Thorsten Froehlich wrote:
> 
> No, it cannot efficiently without needless penalty for all platforms.  The
> error is in the Visual C library because (even the ancient 1989 version of)
> the C standard specifies pow to return NaN* in this case and to (optionally)
> issue an exception/signal.  Unfortunately the Visual C library apparently
> fails to do either :-(

All right, then i would suggest adding something like the following to the
pow() documentation (section 6.1.3.6):

"pow(A,B) Exponentiation. Returns the value of A raised to the power B.
Alternatively the hat operator can be used A^B.  For negative A and
non-integer B the function has no defined return value, the result then
may depend on the platform POV-Ray is compiled on."


Christoph

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