On 11-09-07 6:25 PM, Mike Miller wrote:
I'm getting the impression from on-line docs that R cannot work with
single-precision floating-point numbers, but that it has a pseudo-mode for
single precision for communication with external programs.
I don't mind that R is using doubles internally, but what about storage?
If all I need to store is single-precision (32-bit), can I do that? When
it is read back into R it can be converted from single to double (back to
64-bit).
Furthermore, the data are numbers from 0.000 to 2.000 with no missing
values that could be stored just as accurately as unsigned 16-bit integers
from 0 to 2000. That would be the best plan for me.
writeBin is quite flexible in converting between formats if you just
want to store them on disk. To use nonstandard formats in memory will
require external support; it's not easy.
Duncan Murdoch
It looks like the ff package allows for additional formats, so I might try
to use ff, but I still would like to get a better understanding of R's
native capabilities in regard to representations of numbers both in RAM
and in stored data files.
Thanks in advance.
Best,
Mike
--
Michael B. Miller, Ph.D.
Minnesota Center for Twin and Family Research
Department of Psychology
University of Minnesota
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