2 isnull - whether a value is a null value
13 Determine if x is a null value. This function will return 1 if x is
14 a null value, 0 otherwise.
18 ; print isnull(a), isnull(1)
28 isassoc, isatty, isblk, isconfig, isdefined, iserror, iseven, isfile,
29 ishash, isident, isint, islist, ismat, ismult, isnum, isobj,
30 isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
31 issimple, issq, isstr, istype
33 ## Copyright (C) 1999 Landon Curt Noll
35 ## Calc is open software; you can redistribute it and/or modify it under
36 ## the terms of the version 2.1 of the GNU Lesser General Public License
37 ## as published by the Free Software Foundation.
39 ## Calc is distributed in the hope that it will be useful, but WITHOUT
40 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
41 ## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
42 ## Public License for more details.
44 ## A copy of version 2.1 of the GNU Lesser General Public License is
45 ## distributed with calc under the filename COPYING-LGPL. You should have
46 ## received a copy with calc; if not, write to Free Software Foundation, Inc.
47 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
49 ## @(#) $Revision: 30.1 $
50 ## @(#) $Id: isnull,v 30.1 2007/03/16 11:10:42 chongo Exp $
51 ## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/isnull,v $
53 ## Under source code control: 1994/10/21 02:21:28
54 ## File existed as early as: 1994
56 ## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
57 ## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/