Re: sqrt function, NaN and complex number

[Dmitri A. Sergatskov]

John W. Eaton wrote:

> In any case, I don't think it is really a bug in Octave.
>
> What happens if you try a simple C++ program to test sqrt(NaN+NaN*i)?

That does seems to work OK:

address@hidden divzero]$ cat test4.cc
#include <complex>
#include <iostream>

int main()
{
  std::complex<double> z1(1.0/0.0,1.0/0.0);
  std::complex<double> z2 = std::sqrt(z1);
  std::complex<double> z3 = std::sqrt(z2);

  std::cout
        << "z1: " << z1 << std::endl
        << "z2: " << z2 << std::endl
        << "z3: " << z3 << std::endl;
  return 0;
}

address@hidden divzero]$ g++ -Wall -o test4 test4.cc
test4.cc: In function `int main()':
test4.cc:6: warning: division by zero in `1.0e+0 / 0.'
test4.cc:6: warning: division by zero in `1.0e+0 / 0.'
address@hidden divzero]$ ./test4
z1: (inf,inf)
z2: (nan,nan)
z3: (nan,nan)

Using gcc 3.4.2

> jwe

Dmitri.
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