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1.1     ! bowersj2    1: 
        !             2: With variables, you can store strings or numbers. \textbf{Functions} allow
        !             3: you to manipulate these strings or numbers. Functions work like mathematical
        !             4: functions: They take some number of arguments in, and return one argument,
        !             5: usually a number or a string for our purposes. There are a lot of functions
        !             6: available in LON-CAPA. You can see a complete list at http://mileva.lite.msu.edu/loncapadocs/homework/homework5.html.
        !             7: For now, let's just look at some simple examples.
        !             8: 
        !             9: %
        !            10: \begin{figure}
        !            11: \begin{lyxcode}
        !            12: \$a~=~-3.0;
        !            13: 
        !            14: \$b~=~\&sin(\$a);
        !            15: 
        !            16: \$c~=~\&pow(3.0,~\&abs(\$a));
        !            17: \end{lyxcode}
        !            18: 
        !            19: \caption{Some Function Calls\label{Some Function Calls Figure}}
        !            20: \end{figure}
        !            21: In the \textbf{Script} block, function names start with \textbf{\&}. Some
        !            22: example function calls are shown in figure \ref{Some Function Calls Figure}.
        !            23: You can see that functions can take either variables, numbers, or the results
        !            24: of other function calls as parameters. The \texttt{\&sin} function returns
        !            25: the sine of an angle expressed in radians. \texttt{\&pow} raises the first
        !            26: parameter to the power of the second parameter. \texttt{\&abs} returns the
        !            27: absolute value of the argument.