1. problem with euphoria's power()
Consider the following line of code:
? power(-8, 1/3)
I get the following error:
can't raise negative number to non-integer power.
Wrong! raising any number to 1/3 gives the cubed root, and anyone with even
a little math experience knows that all negative numbers have real cubed
roots. Same applies with 1 / <any odd integer>. So, what's the problem Rob?
regards,
Daryl van den Brink
3. Re: problem with euphoria's power()
- Posted by gertie at ad-tek.net
Aug 05, 2001
On 5 Aug 2001, at 20:09, daryl_vdb at HOTMAIL.COM wrote:
>
> Consider the following line of code:
>
> ? power(-8, 1/3)
>
> I get the following error:
>
> can't raise negative number to non-integer power.
>
> Wrong! raising any number to 1/3 gives the cubed root, and anyone with even
> a little math experience knows that all negative numbers have real cubed
> roots. Same applies with 1 / <any odd integer>. So, what's the problem Rob?
If we had the log10 function instead of the natural logs function, we could get
any root
or power by using that function:
atom = 10E(0.3 x log(1728))
-- atom = 12
Kat
4. Re: problem with euphoria's power()
>If we had the log10 function instead of the natural logs function, we could
>get any root
>or power by using that function:
>
>atom = 10E(0.3 x log(1728))
>-- atom = 12
>
>Kat
Here's some code I coppied from a math library I wrote a while ago. It lets
you get logarighms with any base. (10, 16 and 8 are sped up a little)
-- logarithms --
constant log10 = log(10),
log16 = log(16),
log8 = log(8)
global function declog(object x)
return log(x) / log10
end function
global function hexlog(object x)
return log(x) / log16
end function
global function octlog(object x)
return log(x) / log8
end function
global function customlog(object x, object base)
return log(x) / log(base)
end function
regards,
Daryl van den Brink
