From bug-request at octave dot org Mon Feb  7 09:10:48 2005
Subject: Re: Inconsistency in complex division by zero
From: Gabriele Pannocchia <g dot pannocchia at cpclab dot ing dot unipi dot it>
To: Andy Adler <adler at site dot uottawa dot ca>
Cc: bug at octave dot org
Date: Mon, 07 Feb 2005 15:07:40 +0000

Hi

Matlab 7.0sp1 returns to me:
>> 1i/0
Warning: Divide by zero.

ans =3D

      NaN +    Infi

i.e. with a "+" for the imaginary part.

Since 1/0 returns (either in octave and matlab)
>> 1/0
Warning: Divide by zero.

ans =3D

   Inf

I think the correct answer should be :
ans =3D NaN + Infi

Cheers,
	Gabriele

>=20
> > There is an inconsistency in the division by zero between octave =20
> and
> > matlab. Consider 1i/0 that returns "NaN - NaNi" for octave and "NaN
> > -Infi" for matlab. The Matlab return value makes much more sense
> that
> > the octave one as it treats the real and imaginary parts
> separately..
> > Tested against octave 2.1.64 and matlab 7.0sp1.
>=20
> Matlab 6.5 gives:
> >> 1i/0
> Warning: Divide by zero.
> ans =3D
>       NaN +    Infi
>=20
> Which should it be?
>=20
> --
> Andy Adler <adler at site dot uOttawa dot ca> 1(613)562-5800x6218
>=20
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