Pd-list November 2005

pd-list@lists.iem.at

143 participants
298 discussions

cdf---oops
by pete mcpartlan 09 Nov '05

09 Nov '05

oops forgot to attatch the patch... pete -- ~~~~~~~~~~~~~~~~~~~~~~~~~ www.140worthing.karoo.net =-=-=-=-=-=-=-=-=-=-=-=-= #N canvas 3 24 689 453 10; #X obj 46 56 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 30 135 moses 20; #X obj 93 135 moses 36; #X obj 153 135 moses 44; #X obj 213 135 moses 52; #X obj 273 135 moses 60; #X obj 333 135 moses 68; #X obj 393 135 moses 74; #X obj 453 135 moses 78; #X obj 513 135 moses 80; #X obj 573 135 moses 82; #X floatatom 36 174 5 0 0 0 - - -; #X floatatom 93 177 5 0 0 0 - - -; #X floatatom 174 176 5 0 0 0 - - -; #X floatatom 335 180 5 0 0 0 - - -; #X floatatom 387 179 5 0 0 0 - - -; #X floatatom 426 177 5 0 0 0 - - -; #X floatatom 482 177 5 0 0 0 - - -; #X floatatom 562 177 5 0 0 0 - - -; #X floatatom 642 177 5 0 0 0 - - -; #X floatatom 295 185 5 0 0 0 - - -; #X floatatom 697 177 5 0 0 0 - - -; #X obj 41 6 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1; #X obj 144 210 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 38 215 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 192 212 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 303 224 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 358 218 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 402 218 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 430 219 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 490 222 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 557 219 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 653 216 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 697 216 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 41 26 metro 500; #X obj 178 14 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 177 34 tabdump bananas; #X obj 176 57 unpack f f f f f f f f f f; #N canvas 0 0 450 300 graph4 0; #X array bananas 11 float 1; #A 0 1.00704 1.00704 1.50704 3.00704 9.00704 20.007 44.007 56.007 63.007 66.007 67.007; #X coords 0 70 10 0 200 140 1; #X restore 104 268 graph; #X obj 33 103 random 70; #X connect 0 0 39 0; #X connect 1 0 11 0; #X connect 1 1 2 0; #X connect 2 0 12 0; #X connect 2 1 3 0; #X connect 3 0 13 0; #X connect 3 1 4 0; #X connect 4 0 20 0; #X connect 4 1 5 0; #X connect 5 0 14 0; #X connect 5 1 6 0; #X connect 6 0 15 0; #X connect 6 1 7 0; #X connect 7 0 16 0; #X connect 7 1 8 0; #X connect 8 0 17 0; #X connect 8 1 9 0; #X connect 9 0 18 0; #X connect 9 1 10 0; #X connect 10 0 19 0; #X connect 10 1 21 0; #X connect 11 0 24 0; #X connect 12 0 23 0; #X connect 13 0 25 0; #X connect 14 0 27 0; #X connect 15 0 28 0; #X connect 16 0 29 0; #X connect 17 0 30 0; #X connect 18 0 31 0; #X connect 19 0 32 0; #X connect 20 0 26 0; #X connect 21 0 33 0; #X connect 22 0 34 0; #X connect 34 0 0 0; #X connect 34 0 35 0; #X connect 35 0 36 0; #X connect 36 0 37 0; #X connect 37 0 1 1; #X connect 37 1 2 1; #X connect 37 2 3 1; #X connect 37 3 4 1; #X connect 37 4 5 1; #X connect 37 5 6 1; #X connect 37 6 7 1; #X connect 37 7 8 1; #X connect 37 8 9 1; #X connect 37 9 10 1; #X connect 39 0 1 0;

1 0

clearing a subpatch on exit?
by Chuckk Hubbard 08 Nov '05

08 Nov '05

I still have the same problem with my presets- the subpatch wherein I write them saves its contents, which include a 12,000-element array per preset, and when I reopen my main patch, PD doesn't read the whole thing. It doesn't reach the length I've been told PD patches can be, but somehow it doesn't read to the end of the patch, and none of the connections on the main page show up, among other things. If I open in a text editor and delete all the scalars in that canvas, it works fine. Is it possible to execute a command when a window closes? Say, to send ";pd-presetmemory clear" when JI.pd is told to close? I tried [loadbang]---[;pd-presetmemory clear( but, even though that command showed up before the presetmemory canvas in the file, it never reaches that point on load. I have a button for manually clearing pd presetmemory, but I don't always hit it before I close. Thanks. -Chuckk -- "It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters." -Friedrich Nietzsche, "Thus Spoke Zarathustra"

2 1

pool disappears
by Gerda Strobl 08 Nov '05

08 Nov '05

Dear list, hallo Thomas just installed new version of pool-(using pd-0.39-1test1) my pd is telling me: pool 0.2.2pre - hierarchical storage object, (C)2002-2005 Thomas Grill When i open new file -new object-I write in "pool"-as soon as I click next to the object -the whole object is disappearing. but saving the patch shows me in the text file that the object is there. But on the other side I can open pool-help.pd--and pool is visible--but copying from there to the empty patch doesnt work. This doesn't happen with pd 0.38-4-(there it works perfect)--is this magic disapperance because of pd-0.39? thx Gerda

3 6

pyext + pygresql vs sqlsingle
by Jamie Bullock 08 Nov '05

08 Nov '05

Dear list, I need to insert around 5 sets of 40 values, per second from PD into a postgresql database (both on the same machine). I can see two options - pyext + pygresql or sqlsingle. >From a brief glance at both it looks like the Python route would be better because sqlsingle introduces a lot of overhead opening and closing the connection, and vacuuming the db between writes. However, perhaps sqlsingle could handle the task on a modern machine (Centrino 1.6GHz)? This would probably save me some time getting the Python stuff working? Does anyone have any advice either way before I start with this? -- Regards, Jamie

3 3

flext glibc double free or corruption
by Johannes Burström 08 Nov '05

08 Nov '05

Hi after updating my debian installation (including 1ibc6) i suddenly started to have problems with pool. i have narrowed it down to this: closing pd after invoking [pool] in a patch, IF the xsample library is loaded, makes pd crash with the following message: *** glibc detected *** double free or corruption (fasttop): 0x082d8ea8 *** Sometimes this happens when just deleting an abstraction containing [pool]. I haven't been able to find a way to reproduce this, however. the bt of gdb shows this: 0x40417861 in kill () from /lib/libc.so.6 (gdb) bt #0 0x40417861 in kill () from /lib/libc.so.6 #1 0x402b4309 in pthread_kill () from /lib/libpthread.so.0 #2 0x402b46c0 in raise () from /lib/libpthread.so.0 #3 0x40417616 in raise () from /lib/libc.so.6 #4 0x40418981 in abort () from /lib/libc.so.6 #5 0x4044a960 in __fsetlocking () from /lib/libc.so.6 #6 0x404502e9 in malloc_usable_size () from /lib/libc.so.6 #7 0x40450d81 in free () from /lib/libc.so.6 #8 0x4061e9d8 in flext_root_single::operator delete () from /usr/local/lib/pd/extra/xsample.pd_linux #9 0x4061bfaf in flext_base_single::AddOutlets () from /usr/local/lib/pd/extra/xsample.pd_linux #10 0x40419ade in exit () from /lib/libc.so.6 #11 0x4040441b in __libc_start_main () from /lib/libc.so.6 #12 0x08059261 in _start () at ../sysdeps/i386/elf/start.S:119 this is on devel 0_39, checked out today, and a recent (i believe yesterday) flext checkout, all compiled today. If related somehow, the libc6 is 2.3.5-7, from unstable, the testing 2.3.5-6 had the same problem, while i didn't have this issue with 2.3.2.ds1-22 (_if_ it's related - if this will continue i guess i'll try to downgrade to see if it disappears). i'd be grateful if anyone had any clues on how to solve this. Johannes

5 14

basic DSP stuff
by Chuckk Hubbard 08 Nov '05

08 Nov '05

I understand complex numbers used to represent rotation, so as to encode frequency in an easy to manipulate form, and I understand that the imaginary part can be disposed of when converting back to real signals and nothing is changed, but there's one bit that is hanging me up: Using i is just a convention, a way to keep from mixing the two numbers. The square root of -1 is not really involved in any of it, because it doesn't exist. So why, when you multiply Z1 and Z2, do i*sin(a) and i*sin(b) multiply to -sin(a)sin(b)? Also, the decision (this is coming from Miller's "Theory and Techniques") to multiply the complex constant A by the unit-value complex number Zn; this is convenient, but it seems rigged. Instead of letting Z have whatever amplitude it really has, in which case multiplying it (which already seems forced) by itself changes its amplitude, you force it to be 1 and add on the amplitude later. Nothing violated, but it seems artificial, like we fudge the numbers to make it come out right. If it is artificial, and just a way of simplifying sinusoid manipulation, then why even use artificial mathematical operations to explain it? I already tried just moving ahead accepting these, but eventually something always throws me. One more question... regarding how filters work, is there no intuitive way to express it? No shortcut so that rpole~ and rzero~ will at least make sense in theory before I push through all the math? -Chuckk -- "It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters." -Friedrich Nietzsche, "Thus Spoke Zarathustra"

5 7

Re: [PD] basic DSP stuff
by Chuckk Hubbard 08 Nov '05

08 Nov '05

Oops, responded without changing the subject: No sweat. I guess I could elaborate on the specific fudging I see: When multiplying Z1 and Z2, you take r1*r2*(cos x + i sin x)(cos y + i sin y) = r1r2((cos x cos y) + i(cos x sin y) + i(cos y sin x) + i*i*(sin x sin y)) = r1r2((cos x cos y) - (sin x sin y) + i((cos x sin y) + cos y sin x))) (there's where I see the fudging, in making the sines negative) = r1r2(cos (x+y) + i sin (x+y)) Now I'm seeing something. Ah ha. (cos x cos y) = (-cos x * cos y) = -(cos x cos y) and -(cos x cos y) + (sin x sin y) = -(cos(x+y)) = cos (x+y) So the negative is a red herring since cosine is an even function? (I use x and y not as polar terms, but because I have no theta key) Crazy. I wonder if that's right. I wasn't thinking philosophically, but turning an imaginary number into a real number seems questionable when the only reason for using an imaginary number is to keep it separated from its real counterpart. The fact that i^2 = -1 has no bearing on a + ib alone. I'm not very educated- I'm a composition major at a jazz school- but I've spent some time with a couple books on the subject. -Chuckk -- "It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters." -Friedrich Nietzsche, "Thus Spoke Zarathustra" Date: Mon, 07 Nov 2005 23:47:58 +0100 From: Piotr Majdak < piotr(a)majdak.com> Subject: Re: [PD] basic DSP stuff Cc: pd-list(a)iem.at Message-ID: <436FD99E.7000504(a)majdak.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Chuckk Hubbard wrote: > Not that I don't appreciate the snide commentary, but this is why I'm > asking. If I offended you, please forgive me. You asked a simple question and I tried to answer, as simple as possible (I don't know your level of education). Back to your question, you asked: > So why, when you multiply Z1 and Z2, do i*sin(a) and i*sin(b) multiply to -sin(a)sin(b)? You see, you wrote an "i" there. If you define "i" by "sqrt(-1)" (I admit I was implying that), then my answer: i*sin(a) * i*sin(b) = -1 * sin(a)*sin(b) is correct. And, as you see, "i" is there :-) But, if you wanted to discuss the fact, that "i" has no physical meaning - in this case I misunderstood your question. This is complete another issue, much more philosophical than mathematical and thus outside my education focus. br, Piotr

2 1

announce: PHP package Net_DataFlow
by Alexandre Quessy 08 Nov '05

08 Nov '05

Hi list, I just released an alpha version of my set of PHP classes to create message handlers for PD. It only work on *NIX systems. To install just type the following line: pear install http://www.sourcelibre.com/puredata/Net_DataFlow-0.1.0.tgz If you don't have a working PEAR, install it this way (as root or not, depending on the location you want to install it). curl http://pear.php.net/go-pear | php -q More informations at http://www.sourcelibre.com/puredata/ and, of course, http://pear.php.net ! An example is at http://www.sourcelibre.com/puredata/Example2.php Please let me know if your project uses this software. It is LGPL. +-------------------------------+--------------------------------------+ | Alexandre Quessy @ Montréal | http://www.sourcelibre.com/puredata/ | +-------------------------------+--------------------------------------+

1 0

getting the name of the current or parent patch
by Hans-Christoph Steiner 08 Nov '05

08 Nov '05

hc: so I am building a PowerPoint for Pd, since I do talks and workshops about Pd, so I want to not have to switch back and forth between apps. Currently I need someway to get the name of the current patch, or the parent patch, either one Any ideas? .hc ________________________________________________________________________ ____ There is no way to peace, peace is the way. -A.J. Muste

2 2

targetting a specific abstraction for "vis 1"
by Mike Wozniewski 08 Nov '05

08 Nov '05

Hi all, I have many instances of an abstraction on my patch (each with different arguments - guaranteed)... eg: [abstraction 1] [abstraction 2] [abstraction 3] ... I would like to send a "vis 1" message to *just one* of the abstractions. But I have only figured out how to open *all* of them with a message like: ; pd-abstraction.pd vis 1 Does anyone have an idea of how to target just one? I know that each abstraction will have a unique $0 ...but how do I know what the value of $0 is from the parent patcher level? ...and even if I did know the $0, what do I send my "vis 1" message to? ...$0-pd-abstraction.pd doesn't work. Thanks a ton! -Mike Wozniewski

4 3

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Pd-list November 2005