[Pdx-pm] log base 10
darthsmily
darthsmily at verizon.net
Thu Apr 8 22:15:35 CDT 2004
*coughpendanticcough*
;)
He didn't specify a language, so I thought I'd be a smart ass and toss
out some basic code.
Tkil wrote:
>>>>>>"DS" == darthsmily <darthsmily at verizon.net> writes:
>>>>>>
>>>>>>
>
>DS> Log10 = Log(number) / 2.30258509299405
>
>For the people who wonder where the magic number comes from: the
>logarithm of x in base b can be calculated by dividing the natural log
>of x by the natural log of b. In formula form (so far as ascii art
>allows):
>
> ln x
> log x = ----
> b ln b
>
>I don't remember enough math to tell you what the appropriate domains
>would be, but for simple calculations, this should be sufficient.
>
>In this case, b is 10, so we have
>
> log10(x) = ln(x) / ln(10)
>
>And ln(10) is 2.30258509299404568402, at least according to M_LN10 in
>/usr/include/math.h. :)
>
>t.
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