From: "Charles L. Snyder" <csnyder1@...>
Date: 2005-06-22T07:50:36+09:00
Subject: Histogram-type Data

Hi,
 I have a text-parsing question -

array1 = ["Joe lives in France", "Sue goes to Japan", "Hiro walked around
France", "Bill moved to England"]
a_countries = ["France", "Japan", "England", "Spain"]

desired result is unique list (hash table)  of all countries mentioned in
the sentences in array1, with frequency of occurence - eg,

France        2
Japan         1
England       1
Spain            0

neither of these (below) works:

a_countries.each do |h|
x = array1.inject([]){|menu,e| menu<< h if country_list.include?(e);menu}
end

x = array1.inject([]){|menu,e| menu<< $& if /#{a_countries.each}/ =~ e;
menu}