Thanks; I'm on 32-bit linux, but it's good to know the behavior on Windows. Do you know a way to force "floor" to use this reduced precision?
Ben Duncan Murdoch wrote: > On Windows, it's fairly common for runtime libraries to switch the > precision from 80 bit to 64 bit. R on Windows tries to guard against > this, and on your test package, I get > > when f computed by R, C says 40 by itself > when f computed by R, C says 40, Fortran says 40 > when f computed by C, C says 40 by itself > when f computed by C, C says 40, Fortran says 40 > > It's possible that the floating point change is happening on your > platform, or happened before you even got to this call. > > Here's code that works in Windows to detect such a change across a > LoadLibrary call: > > rcw = _controlfp(0,0) & ~_MCW_IC; /* Infinity control is ignored */ > _clearfp(); > tdlh = LoadLibrary(path); > dllcw = _controlfp(0,0) & ~_MCW_IC; > > No idea if _controlfp() exists on your system. > > Duncan Murdoch ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
