I'm using .Call() to call C code from R under Windows (on an Intel
Core 2 duo). The C code involves some very small numbers, and I think
I'm losing precision using doubles. I thought I might use long doubles
to see if I can get that precision back. I have a few questions:
1. Does this affect the portability to other OSs or processors?
2. I'm returning the results in a matrix. Will a matrix of REALs be
sufficient for holding long doubles, or will it be cast back to doubles?
3. Will calls to FORTRAN BLAS (like dsymv, dpotrf, dpotri) still work
with long doubles?
Thanks for any help you can provide.
--
Richard D. Morey
Assistant Professor
Psychometrics and Statistics
Rijksuniversiteit Groningen / University of Groningen
http://drsmorey.org/research/rdmorey
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