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Annotation of loncom/html/adm/help/tex/Custom_Response_Problem_Creation.tex, revision 1.1

1.1     ! lira        1: \label{Custom_Response_Problem_Creation}
        !             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: 
        !             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:
        !             9: \begin{itemize}
        !            10: \item EXACT\_ANS: return if solved exactly correctly
        !            11: \item APPROX\_ANS: return if solved approximately
        !            12: \item INCORRECT: return if not correct, uses up a try
        !            13: \item ASSIGNED\_SCORE: partial credit (also return the credit factor, e.g. return(ASSIGNED\_SCORE,0.3);)
        !            14: \item SIG\_FAIL, NO\_UNIT, EXTRA\_ANSWER, MISSING\_ANSWER, BAD\_FORMULA, 
        !            15: WANTED\_NUMERIC, WRONG\_FORMAT: return if not correct for different reasons, does not use up a try
        !            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
        !            25: if ($submission=~/\,/) { return 'EXTRA_ANSWER'; }
        !            26: # Need a numerical answer here
        !            27: if ($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}
        !            36: 
        !            37: 
        !            38: Full list of possible return codes:
        !            39: \begin{itemize}
        !            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
        !            48: \item UNIT\_NOTNEEDED: submitted a unit when one shouldn't
        !            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
        !            54: \item WRONG\_FORMAT: student submission did not have the expected format
        !            55: \item INCORRECT: answer was wrong
        !            56: \item SUBMITTED: submission wasn't graded
        !            57: \item DRAFT: submission only stored
        !            58: \item MISORDERED\_RANK: student submitted a poorly order rank response
        !            59: \item ERROR: unable to get a grade
        !            60: \item ASSIGNED\_SCORE: partial credit; the customresponse needs to return the award followed by the partial credit factor  
        !            61: \item TOO\_LONG: answer submission was deemed too long
        !            62: \item INVALID\_FILETYPE: student tried to upload a file that was of an extension that was not specifically allowed 
        !            63: \item COMMA\_FAIL: answer requires the use of comma grouping and it wasn't provided or was incorrect
        !            64: \end{itemize}