Annotation of loncom/html/adm/help/tex/Custom_Response_Problems.tex, revision 1.1
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:
! 5: The student answer is stored in the
! 6: variable \$submission, and needs to be evaluated by Perl code inside the <answer>-tag. Custom Response needs to return a standard LON-CAPA grading code:
! 7: \begin{itemize}
! 8: \item EXACT\_ANS: return if solved exactly correctly
! 9: \item APPROX\_ANS: return if solved approximately
! 10: \item INCORRECT: return if not correct, loose try
! 11: \item SIG\_FAIL, NO\_UNIT, ANS\_CNT\_NOT\_MATCH, BAD\_FORMULA,
! 12: WANTED\_NUMERIC: return if not correct for different reasons, do not loose try
! 13: \end{itemize}
! 14: The answer display is shown instead of the student response in 'show answer' mode.
! 15: The following example illustrates this:
! 16: \begin{verbatim}
! 17: <problem>
! 18: <startouttext />Accept an answer of around 90 or -90<endouttext />
! 19: <customresponse answerdisplay="something near 90 or -90">
! 20: <answer type="loncapa/perl">
! 21: # We do not want a vector
! 22: if ($submission=~/\,/) { return 'ANS_CNT_NOT_MATCH'; }
! 23: # Need a numerical answer here
! 24: if ($submission!~/^[\d\.\-\e]+$/i) { return 'WANTED_NUMERIC'; }
! 25: $difference=abs(90-abs($submission));
! 26: if ($difference==0) { return 'EXACT_ANS'; }
! 27: if ($difference < 0.1) { return 'APPROX_ANS'; }
! 28: return 'INCORRECT';</answer>
! 29: <textline readonly="no" />
! 30: </customresponse>
! 31: </problem>
! 32: \end{verbatim}
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