WeightedGrader
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Matching Problems That Have Static Graphic Images
This code shows how to assign different weights (percentages) to each answer in a problem.
| PG problem file | Explanation |
|---|---|
DOCUMENT(); loadMacros( "PGstandard.pl", "PGcourse.pl", "MathObjects.pl", "weightedGrader.pl", ); install_weighted_grader(); TEXT(beginproblem); |
Initialization: We need to include the |
Context("Numeric");
Context()->variables->add(t=>"Real");
Context()->strings->add(A=>{},B=>{});
$r = random(2,4,1);
$answer1 = Real("pi * $r**2");
$answer2 = Formula("x^2 * t");
$answer3 = String("A");
|
Set-up: To show how this works with MathObjects, we add some variables and strings to the context. |
Context()->texStrings;
BEGIN_TEXT
Enter \( \pi $r^2 \): \{ans_rule(10)\}
Enter \( x^2 t \): \{ans_rule(10)\}
Enter A: \{ans_rule(10)\}
END_TEXT
Context()->normalStrings;
|
Main Text: Answer boxes are as usual. |
$showPartialCorrectAnswers = 0; WEIGHTED_ANS( ($answer1)->cmp(), 40 ); WEIGHTED_ANS( ($answer2)->cmp(), 40 ); WEIGHTED_ANS( ($answer2)->cmp(), 20 ); ENDDOCUMENT(); |
Answer Evaluation: Use WEIGHTED_ANS( evaluator, weight) instead of ANS( evaluator ). The code given assigns 40% to each of the first two answers, and 20% to the last answer. The weights should be positive integers that sum to 100. |
