Name

argn — Returns the number of input/output arguments in a function call

Calling Sequence

[lhs [,rhs] ]=argn()
lhs=argn(1)
rhs=argn(2)

Description

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.

Examples

function concat=myOwnFunction(name,optional)
  [lhs,rhs]=argn(0) 
  if rhs <= 1 then
  	 optional="my Optional value"
  end
  if rhs == 0 then
  	 error("Expect at least one argument")
  end
  concat=name+" "+optional
endfunction
  

See Also

function , varargin