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Ruz Kut

I've managed to translate the ascending insert-sort algorithm into GenExpr, but there are issues to be solved.

Mainly, it seems like it always miss some values, resulting in a semi-sorted buffer... ?

Do you think is a problem related to signed floating values ?

Is there a way to create an integer variable (not a constant) in GenExpr so the for-loops are more precise ?

I've also tried with [data] before with the same code, but It always gives me weird errors (gen~ kernel, unable to compile, etc...)

btw I'm doing this in order to modify the gen-chopper-repeat patch so that I can play grains by reading an index sorted by RMS values, so of course the more precise is the sorting the better. (the concept is that of grain-tagging, something like CataRT by IRCAM).

Hi all !
I'm no expert in code whatsoever
BUT
I've managed to translate the ascending insert-sort algorithm into GenExpr, but there are issues to be solved.
Mainly, it seems like it always miss some values, resulting in a semi-sorted buffer... ?

Do you think is a problem related to signed floating values ?
Is there a way to create an integer variable (not a constant) in GenExpr so the for-loops are more precise ?
I've also tried with [data] before with the same code, but It always gives me weird errors (gen~ kernel, unable to compile, etc...)

btw I'm doing this in order to modify the gen-chopper-repeat patch so that I can play grains by reading an index sorted by RMS values, so of course the more precise is the sorting the better. (the concept is that of grain-tagging, something like CataRT by IRCAM).


insert-sort-of-a-buffer-in-gen-codebox

Forgot to link my reference for insert-sorting
http://mathbits.com/MathBits/CompSci/Arrays/Insertion.htm

If only someone fluent with codebox could give my patch a look I'd appreciate it :)


I noticed one thing though, if you try and work with longer buffers the sorting contains less samples than the input. 

Yes -- the Max console hints at why: "gen~: audio processing exception: Too many iterations (runaway loop?)"

For safety, gen~ forces a limit on how many loop iterations can happen on each vector -- this limit is currently defined as 100000 * vector size. The reason for doing this is that too many iterations can cause an audio dropout, and infinite iterations will lock up the entire audio thread (possibly crashing it). Per Turing, there's no way to know in advance if a given piece of code will loop forever, so we work around this by having the loop iteration limit and bailing out of audio processing when this limit is reached -- and printing the warning to the Max console.

Although the buffer size in your patcher is 44100 samples long, and thus less than the loop limit, the insert-sort algorithm can cause millions of iterations due to the nested loop. This really is too many to process within one signal vector, and would cause audio dropouts. 

To process millions of samples in gen~, the solution is to distribute processing over time. Sadly there's not an easy way to convert the code to do this -- but after a bit of manual work, here it is working. What I found interesting in this is that the semantics of the code became a bit more obvious:

Note that if you want it to sort faster, you can wrap that final if() block in a for loop, but this will increase the CPU load:

Another option is to process the insertion sort via some non-gen~ solution. If you still want to use GenExpr, you could actually achieve it via jit.gen and jit.buffer~, but I don't think insertion sort is the best sorting algorithm to use, as it can't take advantage of the parallelism of cell-based processing. sample-sort, quick-sort, aa-sort etc. might work better.

Thanks for those examples - fascinating and illuminating! 

insert-sort of a buffer in gen codebox ?

Lionel

i've just noticed something weird when using more than one delay in a gen~ patcher (see the example below)

 With a feedback value of 1, there should be no decay but this is only the case for the first delay, not the second one... unless the delay times are multiples of each other !

Is this a bug or am i doing something wrong ?

Hi 

i've just noticed something weird when using more than one delay in a gen~ patcher (see the example below)

 With a feedback value of...

weird-delay-behavior-in-gen

Weird delay behavior in gen~

Recall the Coll

Hello, I was wondering if there is a way to normalize in gen~, like the normalize~ object works.

normalize-in-gen-like-the-normalize-object

Normalize in gen~ like the normalize~ object

ojse_no

So a little while ago i read something about using buffer~ to store a list and then reading it from inside gen~, and now im trying to find more information as to how i could implement this, my goal is to build a delay circuit whose time is changed every time the input passes a certain threshold, i made a list of the numbers i want to use as time but am unsure as how to proceed so as to be able to store the list in the buffer~ , and then everytime the audio input signal goes above a certain threshold a number from the list is chosen at random then this number is used as the value for the delay time. 

So a little while ago i read something about using buffer~ to store a list and then reading it from inside gen~, and now im trying to find...

lists-inside-gen

Lists inside gen~? 

sgblm

Just wanted to ask, when using send/receive locally in a gen patch, is it compiled the same as if patch cables were used, i.e. no increased latency?

I like using lots of sends/receives to keep patches looking tidy but I don't want it affecting performance.

Hi,

Just wanted to ask, when using send/receive locally in a gen patch, is it compiled the same as if patch cables were used, i.e. no...

gen-sendreceive-latency

Gen Send/Receive Latency

Steve Horne

I have published part 2 of my 2-parter video about how to use signals to control timing in Max/MSP:

timing-with-phasor-and-gen

Timing with phasor~ and gen~

Stone

I have a gen~ patch that contains several copies of a gen abstraction, which is a bank of codebox filters in series, and the abstractions sum together before they are output into the MSP world. I can have three copies of the abstraction in a gen~ patch with no problem, but when I add a fourth I get an error message;

“gen_domain: dsp.gen: [string "gen2.Module"]:151: invalid replacement value (a nil)”. I presume this means I have one of the filters throwing 

If I’m on the right track then the rest of the message should tell me where this is happening. Can anyone help me decode the message? I have been using Gen for a while but this is new to me.

I have a gen~ patch that contains several copies of a gen abstraction, which is a bank of codebox filters in series, and the abstractions sum together before they are output into the MSP world. I can have three copies of the abstraction in a gen~ patch with no problem, but when I add a fourth I get an error message; 

“gen_domain: dsp.gen: [string "gen2.Module"]:151: invalid replacement value (a nil)”. I presume this means I have one of the filters throwing nan.  I have a bunch of filters.

Hello,
I have a gen~ patch that contains several copies of a gen abstraction, which is a bank of codebox filters in series, and the abstract

error-gen_domain-dsp-gen-string-"gen2-module"-151-invalid-replacement-value-a-nil

Error - gen_domain: dsp.gen: [string "gen2.Module"]:151: invalid replacement value (a nil)

Reilly Shellito

I'm rather new to programming, and I've been testing out making an additive synth with codebox in gen~. To generate all of the partials, I figured it would be best to use a for loop to call a function for each partial at their respective frequencies and amplitudes. It sounds really crazy  when I do that, it seems like it gives me one sine wave at a really high frequency. 

When I call a function for each partial individually and add and assign at the output (like out += sine1, 2, 3...) it works fine.

the codebox in the parent patch is just a reference of a patch that uses a for loop to generate grains in a granular synth

I'm rather new to programming, and I've been testing out making an additive synth with codebox in gen~. To generate all of the partials, I...

why-wont-the-for-loop-do-what-i-want-it-to

Why won't the for loop do what I want it to?

Eren Utku

In the following forum post, I found a Schroeder Reverb written completely in genExpr:

https://cycling74.com/forums/best-practices-converting-large-gen-patches-to-genexpr-codebox-code#reply-5fdd49a17fd00008d13ab203

and I saw that the allpass filters and comb filters are described in the following way:

	ap1 = allpass(sig, 0.7, 347 * size);
	ap2 = allpass(ap1, 0.7, 113 * size);
	ap3 = allpass(ap2, 0.7, 37  * size);

	fc1 = fbcomb(ap3, 0.773, 1687);
	fc2 = fbcomb(ap3, 0.802, 1601);
	fc3 = fbcomb(ap3, 0.753, 2053);
	fc4 = fbcomb(ap3, 0.733, 2251);

I see this kind of approach in all genExpr codes. But can't we write this something similar to this? (ignore vec since it doesn't work in gen dsp apparently, take it as a pseudo-code):

dtimes_AP = vec(347, 113, 37);
gains_Comb = vec(0.773, 0.802, 0.753, 0.733);
dtimes_Comb = vec(1687, 1601, 2053, 2251);
fc = vec();

for(i=0; i<=2; i+=1) {
	sig = allpass(sig, 0.7, dtimes_AP(i) * size);
}
	
for(i=0; i<=3; i+=1) {
	fc(i) = fbcomb(sig, gains_Comb(i), dtimes_Comb(i));
}

In addition,  array structures are not available on genExpr. Doesn't this create an extreme handicap, how do you all overcome this? 

Gen Forum