[R] error in Fields TPS function

ripley@stats.ox.ac.uk ripley at stats.ox.ac.uk
Wed Oct 30 15:06:35 CET 2002

On Wed, 30 Oct 2002, Simon Wood wrote:

> This may be a irrelevant, but I had some problems using svd() after R
> started allowing optimizations that use floating point registers for
> temporary variable storage (because these registers are usually longer than
> a standard double then some convergence testing tricks can get fooled by
> allowing this). Using la.svd() instead of svd() solved the problem.

Yes, svd uses LINPACK, and LIN/EISPACK were written long before such
chips existed.  It's a good reason to move away from them.

R has always allowed it on Linux (and such problems have been noted
there). What is new-ish is that R under Windows is now built to make use
of extended-fpu registers (it always use the registers, previously with
53-bit not 64-bit mantissa).

Brian D. Ripley,                  ripley at 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

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