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Mathematica > Core Language > Rules & Patterns > Patterns > Default >

BUILT-IN MATHEMATICA SYMBOL

Default

Default[f]
gives the default value for arguments of the function f obtained with a

pattern object.

gives the default value to use when

appears as the i

argument of f.

gives the default value for the i

argument out of a total of n arguments.

Default[f, ...]=val
defines default values for arguments of f.

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.

Define 0 to be the default argument for a function

represents an argument that can be omitted:

If the second argument is omitted, the default value of 0 is used instead:

If both arguments are omitted, both are taken to have the default value 0:

Define 0 to be the default argument for a function

Out[1]=

represents an argument that can be omitted:

Out[2]=

If the second argument is omitted, the default value of 0 is used instead:

Out[3]=

If both arguments are omitted, both are taken to have the default value 0:

Out[4]=