Forum: Ruby Rows and columns in a text file.

Hi all.

I'm doing an exercise where given a text file with words written in
columns or vertically, I have to put in another file, but horizontally.

For example, I have the file:

NNNNNNNN
AAAAAAAA
MMMMMMMM
EEEEEEEE
OTTFFSSE
NWHOIIEI
EORUVXVG
  ERE ET
  E   NH

I seek to place their names in another file like this:

NAMEONE
NAMETWO
NAMETHREE
NAMEFOUR
NAMEFIVE
NAMESIX
NAMESEVEN
NAMEEIGHT

This is the code you were doing (in this case I use an array to test if
it worked):

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

f = File.new ("names1.txt", "r")
#j = File.new ("names2.txt", "w+")
a = []
b = []

f.each do |line|
   a.push(line)
end
f.close

rows = 7
columns = 8

for i in 0..rows-1
   for j in 0..columns-1
   b.push(a[i][j])
end

puts b

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

The issue is that I find the way the words are written horizontally, if
I try to access their values ​​one by one, it seems that the place
properly, but if I use a cycle does not work.

Thanks

I imagine there's something you could do like:

f.each.map{|line|line.scan /./ }.transpose.map{|col|col.join}

But I just made that up.

Sent from my phone, so excuse the typos.

results = nil

File.open ("data.txt") do |f|
  lines = f.readlines
  results = Array.new(lines[0].length - 1) { "" }   #--> ["", "", ...]

  lines.each do |line|
    line = line.chomp

    line.each_char.with_index do |char, row|
      next if char == " "
      results[row] << char
    end
  end

end  #File is closed automatically here



--output:--
["NAMEONE", "NAMETWO", "NAMETHREE", "NAMEFOUR", "NAMEFIVE", "NAMESIX",
"NAMESEVEN", "NAMEEIGTH"]

Joao Silva wrote in post #1088123:
>
> f = File.new ("names1.txt", "r")
> #j = File.new ("names2.txt", "w+")
> a = []
> b = []
>
> f.each do |line|
>    a.push(line)
> end
> f.close
>
> rows = 7
> columns = 8
>
> for i in 0..rows-1
>    for j in 0..columns-1
>    b.push(a[i][j])
> end
>
> puts b
>
> ########################################################################
>
> The issue is that I find the way the words are written horizontally, if
> I try to access their values ​​one by one, it seems that the place
> properly, but if I use a cycle does not work.
>
> Thanks


results = []
rows = 9
columns = 8

File.open ("data.txt") do |f|
  lines = f.readlines

  (0...columns).each do |column|
    string = ""

    (0...rows).each do |row|
      current_char = lines[row][column]
      next if current_char == " "
      string << current_char
    end

    results.push string
  end

end



--output:--
["NAMEONE", "NAMETWO", "NAMETHREE", "NAMEFOUR", "NAMEFIVE", "NAMESIX",
"NAMESEVEN", "NAMEEIGTH"]

On Fri, Dec 7, 2012 at 4:24 AM, 7stud -- <lists@ruby-forum.com> wrote:
> Joao Silva wrote in post #1088123:

> results = []
> rows = 9
> columns = 8

Hey, that's cheating. :-) The algorithm must determine these from the 
input.

Two more solutions

puts "-- 1 --"

lines = []
max = 0

File.foreach "t" do |line|
  line.chomp!
  lines << line
  max = [max, line.length].max
end

max.times do |i|
  puts lines.map {|l| l[i] || ' '}.join
end

puts "-- 2 --"

lines = []

File.foreach "t" do |line|
  line.chomp!
  line.each_char.each_with_index do |c, i|
    (lines[i] ||= '') << c
  end
end

puts lines


Kind regards

robert