Return to Spreadsheet_Calculation.tex CVS log

Up to [LON-CAPA] / loncom / html / adm / help / tex

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

1.1     ! matthew     1: \label{Spreadsheet_Completely_Recalc}
        !             2: The total number of sheets in course can be tremendous, since it is
        !             3: the number of students times the number of assessments. LON-CAPA
        !             4: caches these sheets and only selectively invalidates those cache
        !             5: copies if potentially relevant data changes. \textbf{Completely
        !             6: Recalc} forces LON-CAPA to invalidate all cache copies.
        !             7: \index{Completely Recalc}
        !             8: 
        !             9: For instance, this is necessary to get the most up-to-date
        !            10: calculations if the sheet itself contains direct access to the system
        !            11: clock (making it ``out-of-date'' the moment it is calculated), or if
        !            12: an assessment is edited in a way that would retroactively change
        !            13: grading. The automatic spreadsheet devalidation catches student
        !            14: submissions, \textbf{PAR}a\textbf{M}eter changes, and spreadsheet
        !            15: changes, but not re-publication of a problem resource.  \label{Spreadsheet_Max_Depth_Exceeded}
        !            16: The ``Maximum Calculation Depth Exceeded''\index{Maximum Calculation
        !            17: Depth Exceeded error} error can occur when you reference other cells in
        !            18: calculations. For example, if you have: 
        !            19: 
        !            20: \texttt{G0 = Some\_complicated\_expression\\
        !            21:  X0 = G0>2?1:0}
        !            22: 
        !            23: Try replacing \texttt{X0}'s contents with \texttt{[
        !            24: (Some\_complicated\_expression) > 2]?1:0}. In other words, replace the
        !            25: reference to \texttt{G0} with the actual contents of \texttt{G0}. That
        !            26: might fix your error by removing one level of indirection that
        !            27: LON-CAPA must process in order to compute the result.