Re: [racket-users] handin-server: reader used in checker modules

[Jordan Johnson]

> On Oct 17, 2018, at 11:30, Shu-Hung You  > wrote:
>> 
>> Would it help if in the check module you use `=' as the equality test,
>> or specify #e10.25 instead?
> 
> Success!
> 
> Specifying
> (!test (hour-angle 12 20 30) #e10.25)
> produces the behavior I expected, correctly comparing the numbers.

Ehh, I spoke too soon. The analagous student test —
(check-expect (hour-angle 12 20 30) 10.25)
— fails when included in the handin submission.

My working hypothesis is that I just need to configure the handin server’s 
evaluator to have (read-decimal-as-inexact #f). I’m trying to work out how to 
do that from the (check: ...) form, and failing that, will manually create & 
configure the evaluator.

If you can tell me how to do that — or tell me if I’m wrong — I’d much 
appreciate the saved time. But I do expect it’s a problem I can solve on my own 
with enough time.

Thanks,
Jordan


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Re: [racket-users] handin-server: reader used in checker modules

[Jordan Johnson]

On Oct 17, 2018, at 11:30, Shu-Hung You  
wrote:
> 
> Would it help if in the check module you use `=' as the equality test,
> or specify #e10.25 instead?

Success!

Specifying
(!test (hour-angle 12 20 30) #e10.25)
produces the behavior I expected, correctly comparing the numbers.

Thanks, all!

Best,
Jordan

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Re: [racket-users] handin-server: reader used in checker modules

[Jordan Johnson]

>> So, what aspect of the language config would be responsible for 41/4 not 
>> equaling 10.25?
> 
> Welcome to Racket v7.0.0.20.
>> (= 41/4 10.25)
> #t
>> (read-decimal-as-inexact #f)
>> (= 41/4 10.25)
> #t
> 
> Do you perhaps print and read the result? 

Nope. The code that’s generating the error is

(check: :language 'lang/htdp-intermediate
...
(!test (hour-angle 12 20 30) 10.25)
...)

I’m looking into !test now; I don’t yet know how it does its comparison.

jmj

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Re: [racket-users] handin-server: reader used in checker modules

[Shu-Hung You]

On Wed, Oct 17, 2018 at 1:12 PM Jordan Johnson  wrote:
>
>
> On Oct 17, 2018, at 10:35, Matthias Felleisen  wrote:
>
> (check-expect (+ 10 .25) 10.25)
>
> errors with check-expect’s message about not comparing inexact numbers, but 
> in DrRacket+BSL the decimals are treated as exact numbers.
>
> What do I need to change in the checker, in order to obtain the same numeric 
> behavior as in DrRacket?
>
> Set read-decimal-as-inexact might solve the problem.
>
>
> Progress! But not completely solved. By adding
>
> (read-decimal-as-inexact #f)
>
> to the checker module, I now don’t get the check-expect error. Instead, I’m 
> seeing
>
> submit error: your code failed a test: (hour-angle 12 20 30) evaluated to 
> 41/4, expecting 10.25
>
>
> produced by the checker line
>
> (!test (hour-angle 12 20 30) 10.25)
>

Would it help if in the check module you use `=' as the equality test,
or specify #e10.25 instead?

> where hour-angle computes exactly.
>
> So, what aspect of the language config would be responsible for 41/4 not 
> equaling 10.25?
>
> Best,
> Jordan
>
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Re: [racket-users] handin-server: reader used in checker modules

[Matthias Felleisen]

> On Oct 17, 2018, at 2:11 PM, Jordan Johnson  wrote:
> 
> 
>> On Oct 17, 2018, at 10:35, Matthias Felleisen  wrote:
>>> (check-expect (+ 10 .25) 10.25)
>>> 
>>> errors with check-expect’s message about not comparing inexact numbers, but 
>>> in DrRacket+BSL the decimals are treated as exact numbers.
>>> 
>>> What do I need to change in the checker, in order to obtain the same 
>>> numeric behavior as in DrRacket?
>> Set read-decimal-as-inexact might solve the problem. 
> 
> Progress! But not completely solved. By adding 
> (read-decimal-as-inexact #f)
> to the checker module, I now don’t get the check-expect error. Instead, I’m 
> seeing
> submit error: your code failed a test: (hour-angle 12 20 30) evaluated to 
> 41/4, expecting 10.25
> 
> produced by the checker line
> (!test (hour-angle 12 20 30) 10.25)
> where hour-angle computes exactly.
> 
> So, what aspect of the language config would be responsible for 41/4 not 
> equaling 10.25?


Hmph: 
 
Welcome to Racket v7.0.0.20.
> (= 41/4 10.25)
#t
> (read-decimal-as-inexact #f)
> (= 41/4 10.25)
#t


Do you perhaps print and read the result? 

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Re: [racket-users] handin-server: reader used in checker modules

[Jordan Johnson]

> On Oct 17, 2018, at 10:35, Matthias Felleisen  wrote:
>>  (check-expect (+ 10 .25) 10.25)
>> 
>> errors with check-expect’s message about not comparing inexact numbers, but 
>> in DrRacket+BSL the decimals are treated as exact numbers.
>> 
>> What do I need to change in the checker, in order to obtain the same numeric 
>> behavior as in DrRacket?
> Set read-decimal-as-inexact might solve the problem. 

Progress! But not completely solved. By adding 
(read-decimal-as-inexact #f)
to the checker module, I now don’t get the check-expect error. Instead, I’m 
seeing
submit error: your code failed a test: (hour-angle 12 20 30) evaluated to 41/4, 
expecting 10.25

produced by the checker line
(!test (hour-angle 12 20 30) 10.25)
where hour-angle computes exactly.

So, what aspect of the language config would be responsible for 41/4 not 
equaling 10.25?

Best,
Jordan

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Re: [racket-users] handin-server: reader used in checker modules

[Matthias Felleisen]

> On Oct 17, 2018, at 1:21 PM, Jordan Johnson  wrote:
> 
> Hi all,
> 
> In my last thread regarding the handin server, Matthew suggested:
>> A workaround is to use `'lang/htdp-beginner` as the language instead of
>> `'(special beginner)`. That happens to avoid a redundant and
>> troublemaking `require`.
> 
> So, I’m using 'lang/htdp-beginner in an assignment’s checker.rkt file, and I 
> am seeing errors that appear to be the result of the handin server using a 
> different reader (or configuration thereof) than DrRacket does for BSL. 
> Specifically,
> 
>   (check-expect (+ 10 .25) 10.25)
> 
> errors with check-expect’s message about not comparing inexact numbers, but 
> in DrRacket+BSL the decimals are treated as exact numbers.
> 
> What do I need to change in the checker, in order to obtain the same numeric 
> behavior as in DrRacket?


Set read-decimal-as-inexact might solve the problem. 

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[racket-users] handin-server: reader used in checker modules

[Jordan Johnson]

Hi all,

In my last thread regarding the handin server, Matthew suggested:
> A workaround is to use `'lang/htdp-beginner` as the language instead of
> `'(special beginner)`. That happens to avoid a redundant and
> troublemaking `require`.

So, I’m using 'lang/htdp-beginner in an assignment’s checker.rkt file, and I am 
seeing errors that appear to be the result of the handin server using a 
different reader (or configuration thereof) than DrRacket does for BSL. 
Specifically,

(check-expect (+ 10 .25) 10.25)

errors with check-expect’s message about not comparing inexact numbers, but in 
DrRacket+BSL the decimals are treated as exact numbers.

What do I need to change in the checker, in order to obtain the same numeric 
behavior as in DrRacket?

Thanks,
Jordan

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