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    1: \label{Calling_Functions}
    2: 
    3: With variables, you can store strings or numbers. \textbf{Functions} allow
    4: you to manipulate these strings or numbers. Functions work like mathematical
    5: functions: They take some number of arguments in, and return one argument,
    6: usually a number or a string for our purposes. There are a lot of functions
    7: available in LON-CAPA. You can see a complete list at
    8: \ref{all functions table}.
    9: 
   10: For now, let's just look at some simple examples.
   11: 
   12: %
   13: \begin{figure}
   14: \begin{lyxcode}
   15: \$a~=~-3.0;
   16: 
   17: \$b~=~\&sin(\$a);
   18: 
   19: \$c~=~\&pow(3.0,~\&abs(\$a));
   20: \end{lyxcode}
   21: 
   22: \caption{Some Function Calls\label{Some Function Calls Figure}}
   23: \end{figure}
   24: In the \textbf{Script} block, function names start with \textbf{\&}. Some
   25: example function calls are shown in figure \ref{Some Function Calls Figure}.
   26: You can see that functions can take either variables, numbers, or the results
   27: of other function calls as parameters. The \texttt{\&sin} function returns
   28: the sine of an angle expressed in radians. \texttt{\&pow} raises the first
   29: parameter to the power of the second parameter. \texttt{\&abs} returns the
   30: absolute value of the argument.