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Some folks might think: “you still use RCS”?!? And we will say, hey, at least we switched from SCCS to RCS back in … I think it was around 1994 ... at least we are keeping up! :-) :-) :-) Logs say that SCCS version 18 became RCS version 19 on 1994 March 18. RCS served us well. But now it is time to move on. And so we are switching to git. Calc releases produce a lot of file changes. In the 125 releases of calc since 1996, when I started managing calc releases, there have been 15473 file mods!
78 lines
2.3 KiB
Plaintext
78 lines
2.3 KiB
Plaintext
NAME
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modify - modify a list or matrix by changing the values of its elements
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SYNOPSIS
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modify(A, fname)
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TYPES
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A lvalue with list, matrix or objectvalue
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fname string, the name of a user-defined function
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return null value if successful, otherwise an error value
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DESCRIPTION
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The value of each element of A is replaced by the value at that
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value of the user-defined function with name fname. Thus,
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modify(A, "f") has the effect of
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for (i = 0; i < size(A); i++) A[[i]] = f(A[[i]]);
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An error value is returned if A is not of acceptable type, if A has
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no-change protection, or if there is no user-defined function with
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name fname. The assignments are executed even if the protection
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status of some elements A[[i]] would normally prevent the
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assignment of f(A[[i]]) to A[[i]]. The modified elements retain
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whatever kinds of protection they had as well as gaining any
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other kinds of protection in the values returned by the function.
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To obtain a modified copy of A without changing values in A,
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one may use
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Amod = A; modify(A, fname)
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or more simply
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modify(Amod = A, fname).
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EXAMPLE
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; define f(x) = x^2
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; A = list(2,4,6)
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; modify(A, "f")
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; print A
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list (3 elements, 3 nonzero):
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[[0]] = 4
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[[1]] = 16
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[[3]] = 36
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LIMITS
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none
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LINK LIBRARY
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none
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SEE ALSO
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makelist
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## Copyright (C) 1999 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 1995/07/10 02:09:31
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## File existed as early as: 1995
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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