From: Stuart Clarke <stuart.clarke1986@...>
Date: 2008-12-18T23:50:11+09:00
Subject: Re: Using ruby hash on array


Sorry for not being clear. I am actually parsing data from Windows event 
logs and as a result the data is held in structured fields. Earlier in 
my program I load the contents of a number of event logs into an array 
and then ready the data using structs for example to read the ID number 
- event.event_id more complicated for descriptions - 
event.description[/Name:\t(.+?)\r\n/, 1]}

So what I would like to do is read my event log array and check for 
specific event ID's (if event.event_id == 100).

If the if statement finds the ID 100 it reads name from 
event.description. Everything mention thus far is working correctly.

When this is complete I then want to do a count on how many times each 
name occurs e.g. bob = 2, sue = 12.
My thoughts were to load the event.description[/name:/] into a hash and 
then do a count on each name in the hash and print it out.

Does this make more sense??


Robert Klemme wrote:
> 2008/12/17 Stuart Clarke <stuart.clarke1986@gmail.com>:
>> I would like to process some data from an array and using hash to
>> perform a count on one aspect of the data in the array. The array holds
>> lines of similarly formatted data like so
>>
>> data A      data B     data C     data D     data E     data F
>> data A      data B     data C     data D     data E     data F
>> data A      data B     data C     data D     data E     data F
> 
> You do not say whether the format is delimited or fixed width.
> 
>> end
>> count data F to determine the number of each name extracted by the
>> regular expression
>> print bob 6, sue 12, tim 1
> 
> A framework:
> 
> Data = Struct.new :a, :b:, :c, :d, :e, :f
> 
> def Data.parse(line)
>   d = new(*line.strip.split(/\s+/))
>   d.f = Integer(d.f)
>   d
> end
> 
> count = Hash.new 0
> 
> ARGF.each do |line|
>   data = Data.parse(line)
>   count[data.f[/Name:\t(.+?)\r\n/, 1]] += 1 if data.a == 100
> end
> 
> count.each do |a, cnt|
>   printf "%20s %6d\n", a, cnt
> end
> 
> Kind regards
> 
> robert

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