Compare Arrays

[Tj Superfly]

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.

 

[Todd Benson]

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)

More than two arrays is left as an exercise

Todd

 

[Peda, Allan (NYC-GIS)]

You are doing set operations, so I looked there first:
require 'set'
s1 =3D Set.new [1, 2, 7, 8, 9, 45, 98, 85, 39] =20
s2 =3D Set.new [1, 45, 66, 4, 84, 98 ]

p (s1 - s2) | (s2 - s1)



-----Original Message-----
From: Tj Superfly [mailto:[email protected]]
Sent: Sat 10/11/2008 11:50 PM
To: ruby-talk ML
Subject: Compare Arrays
=20
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.
--=20
Posted via http://www.ruby-forum.com/.




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(A)

 

[christoforever]

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.

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

 

[Brian Candler]

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

 

[Rüdiger Brahns]

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