From: "Ralf Müller" <r_mueller@...>
Date: 2004-06-17T16:48:21+09:00
Subject: Re: Possibly improvable code

11111111111111111111111111111111111111111111111111111111111111
ram@lilith:~/src/ruby$cat rec_pi.rb 
n = STDIN.gets
  tot = 0
  9.times do |i|
    c = n.count(i.to_s)
    tot += c
    puts "#{i} #{c}"
  end
  puts "9 #{n.size - tot}"

ram@lilith:~/src/ruby$time ruby  rec_pi.rb < pi.out 
0 16095
1 16107
2 15965
3 15915
4 15967
5 16169
6 15934
7 16091
8 15999
9 15790

real    0m0.045s
user    0m0.040s
sys     0m0.000s

22222222222222222222222222222222222222222222222222222222222222222
ram@lilith:~/src/ruby$cat rec_pi_a.rb 
c={};
$_.each_byte{|b| c[b]||=0; c[b]+=1 }; 
c.sort.each {|k,v| puts "#{k - ?0} #{v}"}

ram@lilith:~/src/ruby$time ruby  -n rec_pi_a.rb < pi.out 
0 16095
1 16107
2 15965
3 15915
4 15967
5 16169
6 15934
7 16091
8 15999
9 15790

real    0m0.260s
user    0m0.240s
sys     0m0.010s

3333333333333333333333333333333333333333333333333333333333333333333
ram@lilith:~/src/ruby$cat rec_pi_b.rb 
num = STDIN.gets;
a = Array.new(255,0);
num.each_byte {|i| a[i] += 1};
(?0..?9).each {|i| print "#{[i].pack("c")} #{a[i]}\n"};

ram@lilith:~/src/ruby$time ruby  rec_pi_b.rb < pi.out 
0 16095
1 16107
2 15965
3 15915
4 15967
5 16169
6 15934
7 16091
8 15999
9 15790

real    0m0.194s
user    0m0.160s
sys     0m0.010s

####################################################################

The main difference seems to be using "count" instead of "each_byte". But why 
is it 5-6x faster to "count" 9.times than "each_byte" only once?
Or did i ignore anything?

ralf
(-,-)Zzz