automatic Inf+NaN*i conversion

[Rolf Fabian]

I consider the automatic conversion of input 'Inf+NaN*i'
to 'NaN-NaN*i' as a bug because this may lead to strange
illogical consequences.

octave-3.0.0.exe:1> x = [Inf+NaN*i,NaN+Inf*i]
x =
   NaN - NaNi   NaN + Infi

( If you consider the 1st element result 'NaN-NaNi' as intended,
  can you please explain the meaning of the appearing minus sign? )

octave-3.0.0.exe:2> isnan(x)
ans =
   1   1     # agree

Checking x for finiteness :
octave-3.0.0.exe:3> finite (x)
ans =
   0   0     # agree

But the result of the following check contradicts
above result because 1st element of x cannot be
neither finite nor infinite !
octave-3.0.0.exe:4> isinf (x)
ans =
   0   1     # disagree with respect to 1st element

R:



-----
Rolf Fabian
<r dot fabian at jacobs-university dot de>

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