Full_Name: Hans Peter Wolf Version: 1.2.1 OS: hpux10.20 Submission from: (NULL) (129.70.84.25) dbeta computes a wrong result with parameters (1.3,1)> versionplatform hppa2.0-hp-hpux10.20 arch hppa2.0 os hpux10.20 system hppa2.0, hpux10.20 status major 1 minor 2.1 year 2001 month 01 day 15 language R> dbeta((0:5)/5,1.3,1.0)[1] 0.0 0.0 0.0 0.0 0.0 1.3> dbeta((0:5)/5,1.30001,1.0)[1] 0.0000000 0.8021373 0.9875537 1.1152952 1.2158296 1.3000100> dbeta((0:5)/5,1.29999,1.0)[1] 0.0000000 0.8021508 0.9875566 1.1152895 1.2158163 1.2999900 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
pwolf@wiwi.uni-bielefeld.de writes:> Full_Name: Hans Peter Wolf > Version: 1.2.1 > OS: hpux10.20 > Submission from: (NULL) (129.70.84.25) > > > dbeta computes a wrong result with parameters (1.3,1) > > > version > platform hppa2.0-hp-hpux10.20 > arch hppa2.0 > os hpux10.20 > system hppa2.0, hpux10.20 > status > major 1 > minor 2.1 > year 2001 > month 01 > day 15 > language R > > dbeta((0:5)/5,1.3,1.0) > [1] 0.0 0.0 0.0 0.0 0.0 1.3 > > dbeta((0:5)/5,1.30001,1.0) > [1] 0.0000000 0.8021373 0.9875537 1.1152952 1.2158296 1.3000100 > > dbeta((0:5)/5,1.29999,1.0) > [1] 0.0000000 0.8021508 0.9875566 1.1152895 1.2158163 1.2999900Hm. Doesn't happen with 1.2.3 on Linux and dbeta.c hasn't changed inbetween. Any chance of getting you to step through the computations with a debugger on you machine? -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
On 6 Jun 2001, Peter Dalgaard BSA wrote:> pwolf@wiwi.uni-bielefeld.de writes: > > > Full_Name: Hans Peter Wolf > > Version: 1.2.1 > > OS: hpux10.20 > > Submission from: (NULL) (129.70.84.25) > > > > > > dbeta computes a wrong result with parameters (1.3,1) > > > > > version > > platform hppa2.0-hp-hpux10.20 > > arch hppa2.0 > > os hpux10.20 > > system hppa2.0, hpux10.20 > > status > > major 1 > > minor 2.1 > > year 2001 > > month 01 > > day 15 > > language R > > > dbeta((0:5)/5,1.3,1.0) > > [1] 0.0 0.0 0.0 0.0 0.0 1.3 > > > dbeta((0:5)/5,1.30001,1.0) > > [1] 0.0000000 0.8021373 0.9875537 1.1152952 1.2158296 1.3000100 > > > dbeta((0:5)/5,1.29999,1.0) > > [1] 0.0000000 0.8021508 0.9875566 1.1152895 1.2158163 1.2999900 > > Hm. Doesn't happen with 1.2.3 on Linux and dbeta.c hasn't changed > inbetween. Any chance of getting you to step through the computations > with a debugger on you machine?It does happen on Solaris 2.7, though, which might give Peter a means to look at it on an earlier Solaris. -- Brian D. Ripley, ripley@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 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Prof Brian Ripley <ripley@stats.ox.ac.uk> writes:> > > > dbeta((0:5)/5,1.3,1.0) > > > [1] 0.0 0.0 0.0 0.0 0.0 1.3 > > > > dbeta((0:5)/5,1.30001,1.0) > > > [1] 0.0000000 0.8021373 0.9875537 1.1152952 1.2158296 1.3000100 > > > > dbeta((0:5)/5,1.29999,1.0) > > > [1] 0.0000000 0.8021508 0.9875566 1.1152895 1.2158163 1.2999900 > > > > Hm. Doesn't happen with 1.2.3 on Linux and dbeta.c hasn't changed > > inbetween. Any chance of getting you to step through the computations > > with a debugger on you machine? > > It does happen on Solaris 2.7, though, which might give Peter a means > to look at it on an earlier Solaris.Indeedy. Looks like we're passing a-1 and a+b-2 on to dbinom_raw as x and n respectively and this comes out with x > n due to roundoff so we get zero returned. Argh, how does one fix that? (It's usually the intel FPUs that pull that kind of stunt on us...) -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._