FreeMat: NARGOUT Number of Output Arguments

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NARGOUT Number of Output Arguments

Section: Functions and Scripts

# Usage

The `nargout` function computes the number of return values requested from a function when it was called. The general syntax for its use

       y = nargout

FreeMat allows for fewer return values to be requested from a function than were declared, and `nargout` can be used to determine exactly what subset of the functions outputs are required.

You can also use `nargout` on a function handle to return the number of input arguments expected by the function

      y = nargout(fun)

where `fun` is the name of the function (e.g. `'sin'`) or a function handle.

# Example

Here is a function that is declared to return five values, and that simply prints the value of `nargout` each time it is called.

         nargouttest.m

    function [a1,a2,a3,a4,a5] = nargouttest
      printf('nargout = %d\n',nargout);
      a1 = 1; a2 = 2; a3 = 3; a4 = 4; a5 = 5;

    --> a1 = nargouttest
    nargout = 1

    a1 =
     1

    --> [a1,a2] = nargouttest
    nargout = 2
    a1 =
     1

    a2 =
     2

    --> [a1,a2,a3] = nargouttest
    nargout = 3
    a1 =
     1

    a2 =
     2

    a3 =
     3

    --> [a1,a2,a3,a4,a5] = nargouttest
    nargout = 5
    a1 =
     1

    a2 =
     2

    a3 =
     3

    a4 =
     4

    a5 =
     5

    --> nargout('sin')

    ans =
     1

    --> y = @sin

    y =
     @sin
    --> nargout(y)

    ans =
     1