From: sto.mar@...
Date: 2013-07-11T23:04:42+09:00
Subject: Re: create variables depending on counter

Am 11.07.2013 09:34, schrieb stefan heinrich:
> my code to read out the tablewidget and create the array.
>
>      array = Array.new
>
>      for i in 0..rowCount - 1
>        tmp = Array.new
>        tmp << @tableWidget.item(i, 1).text.to_a
>        tmp << @tableWidget.item(i, 0).text.to_a
>        tmp = tmp[0] + tmp[1]
>
>        array << tmp
>      end
>
>      array.group_by {|s,i| s}
>      array= array.group_by {|s,i| s}.each {|k,v| v.map! {|s,i| i}}
>
> The 2d array looks like this after grouping
>
> {"I OFF"=>["a8", "1e"], "E OFF"=>["98", "a0"], "Emphasized ON"=>["db"],
> "I ON"=>["99"]}
>
> It seems like after using grouping by it is not an array anymore.

Yes indeed, as mentioned several times in the previous posts, we are
talking about a **Hash** of key-value pairs (where the values in this
case are arrays). And I already demonstrated in my examples how you
can access the stored arrays separately.

A reminder:

   data = {"I OFF"=>["a8", "1e"], "E OFF"=>["98", "a0"], "Emphasized 
ON"=>["db"], "I ON"=>["99"]}
   p data['I OFF']  # => ["a8", "1e"]

Also, I would like to repeat myself:

   > I suggest you also look into the docs for the Hash class and
   > make heavy use of irb.

And: Try to figure out what happens in the code examples that
people provide here.

Regards,
Marcus


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