Hi all,
Just wonder:
1)When substracting array2 from array1 to get the difference elements
between two arrays(array1-array2), must array1.size >= array2?
2)Is there mentod in Array class that can return the element only
unique to either of two arrays?
For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]
Thanks,
Li
--
Posted via http://www.ruby-forum.com/.
Hi all,
Just wonder:
1)When substracting array2 from array1 to get the difference elements
between two arrays(array1-array2), must array1.size >= array2?
irb is great for this stuff.
[1, 2] - [1, 3, 4]
=> [2]
2)Is there mentod in Array class that can return the element only
unique to either of two arrays?
http://ruby-doc.org/core/classes/Array.html
For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]
There might be a better way, but I came up with:
([1, 2, 3] - [1, 4, 7]) + ([1, 4, 7] - [1, 2, 3])
=> [2, 3, 4, 7]
On Tue, Sep 16, 2008 at 05:27:03AM +0900, Li Chen wrote:
--
nathan
nathan_at_nathanpowell_dot_org
What kind of crazy nut would spend two or three hours a day just running?
~ Steve Prefontaine
------------------------------------
Li Chen wrote:
(...)
2)Is there mentod in Array class that can return the element only
unique to either of two arrays?For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]Thanks,
Li
It's probably academic, but what is the desired result with these 2
arrays?
array1 = [1,2,2,3]
array2 = [1,4,7,7]
Nathan Powell's method: [2, 2, 3, 4, 7, 7]
Rob Biedenharn's method: [2, 3, 4, 7]
Perhaps desired result: [3,4] ?
Regards,
Siep
--
Posted via http://www.ruby-forum.com/\.
=> [2, 3, 4, 7]
-Rob
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
On Sep 15, 2008, at 4:42 PM, Nathan Powell wrote:
On Tue, Sep 16, 2008 at 05:27:03AM +0900, Li Chen wrote:
Hi all,
Just wonder:
1)When substracting array2 from array1 to get the difference elements
between two arrays(array1-array2), must array1.size >= array2?irb is great for this stuff.
[1, 2] - [1, 3, 4]
=> [2]
2)Is there mentod in Array class that can return the element only
unique to either of two arrays?class Array - RDoc Documentation
For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]There might be a better way, but I came up with:
([1, 2, 3] - [1, 4, 7]) + ([1, 4, 7] - [1, 2, 3])
=> [2, 3, 4, 7]
-- nathan
nathan_at_nathanpowell_dot_orgWhat kind of crazy nut would spend two or three hours a day just running?
~ Steve Prefontaine
------------------------------------
(a1 | a2) - (a1 & a2)
Nathan Powell wrote:
...
2)Is there mentod in Array class that can return the element only
unique to either of two arrays?class Array - RDoc Documentation
For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]There might be a better way, but I came up with:
([1, 2, 3] - [1, 4, 7]) + ([1, 4, 7] - [1, 2, 3])
=> [2, 3, 4, 7]
Or:
(a1|a2) - (a1&a2)
Or:
require 'set'
Set.new(a1) ^ Set.new(a2)
(I thought I remem
On Tue, Sep 16, 2008 at 05:27:03AM +0900, Li Chen wrote:
Joel VanderWerf wrote:
require 'set'
Set.new(a1) ^ Set.new(a2)(I thought I remem
bered that Array had a symmetric difference operator, but apparently not.)
--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407
Joel VanderWerf wrote:
(...)
Or:
require 'set'
Set.new(a1) ^ Set.new(a2)
I figured this out by typo, allthough it is in the documentation.
Anyway, you can do
Set.new(a1) ^ a2
if a2 is enumerable.
Regards,
Siep
--
Posted via http://www.ruby-forum.com/\.
Add the two arrays and call uniq on the new array
On Mon, Sep 15, 2008 at 4:39 PM, Siep Korteling <s.korteling@gmail.com> wrote:
Joel VanderWerf wrote:
(...)Or:
require 'set'
Set.new(a1) ^ Set.new(a2)I figured this out by typo, allthough it is in the documentation.
Anyway, you can do
Set.new(a1) ^ a2if a2 is enumerable.
Regards,
Siep
--
Posted via http://www.ruby-forum.com/\.
--
Amos King
A. King Software Development and Consulting, L.C.
http://dirtyInformation.com
--
Looking for something to do? Visit http://ImThere.com
=> [1, 2, 3, 4, 7]
That doesn't result in what he asked it to result in. I am not
convinced what I came up with was what he was really after either. I
think Siep was on to something.
On Tue, Sep 16, 2008 at 11:12:50PM +0900, Amos King wrote:
Add the two arrays and call uniq on the new array
([1, 2, 3] + [1, 4, 7]).uniq
--
nathan
nathan_at_nathanpowell_dot_org
What kind of crazy nut would spend two or three hours a day just running?
~ Steve Prefontaine
------------------------------------
We'll see.
On Tue, Sep 16, 2008 at 9:18 AM, Nathan Powell <nathan@nathanpowell.org> wrote:
On Tue, Sep 16, 2008 at 11:12:50PM +0900, Amos King wrote:
Add the two arrays and call uniq on the new array
([1, 2, 3] + [1, 4, 7]).uniq
=> [1, 2, 3, 4, 7]
That doesn't result in what he asked it to result in. I am not
convinced what I came up with was what he was really after either. I
think Siep was on to something.--
nathan
nathan_at_nathanpowell_dot_orgWhat kind of crazy nut would spend two or three hours a day just running?
~ Steve Prefontaine
------------------------------------
--
Amos King
A. King Software Development and Consulting, L.C.
http://dirtyInformation.com
--
Looking for something to do? Visit http://ImThere.com
Forgot to ask what he was looking for.
On Tue, Sep 16, 2008 at 9:29 AM, Amos King <amos.l.king@gmail.com> wrote:
We'll see.
On Tue, Sep 16, 2008 at 9:18 AM, Nathan Powell <nathan@nathanpowell.org> wrote:
On Tue, Sep 16, 2008 at 11:12:50PM +0900, Amos King wrote:
Add the two arrays and call uniq on the new array
([1, 2, 3] + [1, 4, 7]).uniq
=> [1, 2, 3, 4, 7]
That doesn't result in what he asked it to result in. I am not
convinced what I came up with was what he was really after either. I
think Siep was on to something.--
nathan
nathan_at_nathanpowell_dot_orgWhat kind of crazy nut would spend two or three hours a day just running?
~ Steve Prefontaine
--------------------------------------
Amos King
A. King Software Development and Consulting, L.C.
http://dirtyInformation.com
--
Looking for something to do? Visit http://ImThere.com
--
Amos King
A. King Software Development and Consulting, L.C.
http://dirtyInformation.com
--
Looking for something to do? Visit http://ImThere.com
In the original email:
<snip>
For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]
</snip>
It's not entirely clear as one could arrive at that final array a couple
ways.
On Tue, Sep 16, 2008 at 11:25:00PM +0900, Amos King wrote:
Forgot to ask what he was looking for.
--
nathan
nathan_at_nathanpowell_dot_org
At this point, anyone proposing to run Windows on servers should be prepared
to explain what they know about servers that Google, Yahoo, and Amazon don't.
~ Paul Graham
------------------------------------
Case 1 and 2, maybe the desired result?
irb(main):088:0> def there_can_be_only_one(arr)
irb(main):089:1> arr.sort!.collect {|x| (arr[arr.index(x)] !=
arr[arr.index(x)+1] ? x:nil)}.compact
irb(main):090:1> end
=> nil
irb(main):091:0> there_can_be_only_one([1,2,3] + [1,4,7])
=> [2, 3, 4, 7]
irb(main):092:0> there_can_be_only_one([1,2,2,3] + [1,4,7,7])
=> [3, 4]
irb(main):093:0>
...assumes the elements to be compared are all the same type (Fixnums
can't sort with Strings, eg)
On Tue, Sep 16, 2008 at 9:29 AM, Nathan Powell <nathan@nathanpowell.org> wrote:
On Tue, Sep 16, 2008 at 11:25:00PM +0900, Amos King wrote:
Forgot to ask what he was looking for.
In the original email:
<snip>
For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]
</snip>It's not entirely clear as one could arrive at that final array a couple
ways.--
nathan
nathan_at_nathanpowell_dot_orgAt this point, anyone proposing to run Windows on servers should be prepared
to explain what they know about servers that Google, Yahoo, and Amazon don't.
~ Paul Graham
------------------------------------
--
todb@planb-security.net | ICQ: 335082155 | Note: Due to Google's
privacy policy <http://tinyurl.com/5xbtl> and the United States'
policy on electronic surveillance <http://tinyurl.com/muuyl>,
please do not IM/e-mail me anything you wish to remain secret.
That only works if they are touching and that can be accomplished with
inject really easy.
([1,2,2,3]+[1,4,7,7]).sort..inject() { |final, e| fianl[-1] == e?
final[0..-2] : final << e }
#=> [3,4]
([1,2,3]+[1,4,7]).sort..inject() { |final, e| fianl[-1] == e?
final[0..-2] : final << e }
#=> [2,3,4,7]
although with the later one you can just do
([1,2,3]+[1,4,7]).uniq
On Tue, Sep 16, 2008 at 10:08 AM, Tod Beardsley <todb@planb-security.net> wrote:
Case 1 and 2, maybe the desired result?
irb(main):088:0> def there_can_be_only_one(arr)
irb(main):089:1> arr.sort!.collect {|x| (arr[arr.index(x)] !=
arr[arr.index(x)+1] ? x:nil)}.compact
irb(main):090:1> end
=> nil
irb(main):091:0> there_can_be_only_one([1,2,3] + [1,4,7])
=> [2, 3, 4, 7]
irb(main):092:0> there_can_be_only_one([1,2,2,3] + [1,4,7,7])
=> [3, 4]
irb(main):093:0>...assumes the elements to be compared are all the same type (Fixnums
can't sort with Strings, eg)On Tue, Sep 16, 2008 at 9:29 AM, Nathan Powell <nathan@nathanpowell.org> wrote:
On Tue, Sep 16, 2008 at 11:25:00PM +0900, Amos King wrote:
Forgot to ask what he was looking for.
In the original email:
<snip>
For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]
</snip>It's not entirely clear as one could arrive at that final array a couple
ways.--
nathan
nathan_at_nathanpowell_dot_orgAt this point, anyone proposing to run Windows on servers should be prepared
to explain what they know about servers that Google, Yahoo, and Amazon don't.
~ Paul Graham
--------------------------------------
todb@planb-security.net | ICQ: 335082155 | Note: Due to Google's
privacy policy <http://tinyurl.com/5xbtl> and the United States'
policy on electronic surveillance <http://tinyurl.com/muuyl>,
please do not IM/e-mail me anything you wish to remain secret.
--
Amos King
A. King Software Development and Consulting, L.C.
http://dirtyInformation.com
--
Looking for something to do? Visit http://ImThere.com