04-02-2009
Hmm.... I don't quite understand the logic how you determine the 'intersection'...
What does that mean:
Quote:
The result i´m looking for is intersection with A B C D F
so the answer here will be
7 8 9 2 3
So how do we do a intersection using to compare just the column 1 .
Can you try explaining again, please.
Last edited by vgersh99; 04-02-2009 at 11:23 AM..
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sets(3erl) Erlang Module Definition sets(3erl)
NAME
sets - Functions for Set Manipulation
DESCRIPTION
Sets are collections of elements with no duplicate elements. The representation of a set is not defined.
This module provides exactly the same interface as the module ordsets but with a defined representation. One difference is that while this
module considers two elements as different if they do not match ( =:= ), ordsets considers two elements as different if and only if they do
not compare equal ( == ).
DATA TYPES
set()
as returned by new/0
EXPORTS
new() -> Set
Types Set = set()
Returns a new empty set.
is_set(Set) -> bool()
Types Set = term()
Returns true if Set is a set of elements, otherwise false .
size(Set) -> int()
Types Set = term()
Returns the number of elements in Set .
to_list(Set) -> List
Types Set = set()
List = [term()]
Returns the elements of Set as a list.
from_list(List) -> Set
Types List = [term()]
Set = set()
Returns an set of the elements in List .
is_element(Element, Set) -> bool()
Types Element = term()
Set = set()
Returns true if Element is an element of Set , otherwise false .
add_element(Element, Set1) -> Set2
Types Element = term()
Set1 = Set2 = set()
Returns a new set formed from Set1 with Element inserted.
del_element(Element, Set1) -> Set2
Types Element = term()
Set1 = Set2 = set()
Returns Set1 , but with Element removed.
union(Set1, Set2) -> Set3
Types Set1 = Set2 = Set3 = set()
Returns the merged (union) set of Set1 and Set2 .
union(SetList) -> Set
Types SetList = [set()]
Set = set()
Returns the merged (union) set of the list of sets.
intersection(Set1, Set2) -> Set3
Types Set1 = Set2 = Set3 = set()
Returns the intersection of Set1 and Set2 .
intersection(SetList) -> Set
Types SetList = [set()]
Set = set()
Returns the intersection of the non-empty list of sets.
is_disjoint(Set1, Set2) -> bool()
Types Set1 = Set2 = set()
Returns true if Set1 and Set2 are disjoint (have no elements in common), and false otherwise.
subtract(Set1, Set2) -> Set3
Types Set1 = Set2 = Set3 = set()
Returns only the elements of Set1 which are not also elements of Set2 .
is_subset(Set1, Set2) -> bool()
Types Set1 = Set2 = set()
Returns true when every element of Set 1 is also a member of Set2 , otherwise false .
fold(Function, Acc0, Set) -> Acc1
Types Function = fun (E, AccIn) -> AccOut
Acc0 = Acc1 = AccIn = AccOut = term()
Set = set()
Fold Function over every element in Set returning the final value of the accumulator.
filter(Pred, Set1) -> Set2
Types Pred = fun (E) -> bool()
Set1 = Set2 = set()
Filter elements in Set1 with boolean function Fun .
SEE ALSO
ordsets(3erl) , gb_sets(3erl)
Ericsson AB stdlib 1.17.3 sets(3erl)