Full_Name: Hao Yu
Version: 1.1.0 and 1.1.1
OS: Redhat 7 Linux (intel)
Submission from: (NULL) (129.100.45.161)
Hi, I am not sure this is well know problem but I could not find anyone mention
it.
The problem is related to build R on redhat 7. After got src.rpm and tried to
rebuild it, it failed on testing accuracy. Further it shows that under R,
.Machine gives some numbers that maybe are not correct. I also tried the most
recent one (November 6) and failed. The strange thing is that the R (1.1.0) that
comes with powertools of redhat 7 has exactly the same problem. All three R
gives the same results for .Machine. See the following outputs.
Thanks
Hao Yu
PS. One system has Pentium III 600Mhz and 256RDRAM, Intel CC820 motherboard;
Another has Pentium III 800Mhz and 256 SDRAM, ASUS BX motherboard.
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Version 1.1.1 Patched (November 6, 2000)
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> .Machine
$double.eps
[1] 1.084202e-19
$double.neg.eps
[1] 5.421011e-20
$double.xmin
[1] 0.25
$double.xmax
[1] 0.5
$double.base
[1] 2
$double.digits
[1] 64
$double.rounding
[1] 5
$double.guard
[1] 0
$double.ulp.digits
[1] -63
$double.neg.ulp.digits
[1] -64
$double.exponent
[1] 1
$double.min.exp
[1] -2
$double.max.exp
[1] -2
$integer.max
[1] 2147483647
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
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hyu@stats.uwo.ca writes:> Full_Name: Hao Yu > Version: 1.1.0 and 1.1.1 > OS: Redhat 7 Linux (intel) > Submission from: (NULL) (129.100.45.161) > > > Hi, I am not sure this is well know problem but I could not find anyone mention > it. > The problem is related to build R on redhat 7. After got src.rpm and tried to > rebuild it, it failed on testing accuracy. Further it shows that under R, > .Machine gives some numbers that maybe are not correct. I also tried the most > recent one (November 6) and failed. The strange thing is that the R (1.1.0) that > comes with powertools of redhat 7 has exactly the same problem. All three R > gives the same results for .Machine. See the following outputs.We (R-core + Martyn Plummer who builds the RPM files on CRAN) discussed this earlier today. It is a problem with the RedHat "unofficical 2.96" gcc compiler which seems to be overly zealous on some optimizations. The build is said to work if you build R unoptimized. We're strongly considering to say that R *requires* another gcc compiler rather than trying to work around bugs in a compiler that should never have been released. The powertools version appears to have been built by disabling the regression test (make check)! It might be worth filing a formal bug report with RedHat on that matter. (It is not merely a matter of cosmetics, those machine constants actually get used for determining convergence criteria and the like. Having them set too low could send algorithms into infinite loops.) I think Martyn Plummer is about to produce a working RPM based on a better compiler. However, if you want to compile add-on packages, it might still be a good idea to install an alternative compiler for yourself. -- 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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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