"Jeff Lewis" <[EMAIL PROTECTED]> writes: > I'm attempting to compile and install R version 1.7.1 for my statistical > geneticists. It seems to compile correctly -- that is, it compiles > without errors -- but the regression test is failing in the following > manner: > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > > ## log > > stopifnot(all.equal(log(1:10), log(1:10, exp(1)))) > > stopifnot(all.equal(log10(30), log(30, 10))) > > stopifnot(all.equal(log2(2^pi), 2^log2(pi))) > > stopifnot(Mod(pi - log(exp(pi*1i)) / 1i) < .Machine$double.eps) > Error: Mod(pi - log(exp(pi * (0+1i)))/(0+1i)) < .Machine$double.eps is > not TRUE > Execution halted > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > > I'm compiling on Tru64UNIX 5.1A using DECs C and Fortran compilers and > perl 5.6.0. I found the above error in a file named > 'reg-tests-1.Rout.fail'. Any help you can give me would be most > appreciated.
Well, it seems to be an accuracy issue, so the first question would be what the values on both sides of the equality are (just start up R and enter the expressions on te command line). You might have 1) Completely wrong results in complex arithmetic 2) Slightly less than optimal accuracy 3) An underestimated .Machine$double.eps Case 2) seems most likely, but case 3) has been observed with buggy compilers that optimize calculations where they shouldn't. -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
