The contract for '~r' deliberately excludes +nan.0, +inf.0, etc---that's
why it's 'rational?' and not 'real?'. The point of '~r' is to provide
numeric formatting options, none of which apply to +nan.0, etc.
Ryan
On 03/04/2013 01:26 PM, Ray Racine wrote:
Currently the `~r' format routine, which accepts rationals, barfs on
+nan.0 and siblings, which are not rationals. My current use case is
simply displaying sub-ranges of vectors of flonums. It is not a problem
to check for +nan.0 and explicitly display it. I was just wanted to toss
it out as a don't know what is the "right thing" for the `~r' format
routine to do here.
> (define: x : Flonum +nan.0)
> (define: y : Flonum 3.145962)
> (~r y)
- : String
"3.145962"
> (~r x)
~r: contract violation
expected: rational?
given: +nan.0
...
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