Difference between revisions of "AnswerHints"
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− | Knowls (little bits of knowledge) provide an always present link to a hint that, when clicked on, expands to reveal the hint or, when clicked on again, retracts to hide the hint. The <code>value</code> of a knowl should be plain text |
+ | Knowls (little bits of knowledge) provide an always present link to a hint that, when clicked on, expands to reveal the hint or, when clicked on again, retracts to hide the hint. The <code>value</code> of a knowl should be plain text (math mode may cause problems, as it did for me using ww 2.9). It is possible to get math to display, but it requires using a few escape tricks: <code>value=>escapeSolutionHTML(EV3P('Substitute \\(3u\\) wherever you see \\(t\\) in the formula for \\(f\\).')), base64=>1)</code>. In particular, note the use of <code>escapeSolutionHTML(EV3P())</code> to do extra interpretation of the string formatting and also note the use of double backslashes <code>\\( \\)</code> for the math mode delimiters. No special macros are needed for Knowls. |
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Revision as of 14:59, 28 June 2014
Answer Hints
This PG code shows how to include three different kinds of answer hints:
- General answer hints that help students get started on a problem and are always available via "Knowls".
- General answer hints that help students get started on a problem and are made available after a student has submitted an answer at least once (a "Show hints" checkbox appears near the "Submit Answers" button) via a
BEGIN_HINT / END_HINT
block of text. - Specific, customized answer hints that appear in the answer feedback messages box after a student submits a particular answer that activates a pre-programmed hint via the
answerHints.pl
macro and a post-filter with answer hints for the answer checker.
You may also be interested in ErrorMessageCustomization
PG problem file | Explanation |
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DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "answerHints.pl", ); TEXT(beginproblem()); |
Initialization:
We need to include the macros file |
Context("Numeric"); Context()->variables->are(t=>"Real",u=>"Real"); $f = Formula("2 t"); $answer = Formula("6 u"); |
Setup:
We restrict the variables to |
Context()->texStrings; BEGIN_TEXT If \( f(t) = $f \), then \( f(3u) \) = \{ ans_rule(10) \} $BR $BR \{ knowlLink("Click for a hint", value=>'Substitute 3u wherever you see t in the formula for f.') \} END_TEXT $showHint = 5; BEGIN_TEXT $PAR If you don't get this in $showHint tries, you can get a hint. END_TEXT BEGIN_HINT Substitute \( 3u \) wherever you see \( t \) in the formula for \( f(t) = $f \). END_HINT Context()->normalStrings; |
Main Text:
Knowls (little bits of knowledge) provide an always present link to a hint that, when clicked on, expands to reveal the hint or, when clicked on again, retracts to hide the hint. The
For hints that are revealed to students only after a certain number of submissions, we set |
$showPartialCorrectAnswers = 1; ANS($answer->cmp()->withPostFilter(AnswerHints( Formula("6 t") => "Are you using the correct variable?", Formula("6 u") => "Good work!", ))); |
Answer Evaluation:
To generate specific, customized answer hints for particular answers, we use the If the same error message should be given for several different answers, you should make a square bracketed list of those answers. For example, if the variables x, t, and u were all in the context, we could use ANS($answer->cmp()->withPostFilter(AnswerHints( [Compute("6 t"),Compute("6 x")] => "Are you using the correct variable?", )));
If the MathObjects answer evaluator normally generates a message, the default is not to change a message that is already in place. To override a message generated by a MathObjects answer evaluator, you should set ANS($answer->cmp()->withPostFilter(AnswerHints( Compute("6 u") => ["Good work!",replaceMessage=>1], ))); |
- POD documentation: answerHints.pl.html
- PG macro code: answerHints.pl
- POD documentation: problemPanic.pl.html
- PG macro code: problemPanic.pl