?? modify
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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/
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