NAME    search - search for an element satisfying a specified conditionSYNOPSIS    search(a, b [, [c] [, [d] ] ])TYPES    a		matrix, list, association or file    b		string if a is a file, otherwise any    c		integer, defaults to zero or current file-position    d		integer, defaults to size(a) or current file-position    return	nonnegative integer or null valueDESCRIPTION    Negative values of c and nonpositive values for d are treated as    offsets from size(a), i.e. as if c were replaced by size(a) + c,    and d by size(a) + d.  Any such adjustment is assumed in the following    description.    For Non-file a:    For a matrix, list, or association a,    search(a, b, c, d) returns, if it exists, the least index i for which    c <= i < d,	 0 <= i < size(a), and, if accept() has not been defined,    a[[i]] == b, or if accept() has been defined, accept(a[[i]], b)    tests as nonzero.  The null value is returned if there is no such i.    For example, to search for the first a[[i]] > b an appropriate    accept() function is given by:		define accept(v,b) = (v > b);    To restore the original behavior of search(), one may then use		define accept(v, b) = (v == b).    Since the addresses (rather than values) of a and b are passed,    the values of v = x[[i]] and b may be changed during execution    of search(a, b, c, d), e.g. if accept(v,b) has been defined by		define accept(v,b) = (v > b ? v-- : b++);    For a is a file-stream:    c defaults to the current file-position if there are just two    arguments (a,b) or if there are four arguments as in (a,b, ,d)    where d is an integer.  Otherwise c defaults to zero.    d defaults to the current file-position or size(a) according as    the number of arguments (indicated by commas) is four or less    than four.    If a is a file, a string formed by n successive characters in a    is considered to occur at the file position    of the first character.  E.g. if a has the characters "123456",    the string "345" is said to occur at position 2.    The file is searched forwards from file-position pos = c for    a match with b (not including the terminating '\0').    Only characters with file-positions less than d are considered,    so the effective interval for the first-character position pos    for a matching string is limited by both c <= pos <= d - strlen(b)    and 0 <= pos < size(a) - strlen(b).    The function returns pos if a match is found, and the reading position    for the stream after the search will then correspond to the position of    the terminating '\0' for the string b.    The null value is returned if no match is found.  If c, d, size(a)    and strlen(b) are such that no match is possible, no reading of the    file occurs and the current file-position is not changed.  In a case    where characters are read, the final file-position will be    min(d, size(a)) - strlen(b) + 1,    i.e. the file will be at the first position where a match is impossible    because the specified search region has insufficient remaining characters.EXAMPLE    ; L = list(2,"three",4i)    ; search(L,"three")	    1    ; search(L,"threes")    ; search(L, 4i, 4)    ; search(L, 4i, 1)	    2    ; f = fopen("foo", "w+")    ; fputs(f, "This file has 28 characters.")    ; rewind(f)    ; search(f, "ha")	10    ; ftell(f)	12    ; search(f, "ha")	18    ; search(f, "ha")    ; search(f, "ha",)	10    ; search(f, "ha", 12)	18    ; search(f, "ha", -10)	18    ; search(f, "ha", ,)	10    ; search(f, "ha", 11, 19)    ; ftell(f)	18    ; search(f, "ha", 11, 20)	18    ; search(f, "ha", 5, 500)	10LIMITS    noneLINK LIBRARY    noneSEE ALSO     append, delete, insert, islist, pop, push, remove, rsearch,     select, size,     assoc, list, mat## Copyright (C) 1999-2006  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: search,v 29.4 2006/06/25 22:16:55 chongo Exp $## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/search,v $#### Under source code control:	1994/03/19 03:13:21## File existed as early as:	1994#### chongo <was here> /\oo/\	http://www.isthe.com/chongo/## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/