Jump to content

Talk:X-machine

Page contents not supported in other languages.
From Wikipedia, the free encyclopedia

Untitled

[edit]

Many thanks to whoever created this page - it was a great idea. Since my last edits a few months ago, I've been planning pages for the SXM and the SXM testing methodology, but time has been limited. If anyone can contribute to those pages as well, please do!

  1. I've now added a lot more detail, and included loads more references, and several more variants.
  2. Confusingly, there are two similar sounding parallel models: the CXM and CSXM. I've been trying to work out which one came first, but am rapidly coming to the conclusion that they were simply developed independently at essentially the same time (1994/5)
  3. The current description in this article only considers XMs that compute relations from X to X. However, by adding encoders and decoders they can be used to compute relations of type Y -> Z, for any Y and Z. This is part of the standard description, so it ought to be added. Would adding it in the example be enough?
  4. The computational power of XMs is quite subtle. Given any relation R: Y -> Z at all, there's an XM (with encoder/decoder) that computes it. I'd like to add a para discussing the meaning of this result.

Mike.stannett (talk) 22:51, 21 March 2008 (UTC)[reply]

I had a think about some of the above issues and have now expanded the discussion of Eilenberg's original X-machine model to include the encoders and decoders, as requested. Unfortunately, the example is not obviously a case of the most general kind of X-machine, but rather appears to accept keyboard keystroke inputs (like a Stream X-Machine), so I'm going to have to think about another example.

AJHSimons (talk) 14:35, 28 March 2008 (UTC)[reply]

So, I have now done what I suggested above. I have included a different example, which more obviously has an encoding and decoding stage, with the general X-machine running to completion and applying relations to X. The example is a keyhole optimizer, which performs several transformations upon the memory datatype X (a parse tree). I hope everyone likes this! I think it more accurately exemplifies Eilenberg's original machine. Of course, the word processor example could be used later to illustrate a Stream X-Machine.

AJHSimons (talk) 15:24, 29 March 2008 (UTC)[reply]

Good call - the example I originally included was decidedly trivial, whereas yours shows much more clearly how the processing works, and how X-machines can be used to describe real (and relevant) behaviours. Great to see all your extra info as well!

Mike.stannett (talk) 02:12, 31 March 2008 (UTC)[reply]

[edit]

Harold MacIntosh wrote a set of specialized languages in a Rec language, maybe by the late 60s or 70s. I do not know that language set in depth, only a glance on some articles which now should be available to download. That system consisted in several specialized languages. The idea seems similar to this machine. Maybe someone with a deep understanding of the X-Machine, could take a look on REC to extend this article, if both are similar. — Preceding unsigned comment added by 189.178.36.45 (talk) 09:00, 9 December 2014 (UTC)[reply]

[edit]

Hello fellow Wikipedians,

I have just modified 2 external links on X-machine. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}).

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 13:28, 21 July 2016 (UTC)[reply]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Talk:X-machine&oldid=1249986945"