From: Robert Klemme <shortcutter@...>
Date: 2006-10-20T17:35:13+09:00
Subject: Re: filling an array excepted first and last position...

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)

> 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