Annotation of loncom/html/adm/help/tex/Calling_Functions.tex, revision 1.5
1.2 bowersj2 1: \label{Calling_Functions}
1.1 bowersj2 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
1.3 www 7: available in LON-CAPA. You can see a complete list at
1.4 albertel 8: \ref{all_functions_table}.
1.3 www 9:
1.1 bowersj2 10: For now, let's just look at some simple examples.
11:
12: %
13: \begin{figure}
14: \$a~=~-3.0;
15:
16: \$b~=~\&sin(\$a);
17:
18: \$c~=~\&pow(3.0,~\&abs(\$a));
19:
20: \caption{Some Function Calls\label{Some Function Calls Figure}}
21: \end{figure}
22: In the \textbf{Script} block, function names start with \textbf{\&}. Some
1.5 ! raeburn 23: example function calls are shown above.
1.1 bowersj2 24: You can see that functions can take either variables, numbers, or the results
25: of other function calls as parameters. The \texttt{\&sin} function returns
26: the sine of an angle expressed in radians. \texttt{\&pow} raises the first
27: parameter to the power of the second parameter. \texttt{\&abs} returns the
28: absolute value of the argument.
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