Difference between revisions of "AnyAnswerMarkedCorrect"

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(Created page with '<h2>Any Answer Marked Correct</h2> <!-- Header for these sections -- no modification needed --> <p style="background-color:#eeeeee;border:black solid 1px;padding:3px;"> <em>…')
 
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<p style="background-color:#eeeeee;border:black solid 1px;padding:3px;">
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<em>This PG code shows how to mark any answer a student submits as correct.</em>
 +
<em>This PG code shows how to mark any answer a student submits as correct.
  +
There are, as usual, many ways to do this; we show two here, one using a
  +
[[CustomAnswerCheckers|custom answer checker]], and one using a special
  +
answer checker that marks any answer correct.</em>
 
</p>
  
</p>
   
 
<p style="text-align:center;">
  
<p style="text-align:center;">
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[[IndexOfProblemTechniques|Problem Techniques Index]]
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[[Problem_Techniques|Problem Techniques Index]]
 
</p>
  
</p>
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  +
<strong>With the Special Answer Checker</strong>
   
 
<table cellspacing="0" cellpadding="2" border="0">
  
<table cellspacing="0" cellpadding="2" border="0">
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</table>
  
</table>
   
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<strong>With a Custom Checker</strong>
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  +
<table cellspacing="0" cellpadding="2" border="0">
  +
  +
<tr valign="top">
  +
<th> PG problem file </th>
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<th> Explanation </th>
  +
</tr>
  +
  +
<!-- Load specialized macro files section -->
  +
  +
<tr valign="top">
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<td style="background-color:#ddffdd;border:black 1px dashed;">
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<pre>
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DOCUMENT();
  +
loadMacros(
  +
"PGstandard.pl",
  +
"MathObjects.pl",
  +
);
  +
TEXT(beginproblem());
  +
</pre>
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</td>
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<td style="background-color:#ccffcc;padding:7px;">
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<p>
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<b>Initialization:</b>
  +
No additions are needed to the initialization section of the file.
  +
</p>
  +
</td>
  +
</tr>
  +
  +
<!-- Setup section -->
  +
  +
<tr valign="top">
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<td style="background-color:#ffffdd;border:black 1px dashed;">
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<pre>
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Context("Numeric");
  +
  +
$a = Compute(random(2,9,1));
  +
  +
</pre>
  +
</td>
  +
<td style="background-color:#ffffcc;padding:7px;">
  +
<p>
  +
<b>Setup:</b>
  +
Everything is as usual. In this case we are going to need a MathObject to do the answer checking, so create one here.
  +
</p>
  +
</td>
  +
</tr>
  +
  +
<!-- Question text section -->
  +
  +
<tr valign="top">
  +
<td style="background-color:#ffdddd;border:black 1px dashed;">
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<pre>
  +
Context()->texStrings;
  +
BEGIN_TEXT
  +
Enter any number, e.g. \($a\) and it will be marked correct:
  +
\{ans_rule(10) \}.
  +
  +
  +
END_TEXT
  +
Context()->normalStrings;
  +
  +
</pre>
  +
<td style="background-color:#ffcccc;padding:7px;">
  +
<p>
  +
<b>Main Text:</b>
  +
The text section is as we'd expect.
  +
</p>
  +
</td>
  +
</tr>
  +
  +
<!-- Answer section -->
  +
  +
<tr valign="top">
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<td style="background-color:#eeddff;border:black 1px dashed;">
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<pre>
  +
$showPartialCorrectAnswers = 1;
  +
  +
ANS( $a-&gt;cmp( checker=&gt;sub {
  +
my ( $cor, $stu, $ans ) = @_;
  +
return 1; } ) );
  +
  +
ENDDOCUMENT();
  +
</pre>
  +
<td style="background-color:#eeccff;padding:7px;">
  +
<p>
  +
<b>Answer Evaluation:</b>
  +
We use our MathObject to check the answer, but specify a [[CustomAnswerCheckers|custom answer checker]] to do the actual checking. Here we return 1 for any answer, so anything will be marked correct. One note about this method: because our MathObject is a real number, it will require that the student's answer be a real number to be marked correct. We could accept any formula or number by specifying <code>$a = Formula(random(2,9,1))</code> above.
  +
</p>
  +
<p>
  +
<i>It should also be possible to turn off type checking---we need to document this.</i>
  +
</p>
  +
</td>
  +
</tr>
  +
</table>
 
<p style="text-align:center;">
  
<p style="text-align:center;">
 
[[IndexOfProblemTechniques|Problem Techniques Index]]
  
[[IndexOfProblemTechniques|Problem Techniques Index]]
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[[Category:Problem Techniques]]
  
[[Category:Problem Techniques]]
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Revision as of 14:00, 21 June 2013

Any Answer Marked Correct


This PG code shows how to mark any answer a student submits as correct. There are, as usual, many ways to do this; we show two here, one using a custom answer checker, and one using a special answer checker that marks any answer correct.

Problem Techniques Index

With the Special Answer Checker

PG problem file Explanation 
DOCUMENT();
loadMacros(
"PGstandard.pl",
"MathObjects.pl",
"PGasu.pl",
"PGcourse.pl",
);
TEXT(beginproblem());

Initialization: We need to include the macros file PGasu.pl, which provides an answer checker that marks any answer submitted as correct. 

Context("Numeric");
Context()->variables->are(x=>"Real",y=>"Real",u=>"Real");

$a = random(2,9,1);

Setup: Everything is as usual. 

Context()->texStrings;
BEGIN_TEXT
Enter anything, e.g. \($a\) and it will be marked correct:
\{ans_rule(10) \}.


END_TEXT
Context()->normalStrings;

Main Text: The text section is as we'd expect. 

$showPartialCorrectAnswers = 1;

ANS(auto_right("All answers are marked correct"));

ENDDOCUMENT();

Answer Evaluation: We use the ANS(auto_right("All answers are marked correct")); routine to evaluate the answer. The phrase in quotes (which can be empty) is displayed when "Show correct answers" is checked. See PGasu.pl.html for more options and details.

With a Custom Checker

PG problem file Explanation 
DOCUMENT();
loadMacros(
"PGstandard.pl",
"MathObjects.pl",
);
TEXT(beginproblem());

Initialization: No additions are needed to the initialization section of the file. 

Context("Numeric");

$a = Compute(random(2,9,1));

Setup: Everything is as usual. In this case we are going to need a MathObject to do the answer checking, so create one here. 

Context()->texStrings;
BEGIN_TEXT
Enter any number, e.g. \($a\) and it will be marked correct:
\{ans_rule(10) \}.


END_TEXT
Context()->normalStrings;

Main Text: The text section is as we'd expect. 

$showPartialCorrectAnswers = 1;

ANS( $a->cmp( checker=>sub {
    my ( $cor, $stu, $ans ) = @_;
    return 1; } ) );

ENDDOCUMENT();

Answer Evaluation: We use our MathObject to check the answer, but specify a custom answer checker to do the actual checking. Here we return 1 for any answer, so anything will be marked correct. One note about this method: because our MathObject is a real number, it will require that the student's answer be a real number to be marked correct. We could accept any formula or number by specifying $a = Formula(random(2,9,1)) above.

It should also be possible to turn off type checking---we need to document this.

Problem Techniques Index


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