Arrays

ruby-talk
1

modArr = Array.new
freq = Array.new([ [0] ])
values = Array.new([ [] ])

#--------------Open the output file and process each line-----
File.open('output.txt', 'r').each { |x|

#-------------Create unique keys according to |x|---------------
    #--Calculate the modulus ([add each digit]%10) and use it as hash
key--
    key = 0; modF = x.each_byte { |y| key += y.chr.to_i }
    #--For slight optimization, change the resulting key into a symbol
    mod = (key%100).to_s.intern

      #--If the key D.N.E. then add it into modArr

      if(!modArr.include?(mod))

        #--Add the value
        values[modArr.size][0] = x.chomp

        #--Add the frequency
        freq[modArr.size][0] += 1

        #--Add the mod
        modArr[modArr.size] = mod

        end

}

Hi, I'm still trying to work on the same problem that I posted a few
days ago... when i run this program, this error reads:

BLANK.rb:22: undefined method `[]=' for nil:NilClass (NoMethodError)
  from BLANK.rb:7:in `each'
  from BLANK.rb:7

Why is this? And how do I fix it??

Thanks in advance!!!!!

···

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Posted via http://www.ruby-forum.com/.

2

I've replied below.

···

On Jun 6, 2008, at 3:11 PM, Justin To wrote:

modArr = Array.new
freq = Array.new([ [0] ])
values = Array.new([ ])

#--------------Open the output file and process each line-----
File.open('output.txt', 'r').each { |x|

#-------------Create unique keys according to |x|---------------
   #--Calculate the modulus ([add each digit]%10) and use it as hash
key--
   key = 0; modF = x.each_byte { |y| key += y.chr.to_i }
   #--For slight optimization, change the resulting key into a symbol
   mod = (key%100).to_s.intern

     #--If the key D.N.E. then add it into modArr

     if(!modArr.include?(mod))

       #--Add the value
       values[modArr.size][0] = x.chomp

       #--Add the frequency
       freq[modArr.size][0] += 1

       #--Add the mod
       modArr[modArr.size] = mod

       end

}

Hi, I'm still trying to work on the same problem that I posted a few
days ago... when i run this program, this error reads:

BLANK.rb:22: undefined method `=' for nil:NilClass (NoMethodError)
from BLANK.rb:7:in `each'
from BLANK.rb:7

Why is this? And how do I fix it??

You're using a rather unconventional way of appending to an array, i.e. ary[ary.size] = value. This works in the general case. Where it doesn't work is in your code where you say, effectively, ary[ary.size][0] = value. The problem is that ary[ary.size] is returning nil.

-Kevin Ballard

--
Kevin Ballard
http://kevin.sb.org
kevin@sb.org
http://www.tildesoft.com

3

modArr = Array.new
freq = Array.new([ [0] ])
values = Array.new([ [] ])

#--------------Open the output file and process each line-----
File.open('output.txt', 'r').each { |x|

#-------------Create unique keys according to |x|---------------
    #--Calculate the modulus ([add each digit]%10) and use it as hash
key--
    key = 0; modF = x.each_byte { |y| key += y.chr.to_i }
    #--For slight optimization, change the resulting key into a symbol
    mod = (key%100).to_s.intern

      if(!modArr.include?(mod))

        #--Add the value
        values[modArr.size].push(x.chomp)

        #--Add the frequency
        freq[modArr.size].push(1)

        #--Add the mod
        modArr.push(mod)

        end

}

BLANK.rb:22: undefined method `push' for nil:NilClass (NoMethodError)
  from BLANK.rb:7:in `each'
  from BLANK.rb:7

??

···

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