null program comments

BLANKENSHIPJOLENE34 (Unsharp Masking)

Thu Mar 11 21:09:33 2010

It is known that cash makes us disembarrass. But what to do if one has no money? The one way is to receive the credit loans or student loan.

Chris Wellons (Elisp Running Time Macro)

Mon Mar 8 20:43:50 2010

I've realized that this function could be a lot shorter, cleaner, and more correct just by using float-time. So I fixed it. Enjoy!

Gavin Black (Function Pointers are Special)

Thu Feb 18 19:22:10 2010

Finally something to replace giving printouts of Whitespace programs to interviewees and asking them to debug it :-D

Chris Wellons (Wisp Lisp)

Mon Jan 25 11:54:53 2010

Hmmm, that can only mean that something is passing a size of 0 to realloc() at some point. It returned NULL and it was thought to be an error.

That's the kind of stuff I'm working on ironing out right now. The number of defined functions will expand once I have the core pretty solid. I look forward to the point where I'm just adding interesting language features, exposing interesting library interfaces, and optimizing things.

I'm also nearing the point where I can start benchmarking its performance. Right now it seems to be on par with non-compiled Emacs lisp. However, I have the advantage of much fewer language features.

Gavin Black (Wisp Lisp)

Mon Jan 25 06:39:25 2010

Seems to be working for me, I just tried a few little programs (fibonacci, hello world, etc.)
It can crash pretty spectacularly if you try something that's not defined though.
For example I tried using "or" and got:
��"error: fatal: out of memory: Success"

Ozgur (SWF Decompression Perl One-liner)

Mon Dec 28 23:27:37 2009

For completeness sake, let me also add the "php one liner" version of this tip here:

php -r "print(gzuncompress(substr(file_get_contents($argv[1]), 8)));" swf_original.swf > swf_decompressed.swf

Disclaimers: - Tried this on Windows version of php 5.2.6 (I know some command line parameters/syntax are different b/w Linux, and Windows) - Assumes "zlib" module is "compiled in" which was the case in my binary distribution.

BTW, the reasons I tried this were: - As I said in my first comment, you may have certain tools (php) but not others (perl) - When I tried the original perl one-liner for a particular flash file, [I think] the Perl ZLib module choked, and did not produce any output (I had version 1.34 from 30 January 2005 - newer versions might fare better).

�zg�r

Chris Wellons (SWF Decompression Perl One-liner)

Wed Dec 23 17:21:40 2009

Ah, I see. I didn't notice it before. Thanks for pointing it out. Glad you found your way to the non-damaged version!

Ozgur (SWF Decompression Perl One-liner)

Tue Dec 22 12:58:33 2009

This is a pretty neat trick, especially if one (has Perl already available and) doesn't want to (or even can't in a particular set up) install utilities to this job.

I found your page from the comment you posted on that Java program's page initially. The problem there however was that the less-than/greater-than symbols were lost in that page's comment system (as HTML tag delimiters I guess), and the one-liner displayed there doesn't work "as is" of course. You may want to drop another comment there so that your neat one-liner there doesn't frustrate people who can't fix it right away! :)

Thanks,

Ozgur

Gavin Black (Game of Life in Java)

Tue Dec 15 11:10:13 2009

Another way to do it, instead of classes, would have been through something similar to Wolfram automata definitions, and have the rules correspond to count.

For example basic Conway Automata could be done by representing the new state as the array:
[0, 0, 0, 1, 0, 0, 0, 0, 0,
�0, 0, 1, 1, 0, 0, 0, 0, 0 ]

Similarly the growth one could be:
[0, 0, 0, 1, 0, 0, 0, 0, 0
�0, 0, 2, 2, 0, 0, 0, 0, 0,
�1, 1, 3, 3, 1, 1, 1, 1, 1,
�2, 2, 3, 3, 2, 2, 2, 2, 2 ]

Then:
�let s = current_state
�let n = alive_neighbors
�=> new_state = set[ s*8 +n ];

The only nice thing about this is you can dynamically modify how they behave without writing new code for each cell type. This is how the Wolfram Automata I toyed with a while back worked, it modified the ruleset based on the Fast Fourier Transform averages of the audio.

Gavin Black (Iterated Prisoner's Dilemma)

Sun Dec 13 15:44:23 2009

Very cool! I haven't looked through your old posts before, looks like there is alot of neat code. After the semester is over I'll have to try to run some of these :)

Safy (Linear Spatial Filters with GNU Octave)

Sat Dec 12 19:50:44 2009

Thnx for the reply

i will work on it

Chris Wellons (Linear Spatial Filters with GNU Octave)

Sat Dec 12 12:00:31 2009

Glad you enjoyed it.

Octave/Matlab won't magically pad your array for you when you're indexing it. You have to check, in your loops, if the index is outside the bounds of the array, and if so, substitute 0 (for zero padding). Or you could modify the array to add the padding beforehand, and only convolve on the middle; the padarray function I had mentioned can do this for you.

Safy (Linear Spatial Filters with GNU Octave)

Sat Dec 12 09:00:04 2009

Hello,

this is a very nice explanation for applying Mask Filter in spatial domain,

i am making a same program for applying average filter(blur) but i am using 2 FOR loops to apply the mask pixel by pixel. i am having a problem in zero padding, i am using 3x3 mask, when the mask tries to convolve outside the boundry of input image then matlab gives error that "Subscript Indices Must Either Be Real Positive Integers Or Logicals'

i wuould be very thankfull if u help me with this or send me coding of a working sample program

Regards, Sh.Safy

Gavin Black (Tweaking Emacs for Ant and Java)

Tue Dec 8 04:57:37 2009

A very similar effect can be achieved with a real editor using ant_menu.vim plugin. You simply copy it to $VIM_HOME/plugins and then: ,b to build; ,f to find; ,t to build a target; etc. All of which go into a separate buffer on a split screen.

You can run the program using :!whatever_command. Or if you want to be fancy and run it in it's own buffer you could do :e name then :%!whatever_command.

Chris Wellons (Comments Upgrade with Avatars)

Mon Dec 7 14:23:54 2009

I actually swiped that image right from Wikipedia, which is indicated, as required, by mousing over the image to see the image's title attribute. Thanks to the Free licensing Wikipedia uses I can do this without risking some kind of Fair Use/copyright infringement thing.