From: "Aaron D. Gifford" <astounding@...>
Date: 2010-02-15T02:12:35+09:00
Subject: Re: Searching in arrays

On Sun, Feb 14, 2010 at 4:20 AM, Szabolcs T. <toth@kw.gbm.ihost.com> wrote:
> Dears, I have two .txt files. I read both into arrays and I would like
> to match the lines containing the same words. The words should come from
> a separate text (input.txt) file. This is what I have done:
>
> # Open the file - get a file handle
> test1 = File.new "OpenSystemHO.txt"
> test2 = File.new "OpenSystemDR.txt"
>
> myArray= Array.new
>  myArray=[]  # start with an empty array
>  test1.each_line {|line|
>    myArray.push line
>  }

### CODE BEGINS ###

# You can initialize each array in a single line:
array1 = File.open("OpenSystemHO.txt", 'r').map{|x| x.chomp}
array2 = File.open("OpenSystemDR.txt", 'r').map{|x| x.chomp}

# Your code includes the end-of-line character(s) in each
# array entry.  Note the "chomp" above to trim off end-of-line
# characters.  You could use your existing code and add a
# chomp:
#    myArray.push line.chomp
#
# Your 'interest = gets' line also includes end-of-line
# character(s).  May I suggest adding a chomp! too?
#
# WARNING: This will match ALL lines of BOTH files
# if interest is blank/empty:

counter = 0  # Counter for unique file naming (see below)
while interest = gets
  interest.chomp!  # Remove end-of-line character(s)

  # You can create an array containing ONLY matching
  # lines using the Array#select() method:
  matches1 = array1.select{|e| e.include?(interest)}
  matches2 = array2.select{|e| e.include?(interest)}

  # Print the matches:
  puts "Lines (#{matches1.length}) from OpenSystemHO.txt that match
'#{interest}':"
  puts matches1  # One match per line
  puts "Lines (#{matches2.length}) from OpenSystemDR.txt that match
'#{interest}':"
  puts matches2.map{|m| '*' + m}  # One match per line prepended with "*"

  # Save matches to files:
  counter += 1  # Counter for unique file naming

  puts "Saving array1 matches to file: OpenSystemHO.match-#{counter}.txt"
  File.new("OpenSystemHO.match-#{counter}.txt", 'w').puts(matches1)

  puts "Saving array2 matches to file: OpenSystemHO.match-#{counter}.txt"
  File.new("OpenSystemDR.match-#{counter}.txt", 'w').puts(matches2)
end

### CODE ENDS ###

> Problem 1: if I have only 1 word in the text file to search it works
> fine but if I have two, searching only the second (last) one.

I'm not sure exactly what you are saying.  I suspect it has to do with
your code matching only the line ends of each file (due to your code
including line terminator characters).

>Problem 2: how can I write one file from one array one from the other
> and not grouping the result of array1 and array2.

The above sample code also shows you how you could write the matches
to an output file or files (if desired).

I hope that's helpful.

Aaron out.