Two possible approaches:
irb(main):002:0> a = Array.new(10) { rand(4) }
=> [3, 2, 2, 1, 3, 3, 2, 3, 3, 3]
irb(main):003:0> a.inject(Hash.new(0)) {|sums,x| sums += 1; sums}
=> {3=>6, 2=>3, 1=>1}
irb(main):004:0> a.group_by {|x| x}
=> {3=>[3, 3, 3, 3, 3, 3], 2=>[2, 2, 2], 1=>[1]}
irb(main):005:0> a.group_by {|x| x}.map {|k,v| [k, v.size]}
=> [[3, 6], [2, 3], [1, 1]]
Instead of #inject you can of course also use a more traditional approach:
irb(main):012:0> counts = Hash.new 0
=> {}
irb(main):013:0> a.each {|x| counts += 1}
=> [3, 2, 2, 1, 3, 3, 2, 3, 3, 3]
irb(main):014:0> counts
=> {3=>6, 2=>3, 1=>1}
Kind regards
robert
···
On 15.05.2011 12:01, Thomas Greenwood wrote:
There's probably a fairly simple way to do this.
Basically I'm reading data from an xml file, I need to figure out how
many times identical data occurs in certain attributes, so far I've got
the data into two identical arrays and had the intention of nesting
iterators - seeing if the element was equal to the second and
incrementing every time a match was found. That obviously didn't work
out the way I initially thought.
This seems to be the jist of what I want but it's obviously returning a
count on every iteraton whereas I only want the final tally.
xml_events.each{|x|
puts "#{x} occurs #{xml_events.count(x)} times"
}
Any ideas?
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/