Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!rutgers!seismo!columbia!garfield.columbia.edu!metzger From: metzger@garfield.columbia.edu.UUCP Newsgroups: sci.crypt,comp.sys.ibm.pc,comp.sources.wanted Subject: Re: Need information on data compression algorithms Message-ID: <4550@columbia.UUCP> Date: Thu, 16-Apr-87 10:59:56 EST Article-I.D.: columbia.4550 Posted: Thu Apr 16 10:59:56 1987 Date-Received: Fri, 17-Apr-87 05:43:37 EST References: <528@savax.UUCP> <635@ttidca.UUCP> <4542@columbia.UUCP> <1323@ihdev.ATT.COM> Sender: nobody@columbia.UUCP Reply-To: metzger@garfield.columbia.edu.UUCP (Perry Metzger) Organization: Columbia University CS Department Lines: 20 Xref: utgpu sci.crypt:312 comp.sys.ibm.pc:2950 comp.sources.wanted:887 In article <1323@ihdev.ATT.COM> pdg@ihdev.UUCP (Joe Isuzu) writes: >Unless you take symbolic representation into account. Say you >numbered the (2^14)-1 words, and used that to replace just the >absolute matches (forgetting about endings etc), you would already be >elimintating more than you claim, before even implementing redundancy >techniques. If you read a little more on the subject, you would >realize there is more than one way to skin a cat. Sorry, you still lose. If you do that, you are not compressing an ARBITRARY text that much. For instance, if I have 256 books in my library, and each one of them contains say a million words (I know that is big) you can then compress any book in the library down to 8 bits, provided that you know that the text you are transmitting is in the library. But then, you see, you are not compressing an ARBITRARY text, only a text you can find in that limited library. If I pick completely random text I can't do that. Enough of this. .pm