ieee extended precision, the> > number just happens to be stored into larger chunks of memory for alignment> > purposes.> > Ah, that's good to know. Yes, float128 on my Intel Mac behaves this way.> > In [12]: f = finfo(float128)> > In [13]: f.nmant> Out[13]: 63> > In [14]: f.nexp> Out[14]: 15> > -- > Robert Kern> > "I have come to believe that the whole world is an enigma, a harmless> enigma that is made terrible by our own mad attempt to interpret it as> though it had an underlying truth."> -- Umberto Eco> _______________________________________________> Numpy-discussion mailing list> Numpy-discussion@scipy.org> http://projects.scipy.org/mailman/listinfo/numpy-discussion
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