On 5-Aug-2003, Peter Dalgaard BSA <[EMAIL PROTECTED]> wrote: | Also, R is generally compiled with -D NO_MATH_INLINES because of some | ancient messup with glibc. I'm not sure whether that is actually still | necessary, but it is forcing the use of the non-inlined pow() function.
I think the origin of this option might be that someone reported a bug in Octave because exp (-Inf) was returning NaN. The problem turned out to be that the inline version of exp returns NaN for Inf, NaN, and -Inf arguments. These days it seems that you don't get the inline versions unless you use -ffast-math (at least that's what I just now found with gcc 3.3). Using -DNO_MATH_INLINES might still be needed for some older GCC compiler/library combinations, so I don't think it hurts. I'm not sure whether it matters for R, but according to the glibc math.h header the inline versions also don't set errno. jwe ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
