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Reply-To: "Nasser Abbasi" <nma@12000.org>
From: "Nasser Abbasi" <nma@12000.org>
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Subject: Re: Checking for Undefined [was Re: Ada vs Fortran for scientific
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"Bob Lidral" <l1dralspamba1t@comcast.net> wrote in message 
news:4475DA0F.5030603@comcast.net...
> Gordon Sande wrote:
>

> That's one of the features I miss about the old CDC CYBER architectures. 
> Their (one's complement, sigh) numeric format supported plus or minus 
> infinity (e.g., divide a non-zero number by zero) and plus or minus 
> indefinite (e.g., divide zero by zero, infinity by infinity, or use an 
> "indefinite" value anywhere in a divide operation).

hi,

fyi, Matlab supports NAN's, and it has Inf and -Inf (infinities)

>> a=1/0;
Warning: Divide by zero.
>> a
a =
   Inf

>> a-Inf
ans =
   NaN

>> 1-Inf
ans =
  -Inf

Mathematica also:

In[12]:=  1./0;
(warning displayed like in Matlab)

Out[13]= ComplexInfinity


Nasser