# Arrays

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))

values[modArr.size][0] = x.chomp

freq[modArr.size][0] += 1

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??

I’ve replied below.

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

key–
values[modArr.size][0] = x.chomp
end

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 B.

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))

values[modArr.size].push(x.chomp)

freq[modArr.size].push(1)

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