Hello,
I have prepared the following code (it almost works for even size
strings). I wanna create 2-chars vectors from ASCII codes and push them
on the stack, then proceed by algebra functions (Hill cipher). I don't
want use encryption library, because it's academic exercise (I can use
any language).

#!/usr/bin/env ruby

require 'matrix'

print "Message: "
msg = gets.chomp

# stack with matrices
stack = []
# make matrix with column
i = 0
column = [0, 0]
msg.each_byte do |char|
  # create two-element vector
  column[0] = char if i == 0
  if i == 1
    column[1] = char
    # put vector on stack
    puts "Input data: #{column[0]}, #{column[1]}"
    tmp = Matrix[column[0], column[1]]
    puts "Output data: #{tmp[0,0]} #{tmp[0,1]}"
    stack.push(tmp)
    i = 0
    next
  end
  i += 1
end

The output data is invalid, i don't store input data in tmp Matrix class
variable. Why?

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