pretty much the same as the rosettacode solution, but focused on an internal
representation rather than outputting a string
torle =: (1 ,~ 2&(~:/\)) ({. , #);.2 ]
frle =: ([: ; <@#~/"1) :.torle
----- Original Message -----
From: Raul Miller <[email protected]>
To: Programming forum <[email protected]>
Cc:
Sent: Monday, June 29, 2015 12:04 PM
Subject: Re: [Jprogramming] integer run length compression
Perhaps http://rosettacode.org/wiki/Run-length_encoding#J
Thanks,
--
Raul
On Mon, Jun 29, 2015 at 11:55 AM, John Baker <[email protected]> wrote:
> I vaguely remember reading forum traffic sometime ago about a simple
> J based run length encoding verb for integers.
>
> eg:
>
> If you have list of integers with many runs of the same value.
>
> 0 0 0 0 0 0 2 4 4 4 4 2 0 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 0 2
> 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>
> What's a good way to compress, and decompress, this using only J?
>
> Just thought I would ask before rolling my own.
>
> --
> John D. Baker
> [email protected]
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
