OpenEuphoria

Re: logs and antilogs

• Posted by Kat <kat at kogeijin.com> Oct 26, 2002
• 474 views

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