[racket] Am I Missing Something? [HtDP 31.3.1]

I can explain it, but I don't know if it's revealing a solution.

rac

On Jan 4, 2011, at 12:32 PM, Stephen Chang wrote:

> I get results similar to Carl.
> 
> Welcome to DrRacket, version 5.0.1.7 [3m].
> Language: Intermediate Student.
> #i-0.49746596003269394
> #i-0.4974659600326953
> #i-4974659600326939.0
> #i-4974659600326953.0
>> (equal? (sum (g-series #i1000)) (accu-sum (g-series #i1000)))
> false
>> (equal? (* 10e15 (sum (g-series #i1000))) (* 10e15 (accu-sum (g-series #i1000))))
> false
>> 
> 
> 
> Luke, can you post the output you get?
> 
> 
> 
> 
> On Tue, Jan 4, 2011 at 10:57 AM, Carl Eastlund <cce at ccs.neu.edu> wrote:
>> 
>> On Tue, Jan 4, 2011 at 9:38 AM, Luke Jordan <luke.jordan at gmail.com> wrote:
>>> All that code came straight out of the text, except that I used if instead
>>> of cond.  The sum, accu-sum, and g-series defs are all given.  In your
>> 
>> Ah, yes, now I see where the accumulator-based sum is.  Sorry, my mistake.
>> 
>>> results I see a difference.  When I run it at home it's the same.  I can
>>> even (equal? (sum (listof number)) (accu-sum (listof number))) and get true.
>> 
>> No idea what's going on.  Maybe someone else will have an idea.
>> 
>> --Carl
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