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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!
82 lines
2.4 KiB
Plaintext
82 lines
2.4 KiB
Plaintext
NAME
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sum - sum, or sum of defined sums
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SYNOPSIS
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sum(x_1, x_2, ...)
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TYPES
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x_1, x_2, ... any
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return any
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DESCRIPTION
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If an argument x_i is a list with elements e_1, e_2, ..., e_n, it
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is treated as if x_i were replaced by e_1, e_2, ..., e_n; this may
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continue recurively if any of the e_j is a list.
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If an argument x_i is an object of type xx, then x_i is replaced by
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xx_sum(x_i) if the function xx_sum() has been defined. If the
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type xx has been defined by:
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obj xx = {x, y, z},
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an appropriate definition of xx_sum(a) is sometimes a.x + a.y + a.z.
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sum(a) then returns the sum of the elements of a.
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If x_i has the null value, it is ignored. Thus, sum(a, , b, , c)
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will return the same as sum(a, b, c).
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Assuming the above replacements, and that the x_1, x_2, ..., are
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of types for which addition is defined, sum(x_1, x_2, ...) returns
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the sum of the arguments.
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EXAMPLE
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; print sum(2), sum(5, 3, 7, 2, 9), sum(3.2, -0.5, 8.7, -1.2, 2.5)
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2 26 12.7
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; print sum(list(3,5), 7, list(6, list(7,8), 2))
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38
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; obj point {x, y}
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; define point_add(a,b) = obj point = {a.x + b.x, a.y + b.y}
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; obj point A = {1, 5}
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; obj point B = {1, 4}
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; obj point C = {3, 3}
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; print sum(A, B, C)
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obj point {5, 12}
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; define point_sum(a) = a.x
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; print sum(A, B, C)
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5
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LIMITS
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The number of arguments is not to exceed 1024.
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LINK LIBRARY
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SEE ALSO
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max, min, obj, ssq
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## Copyright (C) 1999-2006 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: 1997/03/10 03:59:59
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## File existed as early as: 1997
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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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