argn — Returns the number of input/output arguments in a function call
[lhs [,rhs] ]=argn() lhs=argn(1) rhs=argn(2)
This function is used inside a function definition.
It gives the number of actual inputs arguments (rhs
)
and output arguments (lhs
) passed to the function when the function is
called. It is usually used in function definitions to deal with
optional arguments.