1. RE: logs and antilogs (to Kat)
Kat wrote:
> I have been looking all over the net for a formula to calculate
> logs and antilogs for any given number, ....
Hi Kat,
If I remember correctly you were seeking some time ago for an (almost?)
'exact' representation of PI for the computer.
With relation to this, may I ask you for what purpose do you need exp()
and log() for 'any given number'? I.e., do you mean to express
"exp(1.0e+300)" in a program?
Have a nice day, Rolf
2. RE: logs and antilogs (to Kat)
> If I remember correctly you were seeking some time ago for an (almost?)
> 'exact' representation of PI for the computer.
> With relation to this, may I ask you for what purpose do you need exp()
> and log() for 'any given number'? I.e., do you mean to express
> "exp(1.0e+300)" in a program?
>
> Have a nice day, Rolf
Almost exact? Is this really needed? Im just curious. In my distant
youth in one my classrooms, PI was on a banner spanning the entire
classroom across the outside walls. Just for fun (because this class
was quite boring) I would memorize sections of it. After I could recide
40 or so places, I was reading a nice article on the universe and it was
stated therein that PI to 31 decimal places was enough to accurately
measure the circumference of the galaxy to within 3 - 5 atoms (or
something really ludicrus). Needless to say I stopped memorizing it.
If you need PI to any certain degree, I can still recite it out to quite
a few places... Hmm, let me see. 3.1415926535897932384626433833 (last
digit is rounded from 27). Its about 21 more places than I have ever
needed :P
3. RE: logs and antilogs (to Kat)
On 29 Oct 2002, at 12:58, rolf.schroeder at desy.de wrote:
>
> Kat wrote:
>
> > I have been looking all over the net for a formula to calculate
> > logs and antilogs for any given number, ....
>
> Hi Kat,
>
> If I remember correctly you were seeking some time ago for an (almost?)
> 'exact' representation of PI for the computer.
Not me.
> With relation to this, may I ask you for what purpose do you need exp()
> and log() for 'any given number'? I.e., do you mean to express
> "exp(1.0e+300)" in a program?
Because my bignum .e for basic math seems to be working to over a million
significant digits, and someone asked for log(). Besides, i hate to ask the
computer for a math answer, and get something like 2.99999999 when i
know the answer is 3.
Kat
