A DataGraph can be scripted to display many functions.  Use the following methods to change the display:

• Use addFunction(String str)  to add another functions to a graph.  This method will return an integer id that can be used to access the functions properties.
• Use changeFunctionString(int id, String str)  to change a function that is already being plotted.
• Use deleteAllFunctions()  to remove all functions from the plot.
• Use deleteFunction(int id)  to remove the function with a given id from the plot.
• Use setRGB(int id, int r, int g, int b)  to change the color of a function.

Caution:  If you add the same function more than once, you will only see one function since the second function will be drawn on top of the first function.

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