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*To*: plt-scheme@fast.cs.utah.edu*Subject*: Re: dumb DrScheme rational # question*From*: Richard Cobbe <cobbe@airmail.net>*Date*: Tue, 29 Jan 2002 18:29:30 -0600 (CST)*In-Reply-To*: <20020129233337.68099206F6@sualocin.ccs.neu.edu>*References*: <Pine.SGI.4.33.0201291046370.27459769-100000@buphy.bu.edu><E16Vad7-0006ZO-00@hawk.prod.itd.earthlink.net><15447.12549.562001.848502@ankh-morpork.cobbe.net><20020129233337.68099206F6@sualocin.ccs.neu.edu>*Sender*: owner-plt-scheme@fast.cs.utah.edu

Lo, on Tuesday, January 29, Matthias Felleisen did write: > > The key is to teach the trade-off. Including the computational trade-off. Oh, indeed. In hindsight, my statement wasn't perhaps the clearest---we simply showed them how to use exact->inexact to translate the final answer into a form that was easier to understand, rather than forcing all of the numeric computations to use FP math (as Robby had suggested). Regrettably, I don't entirely remember the context in which this came up, so I can't say whether or not we addressed the tradeoffs between rational and FP math. I suspect not; I recall being somewhat surprised at the 60-odd digit rational result from a particular exercise, so I just threw exact->inexact up on the board. Ah, well; something to do better next time. Richard

**Follow-Ups**:**Can't get to download page***From:*"Greg Pettyjohn" <pgreg14@qwest.net>

**Re: dumb DrScheme rational # question***From:*Robert Bruce Findler <robby@cs.rice.edu>

**References**:**dumb DrScheme rational # question***From:*Brian Gregor <bgregor@BUPHY.bu.edu>

**Re: dumb DrScheme rational # question***From:*Robert Bruce Findler <robby@cs.rice.edu>

**Re: dumb DrScheme rational # question***From:*Richard Cobbe <cobbe@airmail.net>

**Re: dumb DrScheme rational # question***From:*Matthias Felleisen <matthias@ccs.neu.edu>

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