[Haskell] Literal for Infinity

Tomasz Zielonka tomasz.zielonka at gmail.com
Thu Sep 29 08:08:35 EDT 2005

On 9/29/05, Yitzchak Gale <gale at sefer.org> wrote:
> While checking for floating-point overflow and
> underflow conditions, I tried to create a somewhat
> reliable cross-platform Infinity with the literal
> "1e100000".
> When GHC 6.4.1 reads this literal, it goes into a
> deep trance and consumes huge amounts of
> memory. Shouldn't it immediately recognize such a
> thing as Infinity?

I think it is equivalent to (fromRational 1e100000), and (1e100000 ::
can take a substantial amount of space.

Is there a better way to check for Infinity? I
> have not yet figured out how to check for NaN at
> all - because it is not equal to itself. Any
> suggestions?

Did you try isNaN and isInfinite? I don't have much experience with these
functions myself.

Best regards
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