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...he model df <- read.table("data.txt", header=T); df1 = na.omit(df[, 1:2]) library(nls); fm = nls(y ~ (x+d)^(-exp(lb)), data = df1, start=c(lb = 0, d = 0),alg = 'plinear', trace = TRUE); I would be glad if someone can help me. Thanks & Regards, Sai Charan Komanduru >To: Komanduru Sai C <sck2348 at cacs.louisiana.edu> >Cc: r-help at stat.math.ethz.ch >Subject: Re: [R] nls >From: Douglas Bates <bates at stat.wisc.edu> >Date: 19 Feb 2003 08:33:52 -0600 >User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Common Lisp) >MIME-Versio...

...at the university of Louisiana at Lafayette. I have a question. I have an equation with 3 unknowns. f= P/ (r+p) pow(B). I have values of f for different r's. Can i use R to find the P,p,B values which are constants. The equation is Manderbolts equation. Thanks and regards, Sai Charan Komanduru Research Assistant, CACS ULL

Hi, I am trying to install R on Windows. I copied the set up binary. But it is corrupted on all the mirror sites. Please let know an alternative for getting the software. Thanks, Sai

Its possible to corrupt the binary if you actually open it in a browser, and the browser tries to display it, and then you save it. Have you tried right-clicking on the link to download it? Robert. On Thu, 30 Jan 2003, saicharan komanduru wrote: > Hi, > I copied the binary setup file for windows. I tried > to install but it says the binary is corrupted. I > tried getting the files from many mirror sites but the > same probelm is repeating. Please let me know if i > have an alternative. > > Thanks and Regar...

Hi, I am using nls library df <- read.table("data.txt", header=T); library(nls); fm <- nls(y ~ a*(x+d)^(-b), df, start=list(a=max(df->y,na.rm=T)/2,b=1,d=0)); coef(fm); q(); When i am using the above routine i am getting the following error Error in nlsModel(formula, mf, start) : singular gradient matrix at initial parameter estimates Can some one help me in this.