[LON-CAPA-users] How to write a custom response problem with vector I/O?
Itay
itayf at nospammail.net
Wed Oct 28 10:46:24 EDT 2020
Justin
Thank you for the help.
I will try to examine further the customresponse option.
Perhaps another expert will offer an answer.
Cheers,
Itay
On Tue, 27 Oct 2020, at 20:54, Justin Gray wrote:
> This was in reply to your R example. I have just read your most recent message. I am not sure how to provide more detailed feedback on the answer input without using customresponse. My approach is usually to just provide clear instructions to students on what is expected.
>
> Best,
> Justin
> --
> *Justin Gray*
> Senior Lecturer | Department of Mathematics
> Simon Fraser University | SCK 10531
> 8888 University Dr., Burnaby, B.C. V5A 1S6
> Canada
> Simon Fraser University is located on the Unceded Coast Salish Territories of the xʷməθkʷəy̓əm (Musqueam), Səl̓ílwətaʔ/Selilwitulh (Tsleil-Waututh), Kwikwitlem, and Skwxwú7mesh Úxwumixw (Squamish) Peoples
>
>
> On Tue, Oct 27, 2020 at 11:49 AM Justin Gray <jgray at math.sfu.ca> wrote:
>> Perhaps you could do something with this:
>>
>> <problem>
>> <script type="loncapa/perl">$ax=&random(1.0,10,0.1);
>> $ay=&random(1.0,10,0.1);
>> @args = ($ax, $ay);
>> $answer = "Many answers are possible";
>> </script>
>> <startouttext />
>> <p>Consider a vector <m eval="on">\( \vec{a} = $ax\hat{x} + $ay\hat{y} \)</m>'.
>> Provide a vector <m>\( \vec{b} \)</m>, orthogonal to <m>\( \vec{a} \)</m>.
>> </p>
>> Enter the coordinates of <m>\( \vec{b} \)</m> separated by a comma. That is, answer in the form <font color="red"> <m>\( b_x, b_y \)</m></font>:
>> <endouttext />
>> <mathresponse cas="maxima" answerdisplay="$answer" args="@args">
>> <answer>is(abs([LONCAPALIST[1],LONCAPALIST[2]].[RESPONSE[1],RESPONSE[2]]) < 0.001);</answer>
>> <textline readonly="no" spellcheck="none" />
>> </mathresponse>
>> </problem>
>>
>> Best,
>> Justin
>>
>> --
>> *Justin Gray*
>> Senior Lecturer | Department of Mathematics
>> Simon Fraser University | SCK 10531
>> 8888 University Dr., Burnaby, B.C. V5A 1S6
>> Canada
>> Simon Fraser University is located on the Unceded Coast Salish Territories of the xʷməθkʷəy̓əm (Musqueam), Səl̓ílwətaʔ/Selilwitulh (Tsleil-Waututh), Kwikwitlem, and Skwxwú7mesh Úxwumixw (Squamish) Peoples
>>
>>
>> On Sat, Oct 24, 2020 at 4:15 AM Itay <itayf at nospammail.net> wrote:
>>> __
>>> Hi
>>>
>>> (Sorry for miswriting Justin's name in my previous message.)
>>> I finally was able to get a working minimal example (see below).
>>>
>>> This modest success bring up a few follow-up questions that I hope that list members could answer.
>>> 1. How to test responder's input, e.g., for non-numeric submission?
>>> Should I use the $submission variable with the initial <script> block?
>>> 2. If the test should be done inside R : how to deliver the test results to LC?
>>>
>>> I ask this because when I tested the ME below with various inputs that do not follow the expected format (non-numeric values, missing input, etc.) I got only one kind of warning 'Unable to understand formula'.
>>>
>>> I would like to be able to give a more granular feedback to the students, in the spirit of the original ME.
>>>
>>> Thanks
>>> Itay
>>>
>>> <problem>
>>> <script type="loncapa/perl">
>>> $ax = &random(1.0, 10, 0.1); # Coordinates of \vec{a}
>>> $ay = &random(1.0, 10, 0.1);
>>> @avec = ($ax, $ay);
>>> $answer="Chose b such that the scalar product with a is zero.";
>>> </script>
>>>
>>> <startouttext />
>>> Consider a vector <m eval="on">\( \vec{a} = $ax\hat{x} + $ay\hat{y} \)</m>'.
>>> Provide a vector <m>\( \vec{b} \)</m>, orthogonal to <m>\( \vec{a} \)</m>.
>>> <br />
>>> <endouttext />
>>>
>>> <mathresponse answerdisplay="$answer" cas="R" args="@avec">
>>> <answer>
>>> a <- c(LONCAPALIST[1],LONCAPALIST[2]);
>>> b <- c(RESPONSE[1],RESPONSE[2]) ;
>>> abs(sum(a*b))<0.001
>>> </answer>
>>> <textline readonly="no" size="20" />
>>> </mathresponse>
>>> </problem>
>>>
>>>
>>>
>>>
>>> On Sat, 24 Oct 2020, at 13:35, Itay wrote:
>>>> Just,
>>>> Thank you for your reply.
>>>> Following your suggestion I tried to create a minimal example based on the template
>>>> Math Response using Computer Algebra System R
>>>> Here, too, I am having difficulties.
>>>> The minimal example is enclosed below.
>>>> Typing the correct answer for vector b (ay, -ax)
>>>> provokes the response
>>>> Unable to understand formula.
>>>>
>>>> Note : the command delegated to R was tested directly with R.
>>>>
>>>> Thank you
>>>> Itay
>>>>
>>>>
>>>> <problem>
>>>>
>>>> <script type="loncapa/perl">
>>>> $ax = &random(1.0, 10, 0.1); # Coordinates of \vec{a}
>>>> $ay = &random(1.0, 10, 0.1);
>>>> @avec = ($ax, $ay);
>>>> $answer="Chose b such that the scalar product with a is zero.";
>>>> </script>
>>>>
>>>>
>>>> <startouttext />
>>>> Consider a vector <m eval="on">\( \vec{a} = $ax\hat{x} + $ay\hat{y} \)</m>'.
>>>> Provide a vector <m>\( \vec{b} \)</m>, orthogonal to <m>\( \vec{a} \)</m>.
>>>> <br />
>>>> <endouttext />
>>>>
>>>> <mathresponse answerdisplay="$answer" cas="R" args="@avec">
>>>> <answer>
>>>> abs(sum(LONCAPALIST * RESPONSE))<0.001
>>>> </answer>
>>>> <textline readonly="no" size="20" />
>>>> </mathresponse>
>>>>
>>>> </problem>
>>>>
>>>>
>>>>
>>>>
>>>> On Fri, 23 Oct 2020, at 23:36, Justin Gray wrote:
>>>>> I'm afraid I do not have an answer to your question, but have you considered coding this problem as a mathresponse problem?
>>>>>
>>>>> Best regards,
>>>>> Justin
>>>>> --
>>>>>
>>>>> *Justin Gray*
>>>>> Senior Lecturer | Department of Mathematics
>>>>> Simon Fraser University | SCK 10531
>>>>> 8888 University Dr., Burnaby, B.C. V5A 1S6
>>>>> Canada
>>>>>
>>>>> Simon Fraser University is located on the Unceded Coast Salish Territories of the xʷməθkʷəy̓əm (Musqueam), Səl̓ílwətaʔ/Selilwitulh (Tsleil-Waututh), Kwikwitlem, and Skwxwú7mesh Úxwumixw (Squamish) Peoples
>>>>>
>>>>>
>>>>> On Fri, Oct 23, 2020 at 1:18 PM Itay <itayf at nospammail.net> wrote:
>>>>>> __
>>>>>> Hi
>>>>>>
>>>>>> I am trying to develop a custom response problem in which the student submission is a vector.
>>>>>> A minimal example is provided below.
>>>>>> Regardless of what I typed in the either of the two input fields I get the response:
>>>>>> 'This question expects a numeric answer.'
>>>>>>
>>>>>> Please advise what am I doing wrong?
>>>>>>
>>>>>> Thanks in advance.
>>>>>> Itay
>>>>>>
>>>>>>
>>>>>> <problem> <!-- begin minimal -->
>>>>>> <script type="loncapa/perl">
>>>>>> $ax = &random(1.0, 10, 0.1); # Coordinates of \vec{a}
>>>>>> $ay = &random(1.0, 10, 0.1);
>>>>>> </script>
>>>>>>
>>>>>> <startouttext />
>>>>>> Consider a vector <m eval="on">\( \vec{a} = $ax\hat{x} + $ay\hat{y} \)</m>'.
>>>>>> Provide a vector <m>\( \vec{b} \)</m>, orthogonal to <m>\( \vec{a} \)</m>.
>>>>>> <br />
>>>>>> <endouttext />
>>>>>>
>>>>>> <customresponse id="dotProd">
>>>>>> <answer type="loncapa/perl">
>>>>>> for ($i=0; $i<2; $i++) { # Test input sanity.
>>>>>> if ($submission[i] =~ /^\d+\s+\w+$/) { return 'UNIT_NOTNEEDED'; }
>>>>>> if ($submission[i] !~ /^[\d\.]+$/) { return 'WANTED_NUMERIC'; }
>>>>>> }
>>>>>>
>>>>>> # Is submission correct?
>>>>>> $dotProd = $ax * $submission[0] + $ay * $submission[1];
>>>>>> if (abs($dotProd) < 1.0e-3) { return 'APPROX_ANS'; } # Can't expect EXACT_ANS.
>>>>>> return 'INCORRECT';
>>>>>> </answer>
>>>>>>
>>>>>> <startouttext /><m>\( b_x = \)</m><endouttext />
>>>>>> <textline size="10" readonly="no" spellcheck="none" />
>>>>>> <startouttext /><br /><endouttext />
>>>>>>
>>>>>> <startouttext /><m>\( b_y = \)</m><endouttext />
>>>>>> <textline size="10" readonly="no" spellcheck="none" />
>>>>>> <startouttext /><br /><endouttext />
>>>>>> </customresponse>
>>>>>> </problem> <!-- end minimal -->
>>>>>>
>>>>>>
>>>>> _______________________________________________
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>>>>>
>>>>
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>>>>
>>>
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