On 02/ 4/12 05:00 AM, Dima Pasechnik wrote:
On Saturday, 4 February 2012 11:53:35 UTC+8, Dr. David Kirkby wrote:
On 2 February 2012 23:05, rjf<> wrote:
I don't know about arithmetic on ARM specifically, but there is
something
wrong with a gamma() function that fails to return an integer (perhaps
in float format) when it is
given an integer argument (perhaps in float format), and the answer is
exactly representable
as an integer in float format.
Would you say this is true for any function foobar(), or gamma() in
particular?
It's well-known how to compute gamma() better than it is implemented in
(e)glibc, the prevalent Linux libc implementation,
which computes exp(lgamma()) rather than gamma() directly.
See e.g.
http://oai.cwi.nl/oai/asset/10080/10080A.pdf
Perhaps I should give it to a student, to re-write in C or Cython
If there are no significant disadvantages to this algorithm, it would be worth
trying to get the gnu developers to use it in the c library. The best chance of
doing that would be to write it in C.
Dave
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