Annotation of loncom/html/adm/help/tex/Custom_Response_Problems.tex, revision 1.5
1.1 www 1: \label{Custom_Response_Problems}
2: Custom Response is a way to have a problem graded based on an algorithm. The use of this response type is
3: generally discouraged, since the responses will not be analyzable by the LON-CAPA statistics tools.
4:
1.5 ! www 5: For a single textfield, the student's answer will be in a variable \$submission. If the Custom Response has multiple textfields, the answers will be in an array
! 6: reference, and can be accessed as \$\$submission[0], \$\$submission[1], etc.
! 7:
! 8: The student answer needs to be evaluated by Perl code inside the <answer>-tag. Custom Response needs to return a standard LON-CAPA. The most common response are:
1.1 www 9: \begin{itemize}
10: \item EXACT\_ANS: return if solved exactly correctly
11: \item APPROX\_ANS: return if solved approximately
1.2 albertel 12: \item INCORRECT: return if not correct, uses up a try
1.5 ! www 13: \item ASSIGNED\_SCORE: partial credit (also return the credit factor, e.g. return(ASSIGNED\_SCORE,0.3);)
1.3 albertel 14: \item SIG\_FAIL, NO\_UNIT, EXTRA\_ANSWER, MISSING\_ANSWER, BAD\_FORMULA,
1.2 albertel 15: WANTED\_NUMERIC: return if not correct for different reasons, does not use up a try
1.1 www 16: \end{itemize}
17: The answer display is shown instead of the student response in 'show answer' mode.
18: The following example illustrates this:
19: \begin{verbatim}
20: <problem>
21: <startouttext />Accept an answer of around 90 or -90<endouttext />
22: <customresponse answerdisplay="something near 90 or -90">
23: <answer type="loncapa/perl">
24: # We do not want a vector
1.3 albertel 25: if ($submission=~/\,/) { return 'EXTRA_ANSWER'; }
1.1 www 26: # Need a numerical answer here
27: if ($submission!~/^[\d\.\-\e]+$/i) { return 'WANTED_NUMERIC'; }
28: $difference=abs(90-abs($submission));
29: if ($difference==0) { return 'EXACT_ANS'; }
30: if ($difference < 0.1) { return 'APPROX_ANS'; }
31: return 'INCORRECT';</answer>
32: <textline readonly="no" />
33: </customresponse>
34: </problem>
35: \end{verbatim}
1.3 albertel 36:
37:
38: Full list of possible return codes:
39: \begin{itemize}
1.4 albertel 40: \item EXACT\_ANS: student is exactly correct
41: \item APPROX\_ANS: student is approximately correct
42: \item NO\_RESPONSE: student submitted no response
43: \item MISSING\_ANSWER: student submitted some but not all parts of a response
44: \item EXTRA\_ANSWER: student submitted a vector of values when a scalar was expected
45: \item WANTED\_NUMERIC: expected a numeric answer and didn't get one
46: \item SIG\_FAIL: incorrect number of Significant Figures
47: \item UNIT\_FAIL: incorrect unit
1.5 ! www 48: \item UNIT\_NOTNEEDED: submitted a unit when one shouldn't
1.4 albertel 49: \item UNIT\_INVALID\_INSTRUCTOR: the unit provided by the author of the problem is unparsable
50: \item UNIT\_INVALID\_STUDENT: the unit provided by the student is unparasable
51: \item UNIT\_IRRECONCIBLE: the unit from the student and the instructor are of different types
52: \item NO\_UNIT: needed a unit but none was submitted
53: \item BAD\_FORMULA: syntax error in submitted formula
1.3 albertel 54: \item INCORRECT: answer was wrong
55: \item SUBMITTED: submission wasn't graded
56: \item DRAFT: submission only stored
1.4 albertel 57: \item MISORDERED\_RANK: student submitted a poorly order rank response
1.3 albertel 58: \item ERROR: unable to get a grade
1.5 ! www 59: \item ASSIGNED\_SCORE: partial credit; the customresponse needs to return the award followed by the partial credit factor
! 60: \item TOO\_LONG: answer submission was deemed too long
1.4 albertel 61: \item INVALID\_FILETYPE: student tried to upload a file that was of an extension that was not specifically allowed
62: \item COMMA\_FAIL: answer requires the use of comma grouping and it wasn't provided or was incorrect
1.5 ! www 63: \end{itemize}
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