07-26-2012
Compare two lists with perl
Hi everybody!
I'm trying to delete some elements from a list with two elements on each row agreeing with the elements in another list. Pratically I want a perl script able to take each element of the second list (that is a single column list), compare it with both elements of each row from the first list and write only the elements that differ from the single column list elements.
The single column list is a simple list of things like:
id_1
id_2
id_3
The other list is made with thwo elements on the same row separeted by a | and look like:
id_16|id_32
id_2|id_42
id_7|id_99
The result that I wish look like:
id_16|id_32
id_7|id_99
Any help is wished! thank you in advance!!!
Last edited by gabrysfe; 07-26-2012 at 01:45 PM..
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LEARN ABOUT MOJAVE
lrange
lrange(n) Tcl Built-In Commands lrange(n)
__________________________________________________________________________________________________________________________________________________
NAME
lrange - Return one or more adjacent elements from a list
SYNOPSIS
lrange list first last
_________________________________________________________________
DESCRIPTION
List must be a valid Tcl list. This command will return a new list consisting of elements first through last, inclusive. The index values |
first and last are interpreted the same as index values for the command string index, supporting simple index arithmetic and indices rela- |
tive to the end of the list. If first is less than zero, it is treated as if it were zero. If last is greater than or equal to the number
of elements in the list, then it is treated as if it were end. If first is greater than last then an empty string is returned. Note:
"lrange list first first" does not always produce the same result as "lindex list first" (although it often does for simple fields that are
not enclosed in braces); it does, however, produce exactly the same results as "list [lindex list first]"
EXAMPLES
Selecting the first two elements:
% lrange {a b c d e} 0 1
a b
Selecting the last three elements:
% lrange {a b c d e} end-2 end
c d e
Selecting everything except the first and last element:
% lrange {a b c d e} 1 end-1
b c d
Selecting a single element with lrange is not the same as doing so with lindex:
% set var {some {elements to} select}
some {elements to} select
% lindex $var 1
elements to
% lrange $var 1 1
{elements to}
SEE ALSO
list(n), lappend(n), lindex(n), linsert(n), llength(n), lsearch(n), lset(n), lreplace(n), lsort(n), string(n) |
KEYWORDS
element, list, range, sublist
Tcl 7.4 lrange(n)