* John W. Eaton <j...@bevo.che.wisc.edu> [2009-06-11 11:27]:
> So first, can you determine precisely where Octave is actually
> hannging? Does the following program work, or does it also hang in
> the same way?
>
> #include <cmath>
> #include <complex>
> #include <iostream>
>
> typedef std::complex<double> Complex;
>
> Complex
> xlog2 (const Complex& x)
> {
> #if defined (M_LN2)
> static double ln2 = M_LN2;
> #else
> static double ln2 = log (2);
> #endif
>
> return std::log (x) / ln2;
> }
>
> int
> main (void)
> {
> std::complex<double> inf_i (0.0, 1.0/0.0);
> std::cerr << inf_i << std::endl;
> std::complex<double> result = xlog2 (inf_i);
> std::cerr << result << std::endl;
> return 0;
> }
>
> I expect this program to print:
>
> (0,inf)
> (inf,2.26618)
>
> but if it hangs, then I think the problem is in the C++ or C library
> functions, not Octave.
No, it does not hang, but produces the following:
(0,inf)
(nan,nan)
On my Debian sid chroot on amd64, it produces:
(0,inf)
(inf,nan)
--
Rafael
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