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From: ark@alice.UucP (Andrew Koenig)
Newsgroups: net.lang.c
Subject: Re: Exponetiation
Message-ID: <5664@alice.uUCp>
Date: Thu, 19-Jun-86 09:51:37 EDT
Article-I.D.: alice.5664
Posted: Thu Jun 19 09:51:37 1986
Date-Received: Sat, 21-Jun-86 08:07:31 EDT
References: <366@bucsb.bu.edu.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 9

> I'm confused. I've been trying to figure out a quick and easy way
> to exponetiate to a fraction (ie. x^(4.25))  and also be able to
> figure out the power when given the base and the result.  

a^b is exp(b*ln(a)).  So, if x = a^b and you know a and x,

	exp(b*ln(a)) = x
	b * ln(a) = ln(x)
	b = ln(x) / ln(a)