1. logs and antilogs
I have been looking all over the net for a formula to calculate logs and
antilogs for any given number, but turned up zip. Can anyone suggest a
formula?
Kat
2. Re: logs and antilogs
Kat wrote:
> I have been looking all over the net for a formula to calculate logs and
> antilogs for any given number, but turned up zip. Can anyone suggest a
> formula?
I'm not sure if it got you right, maybe this is what you are looking
for:
type positive_not_1 (object x)
if atom(x) and x > 0 then
return x != 1
end if
return 0
end type
global function log_any (positive_not_1 b, object x)
-- general log() function
-- logarithm for base b and number (or sequence) x
-- in : b: real number > 0 and != 1
-- x: real number > 0 (or sequence of such numbers)
-- out: real number
return log(x)/log(b)
end function
? log_any(2, 32)
Regards,
Juergen
3. Re: logs and antilogs
On 27 Oct 2002, at 1:59, Juergen Luethje wrote:
>
> Kat wrote:
>
> > I have been looking all over the net for a formula to calculate logs and
> > antilogs for any given number, but turned up zip. Can anyone suggest a
> > formula?
>
> I'm not sure if it got you right, maybe this is what you are looking
> for:
>
>
> type positive_not_1 (object x)
> if atom(x) and x > 0 then
> return x != 1
> end if
> return 0
> end type
>
>
> global function log_any (positive_not_1 b, object x)
> -- general log() function
> -- logarithm for base b and number (or sequence) x
> -- in : b: real number > 0 and != 1
> -- x: real number > 0 (or sequence of such numbers)
> -- out: real number
>
> return log(x)/log(b)
Ok, what code is behind that line? What does log() do? I know what
logarithms are, and how to use them, i was using them back in 1969. But
they were in a table in a book. The ones i use now are in my calculators. I
opened the calculator, but couldn't find them. 
Kat
4. Re: logs and antilogs
Some useful formula can be found there as well as on other pages of this
site:
http://mathworld.wolfram.com/NaturalLogarithm.html
Regards
CChris
