Re: approximatino non trancedental numbers

[David Bateman]

Willem Hendriks wrote:
> What methods / algorithms does octave use when i type:
>
> 34.25^(0.3) for instance?
>
> does it create an polynomial and find it roots?
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>   
The code fragment doing this operation in Octave is

octave_value
xpow (double a, double b)
{
  if (a < 0.0 && static_cast<int> (b) != b)
    {
      Complex atmp (a);

      return std::pow (atmp, b);
    }
  else
    return std::pow (a, b);
}

There are similar functions for the 3 other cases real/complex,
complex/real and complex/complex for the arguments.. The the answer to
your question, is Octave uses whatever method/algorithm that is defined
by the libc++ for the std::pow method..

D.

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