[Rcpp-devel] trans() changed in latest RcppArmadillo
Hello Dr. Sanderson. Thank you, so much, for your work; along with the work of Dirk and Romain, your tools make it possible for me to have impact I otherwise would never achieve. Anyway, I separately tested my (typical) use of trans() in a simple code and received no problems. I have various Rcpp-written functions that perform Bayesian regression modeling; so I'm simulating samples from a set of conditional distributions. Until last night, I'd used these functions for some months on a particular dataset without incident (though I've intermittently tuned them for speed and functionality). Anyway, further analysis suggests that I'm experiencing numerical instability not previously an issue. I noted that Armadillo included some changes for faster inverse computation on small size matrices. Was there an algorithm change that might allow such instability? I intend to test by replacing inv() with pinv(). Thanks, Terrance -----Original Message----- From: Conrad Sand [mailto:conradsand.rcpp at gmail.com] Sent: Monday, May 30, 2011 6:34 AM To: rcpp-devel at r-forge.wu-wien.ac.at Cc: Savitsky, Terrance Subject: Re: trans() changed in latest RcppArmadillo
On 30 May 2011, Terrance Savitsky wrote:
Hello, After upgrading to the 0.2.21 release of RcppArmadillo, my previously working code (across many functions) ceased working (on a Windows XP installation). I re-installed the previous version
(0.2.20)
from CRAN (via a server location not yet updated to 0.2.21); didn't
fix it.
The timing may be a coincidence, though reading the post on trans() encourages me to make this post. While I use 'trans' across
my
functions, it is not applied on complex-valued matrices; only real-valued. So the prior post wouldn't explain my issue.
Hi, I'm the main author of Armadillo. I'm interested in hearing about all regressions -- can you provide more details ? There have been a lot of changes between Armadillo 1.2 and the latest beta (1.99.3). I'd like to shake out all known bugs before releasing 2.0. Cheers, Conrad -- Dr Conrad Sanderson : Sr Research Scientist : NICTA : http://arma.sf.net/cs __________________________________________________________________________ This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message.