[R] Problems raised to 1/3 power and NaN
tlumley at u.washington.edu
Wed Apr 28 01:47:17 CEST 2004
On Tue, 27 Apr 2004, Bock, Michael wrote:
> I though you could take the cubed root of negative numbers (basic
> algebra) but perhaps this does not hold true for computer math due to
> rounding of the exponents.
Yes. All the representable floating point numbers are fractions whose
denominator is a power of two, and so none of them give exactly
real-valued roots of negative numbers.
You could use complex numbers, but then you have the problem of getting
the correct cube root.
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