Re: [Rd] Cholesky update/downdate
Hi Douglas, thanks for your answer. My question indeed arises from a sparse matrix context: 'A' is sparse symmetric, and 'C' must also be sparse since it would otherwise fill. It comes from a Bayes regression with a very large number of parameters; a loop over blocks will do the job in my specific case. Yet I wondered about this since similar need for covariance updating may arise from linear filtering or kriging. Douglas Bates wrote The CHOLMOD library provides sparse matrix methods, especially the Cholesky decomposition and modifications to that decomposition, which is where the name comes from. Do you expect to work with sparse matrices? I haven't seem too much code for update/downdate operations on the Cholesky decomposition for dense matrices. There were rank-1 update/downdate methods in Linpack but they didn't make it through to Lapack. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] CRAN link broken
The packages link on CRAN (http://cran.at.r-project.org/) seems to be broken. Paul Object not found! The requested URL was not found on this server. The link on the referring pagehttp://cran.at.r-project.org/navbar.html seems to be wrong or outdated. Please inform the author of that page http://cran.at.r-project.org/navbar.html about the error. If you think this is a server error, please contact the webmaster mailto:%5bno%20address%20given%5d. Error 404 cran.at.r-project.orghttp://cran.at.r-project.org/ Fri Dec 30 22:20:48 2011 Apache/2.2.21 (Debian) __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] CRAN link broken
On Fri, Dec 30, 2011 at 4:32 PM, Paul Gilbert pgilbert...@gmail.com wrote: The packages link on CRAN (http://cran.at.r-project.org/) seems to be broken. Paul Object not found! The requested URL was not found on this server. The link on the referring pagehttp://cran.at.r-project.org/navbar.html seems to be wrong or outdated. Please inform the author of that page http://cran.at.r-project.org/navbar.html about the error. If you think this is a server error, please contact the webmaster mailto:%5bno%20address%20given%5d. Error 404 cran.at.r-project.orghttp://cran.at.r-project.org/ Fri Dec 30 22:20:48 2011 Apache/2.2.21 (Debian) Presumably this will propagate to the mirrors shortly, as well, if it has not happened already. -- Statistics Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] CRAN link broken
This is not the CRAN webmaster's address[*], and the problem has been reported several times already to the proper places. No one reading this list apart from the handful with CRAN administrator rights can do anything about this. The package repository is still there, and the check information is still up (via http://cran.r-project.org/web/checks/check_summary.html). The only thing that appears to be missing is the web-formatted summary information. That is secondary information, and it looks like the web/packages area needs to be regenerated. My memory is that some of the mirrors do not auto-delete, and so will remain populated. I believe http://stat.ethz.ch/CRAN/web/packages/ to be one of those and it looks intact. [*] I believe that to be cranad...@r-project.org On 30/12/2011 21:32, Paul Gilbert wrote: The packages link on CRAN (http://cran.at.r-project.org/) seems to be broken. Paul Object not found! The requested URL was not found on this server. The link on the referring pagehttp://cran.at.r-project.org/navbar.html seems to be wrong or outdated. Please inform the author of that page http://cran.at.r-project.org/navbar.html about the error. If you think this is a server error, please contact the webmaster mailto:%5bno%20address%20given%5d. Error 404 cran.at.r-project.orghttp://cran.at.r-project.org/ Fri Dec 30 22:20:48 2011 Apache/2.2.21 (Debian) __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel -- Brian D. Ripley, rip...@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
