From: ara.t.howard@...
Date: 2006-06-23T11:35:10+09:00
Subject: Re: Multidimensional ".index" ?

On Fri, 23 Jun 2006, Meino Christian Cramer wrote:

> Hi,
>
> a=[1,2,3,4]
> a.index(3)  -> 2
>
> Is there any way to do such things:
>
> a=[[1,2,3,4],[5,6,7,8],[9,10,11,12]]
>
> a.index(6)  -> [1,1]
>
>
> may be for n-dimensional arrays, too ?
>
> Thank you very much for any helpful reply in advance !
>
> Keep ruby!
> mcc

   harp:~ > cat a.rb
   require 'narray'

   na = NArray.to_na [
         [1,2,3,4],
         [5,6,7,8],
         [9,10,11,12]
        ]

   idx = na.eq 7
   p idx
   p na[idx]

   idx = na.eq(7).or(na.eq(12))
   p idx
   p na[idx]

   idx = na.gt 6
   p idx
   p na[idx]



   harp:~ > ruby a.rb
   NArray.byte(4,3):
   [ [ 0, 0, 0, 0 ],
     [ 0, 0, 1, 0 ],
     [ 0, 0, 0, 0 ] ]
   NArray.int(1):
   [ 7 ]
   NArray.byte(4,3):
   [ [ 0, 0, 0, 0 ],
     [ 0, 0, 1, 0 ],
     [ 0, 0, 0, 1 ] ]
   NArray.int(2):
   [ 7, 12 ]
   NArray.byte(4,3):
   [ [ 0, 0, 0, 0 ],
     [ 0, 0, 1, 1 ],
     [ 1, 1, 1, 1 ] ]
   NArray.int(6):
   [ 7, 8, 9, 10, 11, 12 ]


and so much more.  it's all on rubyforge.

-a
-- 
suffering increases your inner strength.  also, the wishing for suffering
makes the suffering disappear.
- h.h. the 14th dali lama