[R] basic math question?

From: AP05 <jeffmiller_at_alphapoint05.net>
Date: Sat, 19 May 2007 17:30:28 -0400


This seems like it's easy but I can't seem to get it.    

My equation is (a^b)/c = d.  

I know that I can solve for b via  

log(d*c) / log(a) = b    

However, I don't really have d in the first place I have d/sum(d) values...no d's...just d/sum(d) values that all add to 1.0  

So, for example, if my data is  

a=4,9,12,3
b=unknown
c=12,18,13,20

d/sum(d)=43,45,23,18  

I need an estimate of b. How can I do model and code this?  

Again, b is a power term of a and b^a are divided by c.  

Thank you,
Jeff    

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