Thanks! -- David
On Sat, May 23, 2009 at 4:44 PM, Ted Dunning <ted.dunn...@gmail.com> wrote: > David, > > Actually, I just looked around and didn't see much interesting and cleanly > available along this line so I just wrote a digamma function. > > See https://issues.apache.org/jira/browse/MATH-267 for a tar file containing > an implementation with test cases. I went ahead and copyrighted this for > apache use. It contains source, comments and test values derived from > mathematica. > > In the process, I discovered that the R implementation of digamma is really > crappy for medium small positive values of x. > > On Sat, May 23, 2009 at 2:26 PM, David Hall <d...@cs.stanford.edu> wrote: > >> "Share" is too strong. He released a number of functions in the >> library I linked to, and the only requirement of the license seems to >> be we maintain the copyright notice and say what we changed: >> >> /* Copyright (c) 1995-2003 by Radford M. Neal >> * >> * Permission is granted for anyone to copy, use, modify, or distribute >> this >> * program and accompanying programs and documents for any purpose, >> provided >> * this copyright notice is retained and prominently displayed, along with >> * a note saying that the original programs are available from Radford >> Neal's >> * web page, and note is made of any changes made to the programs. The >> * programs and documents are distributed without any warranty, express or >> * implied. As the programs were written for research purposes only, they >> have >> * not been tested to the degree that would be advisable in any important >> * application. All use of these programs is entirely at the user's own >> risk. >> */ >> >> I can also just email him directly. >> >> -- David >> >> >> On Sat, May 23, 2009 at 2:22 PM, Ted Dunning <ted.dunn...@gmail.com> >> wrote: >> > Avoid Numerical Recipes if you want to avoid license issues. Their >> > publisher has a strong history of being very strict about their >> > interpretation of what they think they own. >> > >> > If Radford Neal has an implementation that he would share, I would count >> > that as a great contribution. >> > >> > On Sat, May 23, 2009 at 2:09 PM, David Hall <d...@cs.stanford.edu> >> wrote: >> > >> >> >> >> Alternatively, I can try to track down a book (Numerical Recipes?) >> >> with pseudocode. >> > >> > >> > >> > >> > -- >> > Ted Dunning, CTO >> > DeepDyve >> > >> > > > > -- > Ted Dunning, CTO > DeepDyve > > 111 West Evelyn Ave. Ste. 202 > Sunnyvale, CA 94086 > http://www.deepdyve.com > 858-414-0013 (m) > 408-773-0220 (fax) >
