NAME    modify - modify a list or matrix by changing the values of its elementsSYNOPSIS    modify(A, fname)TYPES    A		lvalue with list, matrix or objectvalue    fname	string, the name of a user-defined function    return	null value if successful, otherwise an error valueDESCRIPTION    The value of each element of A is replaced by the value at that    value of the user-defined function with name fname. Thus,    modify(A, "f") has the effect of	for (i = 0; i < size(A); i++) A[[i]] = f(A[[i]]);    An error value is returned if A is not of acceptable type, if A has    no-change protection, or if there is no user-defined function with    name fname. The assignments are executed even if the protection    status of some elements A[[i]] would normally prevent the    assignment of f(A[[i]]) to A[[i]]. The modified elements retain    whatever kinds of protection they had as well as gaining any    other kinds of protection in the values returned by the function.    To obtain a modified copy of A without changing values in A,    one may use	Amod = A; modify(A, fname)    or more simply	modify(Amod = A, fname).EXAMPLE    ; define f(x) = x^2    ; A = list(2,4,6)    ; modify(A, "f")    ; print A    list (3 elements, 3 nonzero):	  [[0]] = 4	  [[1]] = 16	  [[3]] = 36LIMITS    noneLINK LIBRARY    noneSEE ALSO    makelist## Copyright (C) 1999  Landon Curt Noll#### Calc is open software; you can redistribute it and/or modify it under## the terms of the version 2.1 of the GNU Lesser General Public License## as published by the Free Software Foundation.#### Calc is distributed in the hope that it will be useful, but WITHOUT## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY## or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General## Public License for more details.#### A copy of version 2.1 of the GNU Lesser General Public License is## distributed with calc under the filename COPYING-LGPL.  You should have## received a copy with calc; if not, write to Free Software Foundation, Inc.## 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.#### @(#) $Revision: 29.4 $## @(#) $Id: modify,v 29.4 2006/05/19 15:12:57 chongo Exp $## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/modify,v $#### Under source code control:	1995/07/10 02:09:31## File existed as early as:	1995#### chongo <was here> /\oo/\	http://www.isthe.com/chongo/## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/