Hey, I just have a quick question about arrays.
I have two different ones that I would like to compare.
Example:
Array 1: cats, dogs, monkeys
Array 2: cats, fish, dogs, birds, monkeys
Now, I would like to compare array 2 with array 1 and have it spit out
any words that aren't in both... if that makes sense.
So what the program should output is fish, monkeys.
--
Posted via http://www.ruby-forum.com/.
Hmm. I'm assuming you are looking for ["fish", "birds"], and if you
are, do union, then subtract intersection...
a = %w( cats dogs monkeys )
b = %w( cats fish dogs birds monkeys )
(a | b) - (a & b)
More than two arrays is left as an exercise 
Todd
On Sat, Oct 11, 2008 at 10:50 PM, Tj Superfly <nonstickglue@verizon.net> wrote:
Hey, I just have a quick question about arrays.
I have two different ones that I would like to compare.
Example:
Array 1: cats, dogs, monkeys
Array 2: cats, fish, dogs, birds, monkeys
Now, I would like to compare array 2 with array 1 and have it spit out
any words that aren't in both... if that makes sense.So what the program should output is fish, monkeys.
You are doing set operations, so I looked there first:
require 'set'
s1 = Set.new [1, 2, 7, 8, 9, 45, 98, 85, 39]
s2 = Set.new [1, 45, 66, 4, 84, 98 ]
p (s1 - s2) | (s2 - s1)
-----Original Message-----
From: Tj Superfly [mailto:nonstickglue@verizon.net]
Sent: Sat 10/11/2008 11:50 PM
To: ruby-talk ML
Subject: Compare Arrays
Hey, I just have a quick question about arrays.
I have two different ones that I would like to compare.
Example:
Array 1: cats, dogs, monkeys
Array 2: cats, fish, dogs, birds, monkeys
Now, I would like to compare array 2 with array 1 and have it spit out
any words that aren't in both... if that makes sense.
So what the program should output is fish, monkeys.
--
Posted via http://www.ruby-forum.com/.
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(A)
Im assuming the elements in the array are strings so.....
so we have arr1 and arr2 with the previous mentioned elements i guess
you could make a method something like this and then depending on how
your comparing these elements...
def print_elements_not_in_array
arr1.each do |temp|
arr2.each do |temp2|
puts " #{temp2} " if temp1 != temp2
end
end
end
On Oct 11, 11:50 pm, Tj Superfly <nonstickg...@verizon.net> wrote:
Hey, I just have a quick question about arrays.
I have two different ones that I would like to compare.
Example:
Array 1: cats, dogs, monkeys
Array 2: cats, fish, dogs, birds, monkeys
Now, I would like to compare array 2 with array 1 and have it spit out
any words that aren't in both... if that makes sense.So what the program should output is fish, monkeys.
--
Posted viahttp://www.ruby-forum.com/.
Tj Superfly wrote:
Hey, I just have a quick question about arrays.
I have two different ones that I would like to compare.
Example:
Array 1: cats, dogs, monkeys
Array 2: cats, fish, dogs, birds, monkeys
Now, I would like to compare array 2 with array 1 and have it spit out
any words that aren't in both... if that makes sense.So what the program should output is fish, monkeys.
If arr2 is always a superset of arr1, then arr2-arr1
--
Posted via http://www.ruby-forum.com/\.
Todd Benson schrieb:
On Sat, Oct 11, 2008 at 10:50 PM, Tj Superfly <nonstickglue@verizon.net> wrote:
Hey, I just have a quick question about arrays.
I have two different ones that I would like to compare.
Example:
Array 1: cats, dogs, monkeys
Array 2: cats, fish, dogs, birds, monkeys
Now, I would like to compare array 2 with array 1 and have it spit out
any words that aren't in both... if that makes sense.So what the program should output is fish, monkeys.
Hmm. I'm assuming you are looking for ["fish", "birds"], and if you
are, do union, then subtract intersection...a = %w( cats dogs monkeys )
b = %w( cats fish dogs birds monkeys )(a | b) - (a & b)
Why not just
b - a
? But as I understand him what he wants is
a & b
Hi --
Todd Benson schrieb:
Hey, I just have a quick question about arrays.
I have two different ones that I would like to compare.
Example:
Array 1: cats, dogs, monkeys
Array 2: cats, fish, dogs, birds, monkeys
Now, I would like to compare array 2 with array 1 and have it spit out
any words that aren't in both... if that makes sense.So what the program should output is fish, monkeys.
Hmm. I'm assuming you are looking for ["fish", "birds"], and if you
are, do union, then subtract intersection...a = %w( cats dogs monkeys )
b = %w( cats fish dogs birds monkeys )(a | b) - (a & b)
Why not just
b - a
As Brian C. said, that works but only if b is always a superset of a.
If not, you get:
[1,2,3] - [2,3,4] # [1], should be [1,4]
? But as I understand him what he wants is
a & b
I think he wants:
a ^ b # exclusive or
which unfortunately doesn't exist It's basically
(a | b) - (a & b)
which I think someone else posted. Or, if you don't want to create
that many intermediate arrays, you could do:
module EnumExOr
def ^(other)
reject {|e| other.include?(e) }.
concat(other.reject {|e| include?(e) })
end
end
array = [1,2,3,4,5].extend(EnumExOr)
p array ^ [3,4,5,6,7] # [1,2,6,7]
David
On Sun, 12 Oct 2008, Rüdiger Brahns wrote:
On Sat, Oct 11, 2008 at 10:50 PM, Tj Superfly <nonstickglue@verizon.net> >> wrote:
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