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New spreadsheet help files.

\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
\index{EXT}

\end{itemize}

In addition, most non-IO Perl functions work in cells.