hello I have a question about the elements of a array up say i have array x=[1,2,3,4,5] and i want to add all the numbers up so the output would be 15 what would be the easiest way of doing this ? thanks for the help Gabriel --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On 18 Jun 2008, at 01:28, GabrielG1976 wrote:> > hello I have a question about the elements of a array up > > say i have array x=[1,2,3,4,5] > > and i want to add all the numbers up so the output would be 15 > > what would be the easiest way of doing this ? >x.sum Fred> thanks for the help > > Gabriel > >--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
well that didnt seem to work i did find a method that does work no im just trying to figure out how only add up the first 9 number form the array and then the last 9 numbers and be able to display them seperatly> > Gabriel--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
You will most likely need to iterate through the array. I would
duckpunch/monkeypatch Array if it''s used often (and create a sum
method, which does not exist in the standard library).
x=[1,2,3,4,5]
x.sum
# In Array >>
def sum
a=0
self.each {|i| a += i if i.is_a? Fixnum }
a
end
Not very elegant, but a good start!
Andrew.
On Jun 18, 11:00 am, GabrielG1976
<GabrielG1...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> well that didnt seem to work i did find a method that does work
>
> no im just trying to figure out how only add up the first 9 number
> form the array
> and then the last 9 numbers and be able to display them seperatly
>
> > > Gabriel
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---
Thanks On Jun 17, 7:45 pm, Buntz <i...-GHU7uA6dlx0U9tFV1dvWdAC/G2K4zDHf@public.gmane.org> wrote:> You will most likely need to iterate through the array. I would > duckpunch/monkeypatch Array if it''s used often (and create a sum > method, which does not exist in the standard library). > > x=[1,2,3,4,5] > x.sum > > # In Array >> > def sum > a=0 > self.each {|i| a += i if i.is_a? Fixnum } > a > end > > Not very elegant, but a good start! > > Andrew. > > On Jun 18, 11:00 am, GabrielG1976 <GabrielG1...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > > well that didnt seem to work i did find a method that does work > > > no im just trying to figure out how only add up the first 9 number > > form the array > > and then the last 9 numbers and be able to display them seperatly > > > > > Gabriel--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
From http://www.ruby-doc.org/core-1.8.4/classes/Enumerable.html#M002101
(5..10).inject {|sum, n| sum + n } #=> 45
so
[1, 2, 3].inject{|sum, n| sum + n } #=> 6
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---
regarding the first and last 9 elements -
a=%w(1 2 3 4 5 6 7 8 9 10 11 12)
a[0...9].inject{|sum, n| sum + n } #=> sum of your first 9
a[a.length-9...-1].inject{|sum, n| sum + n } #=> sum of your last 9
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---
On Jun 18, 2008, at 9:56 AM, ahab wrote:> regarding the first and last 9 elements - > > a=%w(1 2 3 4 5 6 7 8 9 10 11 12) > a[0...9].inject{|sum, n| sum + n } #=> sum of your first 9 > a[a.length-9...-1].inject{|sum, n| sum + n } #=> sum of your last 9a.first(9).inject{|sum, n| sum + n } #=> sum of your first 9 a.last(9).inject{|sum, n| sum + n } #=> sum of your last 9 Much more obvious (and works fine for a.length < 9, too). -Rob Rob Biedenharn http://agileconsultingllc.com Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
That''s just beautiful. -ahab http://www.ahabman.com --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On 18 Jun 2008, at 15:07, Rob Biedenharn wrote:> > On Jun 18, 2008, at 9:56 AM, ahab wrote: >> regarding the first and last 9 elements - >> >> a=%w(1 2 3 4 5 6 7 8 9 10 11 12) >> a[0...9].inject{|sum, n| sum + n } #=> sum of your first 9 >> a[a.length-9...-1].inject{|sum, n| sum + n } #=> sum of your last 9 > > > a.first(9).inject{|sum, n| sum + n } #=> sum of your first 9 > a.last(9).inject{|sum, n| sum + n } #=> sum of your last 9 >or a.first(9).sum etc... Fred> Much more obvious (and works fine for a.length < 9, too). > > -Rob > > Rob Biedenharn http://agileconsultingllc.com > Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org > > > > > >--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On Jun 18, 2008, at 12:59 PM, Frederick Cheung wrote:> On 18 Jun 2008, at 15:07, Rob Biedenharn wrote: >> On Jun 18, 2008, at 9:56 AM, ahab wrote: >>> regarding the first and last 9 elements - >>> >>> a=%w(1 2 3 4 5 6 7 8 9 10 11 12) >>> a[0...9].inject{|sum, n| sum + n } #=> sum of your first 9 >>> a[a.length-9...-1].inject{|sum, n| sum + n } #=> sum of your >>> last 9 >> >> >> a.first(9).inject{|sum, n| sum + n } #=> sum of your first 9 >> a.last(9).inject{|sum, n| sum + n } #=> sum of your last 9 >> > or a.first(9).sum etc... > > FredBut with plain vanilla Ruby 1.8.6: irb> [1,2,3].sum NoMethodError: undefined method `sum'' for [1, 2, 3]:Array from (irb):1 from :0 whereas #first and #last exist. -Rob>> Much more obvious (and works fine for a.length < 9, too). >> >> -Rob >> >> Rob Biedenharn http://agileconsultingllc.com >> Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Ya, Rails adds the sum method to Enumerable, so it should work within a rails app. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---