[R] Signs of loadings from princomp on Windows

Peter Dalgaard p.dalgaard at biostat.ku.dk
Thu Sep 16 08:53:11 CEST 2004

Tony Plate <tplate at blackmesacapital.com> writes:

> difference?"  (The fact that various people chimed in to say they
> could reproduce the behavior that bothered you, but didn't bother dig
> deeper suggests it didn't bother them that much, which further
> suggests that you are the person most motivated by this and thus the
> best candidate for investigating it further...)

It could be well worth finding though. It's most likely a reliance on
uninitialized memory (the only other explanation I can think of is if
something is tampering with the FPU control word). That may be mostly
harmless if the algorithm converges - the sign is not well defined
anyway - but we have recently fixed a couple of bugs where the
occasional injection of NaN or Inf values caused real trouble.

   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

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