--- loncom/html/adm/help/tex/Spreadsheet_Functions.tex	2002/07/22 21:08:18	1.1
+++ loncom/html/adm/help/tex/Spreadsheet_Functions.tex	2003/10/14 16:03:51	1.7
@@ -1,36 +1,70 @@
-The following functions are available in the spreadsheet:
+\label{Spreadsheet_Functions}
+The following special functions are available in the spreadsheet.
+Please see \textbf{Referencing Cells} (\ref{Spreadsheet_Referencing_Cells})
+for information on specifying cells and ranges.
 
 \begin{itemize}
 
 \item \texttt{\&NUM(range)} - number of non-empty cells in range
+\index{NUM}
 
 \item \texttt{\&BIN(low, high, range)} - number of non-empty cells in
   range with values between low and high
+\index{BIN}
 
 \item \texttt{\&SUM(range)} - sum of the non-empty cells in range
+\index{SUM}
 
 \item \texttt{\&MEAN(range)} - mean value of non-empty cells in range
+\index{MEAN}
 
 \item \texttt{\&STDDEV(range)} - standard deviation of non-empty cells
   in range 
+\index{STDDEV}
 
 \item \texttt{\&PROD(range)} - product of non-empty cells in range
+\index{PROD}
 
 \item \texttt{\&MAX(range)} - maximum value of non-empty cell in range
+\index{MAX}
 
 \item \texttt{\&MIN(range)} - minimum value of non-empty cells in
   range 
+\index{MIN}
 
 \item \texttt{\&SUMMAX(n ,range)} - sum of the maximum n non-empty
   cells in range
+\index{SUMMAX}
 
 \item \texttt{\&SUMMIN(n, range)} - sum of the minimum n non-empty
   cells in range
+\index{SUMMIN}
 
-\item \texttt{\&EXT(expression)} - access to EXT function in lonnet
+\item \texttt{\&EXT(expression)} - access to EXT function in lonnet.
+Use \&EXT(``system.time'') to retrieve the current time.
+\index{EXT}
+
+\item \texttt{\&SUMSEQ(column,sequence1,sequence2,sequence3,...)} -
+sum the given column across the folders or sequences listed.  
+
+When specifying a sequence use the full title.  Instead of a sequence title
+the word ``all'' can be used to sum over all sequences.  Regular expressions
+can be entered as well, if prefixed by ``regexp:''.  See below for examples.
+
+\begin{itemize}
+
+\item \texttt{\&SUMSEQ(``Z'',''Chapter 1'');}
+
+\item \texttt{\&SUMSEQ(``Z'',''Chapter 1'',''Chapter 2'',''Chapter 3'');}
+
+\item \texttt{\&SUMSEQ(``Z'',''all'');} - sum over all sequences.
+
+\item \texttt{\&SUMSEQ(``Z'',''regexp:Large Biomolecules'');} -
+ sum over all sequences which match the regular expression 
+/Large Biomolecules/.
+
+\end{itemize}
 
 \end{itemize}
 
-In addition, non-IO Perl functions work in cells, which is internally
-evaluated within a safe space. Field names and Column-Row combinations
-can be used as variables.
\ No newline at end of file
+In addition, most non-IO Perl functions work in cells.