From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-08-06T04:31:07+09:00
Subject: Re: algorithm help

On Sat, 6 Aug 2005, daz wrote:

>
> Ara.T.Howard wrote:
>> On Fri, 5 Aug 2005, Robert Klemme wrote:
>>
>>> Btw, here's another funny idea:
>>> [snip code]
>>
>> not bad (and *so* short), but failing for descending ranges [...]
>>
>
>
> Descending ranges don't have much method support in Ruby, though.
>
> rg = (43..41)
>
> p rg.include?(42) #-> false
> p rg.max          #-> nil
> p rg.to_a         #-> []
>
> .... and others.

but

   harp:~ > irb -r narray
   irb(main):001:0> na = NArray::to_na [1,2,3,4]

   => NArray.int(4):
   [ 1, 2, 3, 4 ]

   irb(main):002:0> na[ -3 .. -1 ]
   => NArray.int(3):
   [ 2, 3, 4 ]

   irb(main):003:0> na[ -1 .. -3 ]
   => NArray.int(3):
   [ 4, 3, 2 ]

which is precisely what i'm doing.

cheers.

-a
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