Arrays

Ruby
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:ineach’
from BLANK.rb:7

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

Thanks in advance!!!

2

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.

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:ineach’
from BLANK.rb:7

??