R help - Aug 2002 - base conversion, digit interweaving

I've written some "rough" functions for base conversion and digit
interweaving
(as in x=135, y=246, interwoven=123456) which are ok for a small number
of
conversions or weaves, but, to be able to handle a large number of
conversions
or weaves, I'm hoping that some faster code already exists (ideally
calling C
or FORTRAN).  Any suggestions for going base10 to base2, base2 to base4,
or
digit interweaving would be appreciated.

regards,
Richard Remington

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