On Tue, Dec 9, 2008 at 21:01, Charles R Harris <[EMAIL PROTECTED]> wrote: > > > On Tue, Dec 9, 2008 at 1:40 PM, Robert Kern <[EMAIL PROTECTED]> wrote: >> >> On Tue, Dec 9, 2008 at 09:51, Nadav Horesh <[EMAIL PROTECTED]> 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
