From: Robert Dober <robert.dober@...>
Date: 2009-06-15T21:21:30+09:00
Subject: Re: formatting a listing

On Mon, Jun 15, 2009 at 2:12 PM, George George<george.githinji@gmail.com> wrote:
> Robert Dober wrote:
>> On Mon, Jun 15, 2009 at 12:46 PM, George
>> George<george.githinji@gmail.com> wrote:
>>> 3
>>> any ideas?
>>> thanks
>>
>> If this is a homework assignement I am terribly sorry, but I cannot
>> know.
>>
>> puts DATA.inject( [  [] ] ){ | ary, ele |
>>   ele.strip.empty? ? ary << [] : ary.last << ele.to_i # or ele.chomp
>> if you prefer
>>   ary
>> }
>> .reject( &:empty? )  # .map( &:join, ", " ) is not standard Ruby
>> .map{ | eles | eles.join( ", " )}
>>
>> __END__
>> 1
>> 2
>>
>> 42
>> 44
>> 46
>>
>> 2000
>>
>> HTH
>> Robert
>
> Thank so much for pointing the way: And this is not assignment! :) Am
> working on some huge datasets that run in to up to 20 000 columns and
> was looking for an easy way of creating the columns.
If you have perf problems do not worry, inject is slow replace
inject(x){ |a,e|
 }
with
loc = x
each { |e|
    loc << e # e.g
}
loc
# you will have a speedup of 2~3