From: Josselin <josselin@...>
Date: 2006-10-21T15:35:04+09:00
Subject: Re: filling an array excepted first and last position...

On 2006-10-20 13:40:44 +0200, Robert Klemme <shortcutter@googlemail.com> said:

> On 20.10.2006 13:35, Josselin wrote:
>> 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
> 
> ??? There is no test for @obk[bd] == 0 in the code above.  It's a bit 
> difficult to guess what you really want with the information I have 
> seen.
> 
> Cheers
> 
> 	robert

Thanks Robert, I solved the problem creating a sub-range without the 
first and last position of the the initial range

      other_booking_days = (bk.start_at.day..bk.end_at.day)

      @obk[other_booking_days.first] += -1
      	obd = (bk.start_at.day+1..bk.end_at.day-1)
      	obd.each {|bd| @obk[bd] = 1 }
      @obk[other_booking_days.last] += -2

all range is initialized to 0
first and last position in the range act like incremental counters..
in between just get a   value