* How to format exact rationals?
@ 2010-05-21 12:45 Sascha Ziemann
2010-05-21 17:35 ` Andy Wingo
0 siblings, 1 reply; 2+ messages in thread
From: Sascha Ziemann @ 2010-05-21 12:45 UTC (permalink / raw)
To: guile-user
Is this the intended behavior for exact rationals?
guile> (format #f "~f" (/ 1 3))
FORMAT: error with call: (format #f "~f<===" ===>1/3 )
illegal character `/' in number->string
If so how to format them?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How to format exact rationals?
2010-05-21 12:45 How to format exact rationals? Sascha Ziemann
@ 2010-05-21 17:35 ` Andy Wingo
0 siblings, 0 replies; 2+ messages in thread
From: Andy Wingo @ 2010-05-21 17:35 UTC (permalink / raw)
To: Sascha Ziemann; +Cc: guile-user
Hi,
On Fri 21 May 2010 14:45, Sascha Ziemann <ceving@googlemail.com> writes:
> Is this the intended behavior for exact rationals?
>
> guile> (format #f "~f" (/ 1 3))
>
> FORMAT: error with call: (format #f "~f<===" ===>1/3 )
> illegal character `/' in number->string
I don't know. There is some pretty gnarly code there; for some reason it
takes the argument, does number->string on it, parses the resulting
string, and there it's failing because it doesn't seem to handle exact
rationals.
But, as rationals are real numbers, just as the exact integers, we
should expect this function to format (/ 1 3) appropriately.
> If so how to format them?
As a workaround, use `(format #f "~f" (exact->inexact (1/3)))'. I'll
commit a real fix to master sometime soon.
Andy
--
http://wingolog.org/
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