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There are now several R geographic user groups, and a few have mailing lists on the R mailing list system. Thanks to Martin M, there's also a pointer to a page I'm maintaining to list/describe the groups. The page is at http://macnash.telfer.uottawa.ca/RUG.html Contact me if you have a listing. I'm prepared to wikify it if there is sufficient interest. John Nash

...ith at most box constraints. Within that caveat, the codes are working, but they may not be fully bullet-proof or documented. We plan more material as we can get round to it. For discussion, with rather up and down traffic that takes various directions, I also run a wiki called optimx at http://macnash.telfer.uottawa.ca/optimx/doku.php but only the first page is publicly visible as we use it to discuss ideas that may be half (or less!) baked. However, I'm happy to give logins on request to genuine R folk and there have been some quite useful ideas exchanged. Unfortunately, one of my collea...

...t an upper bound on k1 too. The problem is discussed in the book I published with Mary Walker-Smith in 1987, but I think our treatment is still only an expedient. Note that the software was in BASIC, but it still runs (DOSBOX is a friend for Linux users). That book can be obtained free from http://macnash.telfer.uottawa.ca/nlpe/. Best, JN On 11/18/2011 06:00 AM, r-help-request at r-project.org wrote: > Message: 4 > Date: Thu, 17 Nov 2011 20:42:12 +0800 > From: Jinsong Zhao <jszhao at yeah.net> > To: "r-help at r-project.org" <r-help at r-project.org> > Subjec...

...======================= -- John C. Nash, School of Management, University of Ottawa, Vanier Hall 451, 136 Jean-Jacques Lussier Private, P.O. Box 450, Stn A, Ottawa, Ontario, K1N 6N5 Canada email: nashjc on mail server uottawa.ca, voice mail: 613 562 5800 X 4796 fax 613 562 5164, Web URL = http://macnash.admin.uottawa.ca "Practical Forecasting for Managers" web site is at http://www.arnoldpublishers.com/support/nash/

...Any advice welcome. -- John C. Nash, School of Management, University of Ottawa, Vanier Hall 451, 136 Jean-Jacques Lussier Private, P.O. Box 450, Stn A, Ottawa, Ontario, K1N 6N5 Canada email: nashjc on mail server uottawa.ca, voice mail: 613 562 5800 X 4796 fax 613 562 5164, Web URL = http://macnash.admin.uottawa.ca "Practical Forecasting for Managers" web site is at http://www.arnoldpublishers.com/support/nash/

Hi, I've noticed I get different results fitting a function to some data on my laptop to when I do it on my computer at work. Here's a code snippet of what I do: ##------------------------------------------------------------------ require(circular) ## for Bessel function I.0 ## Data: dd <- c(0.9975948929787, 0.9093316197395, 0.7838819026947, 0.9096108675003, 0.8901804089546,

Hi all I have a set of data whose scatter plot shows a very nice power relationship. My problem is when I fit a Power Trend Line in an Excel spreadsheet, I get the model y= 44.23x^2.06 with an R square value of 0.72. Now, if I input the same data into R and use model< -nls(y~ a*x^b , trace=TRUE, data= my_data, start = c(a=40, b=2)) I get a solution with a = 246.29 and b = 1.51. I have tried