alex.mizrahi's articles:

Items(11) /2 Next >> Last >|

video compression idea 16 46 (6/29/2012 10:35:13 AM) comp.compression Break all video frames into blocks, say, 4x4 ones, as usual. Run a clustering on those blocks (lots of them!) using, say, Frobenius norm for distance. Find mean or median for each such cluster. For eac... Alex

generic files + persistent binary search trees 12 21 (5/29/2012 10:34:24 AM) comp.lang.lisp Hi Here is an implementation of CLOS-based file abstraction and an example of its use to implement persistent binary search trees: https://gist.github.com/2823562 I've implemented this in a couple of... Alex

[ANN] nodeweb 0 19 (4/22/2012 3:48:18 PM) comp.lang.lisp Nodeweb is a (not yet released) lightweight, flexible web framework on top of the Hunchentoot web server. It aims for the niche between Hunchentoot's easy-handler framework (which is very simple) and more co... Alex

non-deterministic evaluation order 13 16 (3/21/2012 7:47:21 AM) comp.lang.lisp Were there any Lisp-like languages with non-deterministic evaluation order? (Well, I'm interested in non-lisp ones too.) I'm aware of Screamer, but it's different kind of non-determinism: basically, a syntac... Alex

Elephant, the persistent object database 3 45 (9/9/2011 10:45:51 AM) comp.lang.lisp hi I'm currently working on improvements/fixes for Elephant, the persistent object database. http://common-lisp.net/project/elephant/ In its current state it works (i.e. passes all internal tests) on SBCL +... Alex

compressing a sequence of number 0 29 (7/13/2011 3:04:52 PM) comp.compression This was my first post to this group about a year ago and I'm still looking for an answer... But this time I already have something viable for a model and I need to implement the last step: write decorrelate... Captain

linear least squares 1 31 (7/12/2011 10:34:18 PM) comp.compression It is a math question, but I guess some people here know how linear least squares work, so I'll take a chance. Linear least squares minimizes difference ||y - X * b||^2 where X is matrix with 'observations', ... Captain

how about this? (KLT for sound compression again...) 3 23 (7/7/2011 12:30:12 PM) comp.compression Here's an idea of how to combine linear prediction with KLT: 1. Let's say signal is chopped into non-overlapping blocks of samples. 2. We attempt to predict contents of next block using current block. This... Captain

Is this how MDCT works? 11 31 (6/26/2011 11:54:08 AM) comp.compression I just had an idea how to use arbitrary transform in a overlapped fashion like MDCT. (Probably it is nothing new, as it is pretty much trivial.) Let's say we have an orthonormal transform T which transforms ... Captain

finalize-inheritance and redefinition 13 19 (5/10/2011 6:11:15 AM) comp.lang.lisp Let's say I want to do something with class after all effective slot definitions are instantiated. (E.g. let's say one ESD affects another and I want to update them when I have them all.) It looks like a goo... Captain

alex.mizrahi's replies:

Items(95) /10 Next >> Last >|

tail call with memory 18 22 (4/25/2012 9:22:02 AM) comp.lang.lisp Hello, I do not understand how I managed to build in some limited memory into the following function. (let ((lst)) (defun search-all-1 (a b &key (test #'equal)) (labels ((f (a b acc) (let ((x ... feldspat (10)

PCL chapter 3 -- (load file) error 9 22 (4/25/2012 12:16:42 PM) comp.lang.lisp Getting unbound-variable error while loading file. Error disappears if I am calling function add-record() at the end of file. I used to think that after file is compiled successfully then it does not matter ... sunrise2 (598)

package surgery library? 6 23 (4/25/2012 3:50:10 PM) comp.lang.lisp Hi, I just wrote the following routine to remove all symbols from a package: (defun unintern-package-symbols (package) "Unintern symbols defined by PACKAGE" (let* ((external-symbols (remove-duplicates ... mirko.vukovic (404)

Learning Lisp #5 118 53 (5/7/2012 10:44:45 AM) comp.lang.lisp Recently started learning lisp, firstly, I have to admit I really do love all the paranthesis. But there are other features of my old language that I do miss. Is lisp frequently used to develop web pages, if s... photonpackets (1)

OT: How to calculate reputation scores? 16 20 (5/22/2012 4:51:49 PM) comp.lang.lisp General question (not LISP related): Many web sites have an article/message/user reputation based on the up or down votes the article/message/user receives. How is a reputation score calculated given only up a... mikee2856 (42)

generic files + persistent binary search trees 12 21 (5/29/2012 10:34:24 AM) comp.lang.lisp Hi Here is an implementation of CLOS-based file abstraction and an example of its use to implement persistent binary search trees: https://gist.github.com/2823562 I've implemented this in a couple of... alex.mizrahi (227)

LISP style question - (with-open-file) 14 30 (5/29/2012 2:59:55 PM) comp.lang.lisp I've read that a C programmer will write LISP as C. as i recall that is attributed to Paul Graham. I seem to be in that category (except I'm using Perl). I can't figure out what a proper style for LISP is (o... cartercc (420)

clisp, ext:shell, Windows XP and 7 2 44 (5/29/2012 8:17:28 PM) comp.lang.lisp Below is the post that I had written but had not posted. Before I submitted the post, I decided to give it one last try. I hit on a solution (after several hours) and I'm passing it along both because it may... cartercc (420)

newbie question on dynamic scope 21 21 (6/9/2012 6:14:06 PM) comp.lang.lisp I'm learning Lisp and am reading Paul Graham's book on ANSI Common Lisp and using LispWorks Personal edition for testing. He gives a simple example of creating a variable in lexical scope: (let ((x 10)) ... lwoj.sjuwklim (7)

video compression idea 16 46 (6/29/2012 10:35:13 AM) comp.compression Break all video frames into blocks, say, 4x4 ones, as usual. Run a clustering on those blocks (lots of them!) using, say, Frobenius norm for distance. Find mean or median for each such cluster. For eac... alex.mizrahi (227)