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NAME
    head - create a list of specified size from the head of a list

SYNOPSIS
    head(x, y)

TYPES
    x		list
    y		int

    return	list

DESCRIPTION
    If 0 <= y <= size(x), head(x,y) returns a list of size y whose
    elements in succession have values x[[0]]. x[[1]], ..., x[[y - 1]].

    If y > size(x), head(x,y) is a copy of x.

    If -size(x) < y < 0, head(x,y) returns a list of size (size(x) + y)
    whose elements in succession have values x[[0]]. x[[1]], ...,
    i.e. a copy of x from which the last -y members have been deleted.

    If y <= -size(x), head(x,y) returns a list with no members.

    For any integer y, x == join(head(x,y), tail(x,-y)).

EXAMPLE
    ; A = list(2, 3, 5, 7, 11)
    ; head(A, 2)

    list (2 members, 2 nonzero):
	  [[0]] = 2
	  [[1]] = 3

    ; head(A, -2)

    list (3 members, 3 nonzero):
	  [[0]] = 2
	  [[1]] = 3
	  [[2]] = 5

LIMITS
    none

LINK LIBRARY
    none

SEE ALSO
    tail, segment

## 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.
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: head,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/head,v $
##
## Under source code control:	1995/07/10 02:09:30
## 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/