From: Josselin <josselin@...>
Date: 2006-10-20T20:40:07+09:00
Subject: Re: filling an array excepted first and last position...

On 2006-10-20 10:32:18 +0200, Robert Klemme <shortcutter@googlemail.com> said:

> On 20.10.2006 09:59, Josselin wrote:
>> ldom =  30  # variable (last day of a month...)
>> 
>> # array init to 0
>>  @obk = []
>>  1.step(ldom, 1) do |i|
>>    @obk[i] = 0
>>  end
> 
> @obk = Array.new(ldom, 0)
better  ,  avoiding @obk[0] = nil ...
> 
>> I am filling an array as follows  (part of a larger filling scheme) :
>> ----
>> #fiiling the array upon another array content
>> # but I'd like to AVOID filling the first and last position in this loop....
>>    obdays.each do |bd|
>>        @obk[bd] = 1
>>    end
>> ------
>> # ajusting first and last position (in the larger scheme)
>>    @obk[obdays.first] += -1
>>    @obk[obdays.last] += -2
> 
> I am not exactly sure what problem you have with this approach.  Here 
> is a different one
> 
> obdays.each_with_index do |bd, idx|
>    case idx
>      when 0
>        # ignore, @obk[bd] is 0 already
>      when obdays.length - 1
>        # set to 1 + (-2) = -1
>        @obk[bd] = -1
>      else
>        @obk[bd] = 1
>    end
> end
> 
> Does that help?
> 
> 	robert

yes and no, I cannot test @obk[bd] == 0 as it may change....  as 
indicated in one of my response post