Default
 Usage
• Default[f], if defined, gives the default value for arguments of the function f obtained with a _. pattern object.
• Default[f, i] gives the default value to use when _. appears as the i argument of f.
• Default[f, i, n] gives the default value for the i argument out of a total of n arguments.
Notes
• _. represents an optional argument to a function, with a default value specified by Default. • The necessary values for Default[f] must always be defined before _. is used as an argument of f. • Values defined for Default[f] are stored in DefaultValues[f]. • New in Version 1.
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