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The function's catalog is a collection of built-in and ([IFunctionCatalog|http://aida.freehep.org/doc/v3.2.1/api/hep/aida/IFunctionCatalog.html
]) is to be used to register user defined functions that have been registered with itso that they can be easily created or cloned through the IFunctionFactory.

Registering User Defined Functions

After defining a function, eigher by scripting or coding it, it is possible to register it with the function's catalog by simply adding it specifying a name that will be used when creating it via the IFunctionFactory.
In the following example a function is registered with the catalog and used by name when creating a new function (the sum of a gaussian with the newly registered function):

// The AIDA Factories
IAnalysisFactory af = IAnalysisFactory.create();
ITree = af.createTreeFactory().create();
IFunctionFactory ff = af.createFunctionFactory(tree);

// Register the function myFunc with the catalog.
// Note that there are many ways in which myFunc could have been created.
ff.catalog().add("myFunc",myFunc);

IFunction func = ff.createFunctionByName("func","g+myFunc");

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