From help-octave-request at bevo dot che dot wisc dot edu  Fri Jan  8 04:33:09 1999
Subject: Re: Existence of a variable
From: Akira Nishimura <akira at rsch dot tuis dot ac dot jp>
To: ted at ffa dot se
Cc: help-octave at bevo dot che dot wisc dot edu
Date: Fri, 08 Jan 1999 19:33:01 +0900

From: Daniel Tourde <ted at ffa dot se>
Subject: Existence of a variable
Date: Fri, 08 Jan 1999 10:54:43 +0100

>I'm using a function defined like this
>
>function F = f(a,b)
>  ...
>  if (b)
>    ...
>  endif
>endfunction
>
>I want to call the function f with one or two parameters (A = f(a) or B
>= f(a,b))
>Then I have a problem because in the first case b is not defined and
>Octave complains. I tried to use the built-in function 'exist'

Another solution without `exist'; try with `nargin' variable.

exist_b = 1;
if nargin < 2
  exist_b = 0;
endif

if exist_b
  ...

--
         Akira NISHIMURA  akira at rsch dot tuis dot ac dot jp
           Department of Information Systems
Faculty of Business Administration and Information Science
        Tokyo University of Information Sciences