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Default values / optional parameters


[Contact the author to obtain the notebook mentioned - moderator]

The sample notebook shows how two functions defined in a very similar 
manner behave differently when using optional parameters. Question: How 
can I define a function whose optional parameter is a pattern requiring 
a specific head and has a given default value? Help says this is x_h:v 
but my example says that this does not work in some cases.

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