R-beta: exponentiation

[Ross Ihaka]

    Jim> Values in the range 1e-30^1e12 to 1e-30^1e17 hang R0.61.2 under
    Jim> Red Hat 5. (fed by nlm to a function). This is rather difficult to
    Jim> debug when ctrl-C does not work!  Jim

I have no problems under FreeBSD 2.2.5 which uses the portable Sun
IEEE 754 library.  Is that available under Linux?

Does anyone have fix for the ^C problem.  Again, it's not a problem
on any of my platforms ...

	Ros
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