At 12:24 AM 6/19/2007, Boris wrote:
>I can't for the life of me figure out how to get the roots for this simple
>(but sovable only iteratively) equation in R:
>
>x = z*(1-(1-2/z)^y
>
>where x and y are known, and z is unknown. In Matlab, this amounts to:
>
>[my.solution] = solve('x = z*(1-(1-2/z)^y')
>my.solution.real = solution(y-1,y)
>
>% bottom line displays non-imaginary solution (last element)
><snip>1. Your equation is syntactically incorrect. It is missing a ")". Ditto for your Matlab example. 2. Are you looking for an analytical (symbolic) solution? If so, I don't believe one exists (if you place a ")" after y). 3. To find numerical roots, see uniroot(). 4. If you want more help, you'll have to specify domains or values for x and y. ================================================================ Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: [EMAIL PROTECTED] Least Cost Formulations, Ltd. URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239 Fax: 757-467-2947 "Vere scire est per causas scire" ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
