Martin D

I'm using GenExpr for the first time, and I have a strange issue.

I have a function with three input parameters that should return the value of input 1 or 2 depending on the value of input 3. Returning the parameter variables directly causes the conditional return to never happen, but it does work if I reassign the inputs to a new variable and return that instead. 

Meaning I am able to get it to work, but I don't understand why this is, so I wanted to post here in case someone knows something or it's a bug. I haven't found anything similar mentioned in docs or other posts. FYI I'm working in Max For Live, but I've had no other issues that I know of. Thanks.

I'm working only in Max For Live so a video was faster. To the right is the value of [out3] of [gen~] in a different window. 

GenExpr - func w/ conditional returns fails to return input variable unless assigned to new variable

genexpr-func-w-conditional-returns-fails-to-return-input-variable-unless-assigned-to-new-variable

vichug

This is not such a big deal, since you can give a default value to a gen param as a first argument and other [param]'s attributes should work ; but apparently if you give a default value to a gen [param ] operator using the "@default" attribute, it doesn't work ; the param won't have the value you've given it as a default. Attached is a very simple example : if you click on the yellow arrow on the edge of object box in edit mode, then go in "attribute" tab you should see that "aparam" is set to 0 and "anotherparam" to 1, whereas they should both be 1 because i used the @default attribute for "aparam". sorry if this is a bit tedious

gens-param-operators-attribute-default-doesnt-work

That's been logged internally as a bug now (ticket #9897 for whatever that's worth).

gen~'s [param] operator's attribute "@default" doesn't work

hcenteno

I created a Gen~ patch that just contains a Codebox and inlets and outlets. I created it giving it a name as parameter and I can see a gendsp file was created.  I'm able to use it in new patches but for some reason in either the original patch where I created it or in new patches I'm now unable to edit it (I want to ad some nodes).  I can open it and see the contents but editing is disabled everywhere. I can probably just copy and paste the code into a new editable one, but I'm curious to know why is editing disabled. Is this a bug or am I missing something? I'm using Max 8.6.2 on Windows 11.

I created a Gen~ patch that just contains a Codebox and inlets and outlets. I created it giving it a name as parameter and I can see a...

unable-to-edit-gen-patch

Unable to edit Gen~ patch

Yueting Wu

I am trying to create a readable wavetable within gen~ using the data object 

since I need the patch to work for Oopsy daisy, the patch cannot refer to any external buffers in max

The closest answer I was able to get was this post:

https://forum.electro-smith.com/t/oopsy-wavetable-synth-without-reading-from-sd-card/3736

--using the codebox object to manually input sample values of waveforms into the data object 

The OP's patch (basic waveform oscillator) works, but when trying to add new waveforms to the patch, I ran into issues: 

I obtained sample values (256 samples) of the single-cycle waveforms from 

https://www.adventurekid.se/akrt/waveforms/

 and input those values into the codebox, I received the following errors

I double checked and the list of values I put in indeed contained 256 items, so I am confused about why it "exceeded the maximum of 256"...and then I checked the amount of items in the lists that OP put in, and they actually contained less than 256 values (250&248 respectively)...so I just deleted the last few values from my list....the error disappeared but still there is something wrong:

It seems like it's reading the new waveform I put in twice as fast as it should????

I am very new to all this and not sure if I am doing something wrong here,  or if there is any other ways of creating a wavetable completely within gen~ 

*"Datawavetable" contains OP's waveform, "datawavetable2" contains the waveform I tried to put in 

hi ! 

I am trying to create a readable wavetable within gen~ using the data object 

since I need the patch to work for Oopsy daisy, the...

writing-waveforms-into-data-object-in-gen-without-referring-to-an-external-buffer-in-max

writing waveforms into data object in gen~ without referring to an external buffer in max? 

MakePatchesNotWar

I don't understand the behavior of peek in this patch. If i'm correct it should output the same value from peek specified by the 2nd inlet over all mc-channels. Anyone knows why it doesn't? 

I don't understand the behavior of peek in this patch. If i'm correct it should output the same value from peek specified by the 2nd inlet...

issue-reading-back-values-with-peekdata-and-mc-inside-gen

Issue reading back values with peek/data and MC inside Gen

Hank Borders

Anyone know how to get rid of noise made when changing the delay time of a circular buffer(data object). 

I've got a "data" object in Gen~ and a "counter" is writing to it and then and an offset counter is reading from it at a delayed time. Essentially a write and read head of a tape loop. When I adjust the delay time I get some weird high frequency noise. I'm assuming that it's because the read counter is moving faster than the sample rate and skipping samples resulting in discontinuity or it. 

Anyone know how to get rid of noise made when changing the delay time of a circular buffer(data object). 

I've got a "data" object in Gen~...

circular-buffer-delay-sampling-problems

Circular Buffer Delay sampling problems

Phil Maguire

I'm having an odd problem with this harmonic oscillator I'm working on. As I increase the partial (multiplier of the sine wave frequency), the gain decreases... unless I remove everything I put in to avoid clicks. 

 is basically a filter, then I think I get why it's happening, but it also does it if I use the 

Gain issue when using [slide] to remove clicks

gainslide-issue-with-frequency-multiplication

Tarik Barri

I must be overlooking something insanely obvious, but I can't figure out what.

...fails to compile, and gives me the error message:

gen_domain: dsp.gen: [string "gen2.dsp.Model"]:1687: attempt to index local 'instance' (a nil value)

(EDIT - this refers to the 'gen' object, not the 'jit.gen' object)

I've reproduced on several max versions and two computers, but can not find this issue mentioned anywhere online.

Any hints as to what's going on would be greatly appreciated

I must be overlooking something insanely obvious, but I can't figure out what.
This gen code:

getOne() { return 1.0; }
getOneIndirect() { return getOne(); }
if (getOneIndirect() == 1.0) {
  out1 = 1.0;
}

...fails to compile, and gives me the error message:gen_domain: dsp.gen: [string "gen2.dsp.Model"]:1687: attempt to index local 'instance' (a nil value)

(EDIT - this refers to the 'gen' object, not the 'jit.gen' object)
I've reproduced on several max versions and two computers, but can not find this issue mentioned anywhere online.

Any hints as to what's going on would be greatly appreciated
-t


I must be overlooking something insanely obvious, but I can't figure out what.
This gen code:
getOne() { return 1.0; }
getOneIndirect() { ... 

impossible-to-use-returned-value-from-function-in-if-statement

Hi Tarik,

I just added an else block and it works fine. 

I see, it's the "jit." that made it compile, not the 'else' statement.

The moment I remove the "jit." prefix and it becomes a regular 'gen' object, it stops compiling. So without wanting to jump to conclusions, I am tempted to go with the hypothesis that 'gen' is basically broken for now?

gen~ (with the tilde) seems to be slightly more robust than gen, but also this fails to compile when I get a bit deeper into conditionals:

and here's another amazing bug. Once this empty for loop is present, the output simply stops functioning (in both gen and gen~), so that this two line code doesn't work.

for(index=0; index < 1; index+=1) {}
out1 = 1.;


I can't possibly be the first one to run into all this weirdness, so maybe someone who's gone through this can tell me how they deal with these issues? 


Hi Tarik! 

I copy pasted your code into a codebox in jit.gen and it gives me exactly the output you would expect, without compilation errors. 

In "gen" instead it gives me the error you mentioned. 

Sounds like a bug, I will report it

Hey Tarik, so great to see this discussion here, my 2cents:
They do indeed need to work on making the max-window error messages from gen~/gen/jit.gen a bit more useful/helpful to us 🙏

seems like your code should work, i even tried adding a superfluous argument to the functions like the 'p' in the functions for Gregory's article here, as well as tried saving to a .genexpr file and instantiating using 'require'(thinking maybe it might compile differently when in an extraneous .genexpr file), still didn't work, even though Gregory's functions seem to have the same basic structure:
https://cycling74.com/tutorials/gen~-for-beginners-part-7-creating-reusable-tools

(also tried all those steps in both gen and gen~, couldn't get it to work)

i do know that 'gen'(without the tilde) handles scheduling and memory differently('gen' needs to be triggered from outside, or have internal metro on using '@active 1'... also cannot use things like 'buffer' but still can use 'data' instead), so maybe better off trying things in gen~ first.

i dunno... i tried, hopefully it at least helps whittle out some testing(maybe also posting Gregory's article can help you find some thread of similarity to follow).

Thanks both!!

I've now found that if I take the functions of which I want to test their outputs in an 'if' statement, and store the results of these functions in a 'History', I can use these functions. So:

getOne() { return 1.0; }
getOneIndirect() { return getOne(); }

History enableFunction(0);
enableFunction = getOneIndirect(); 
	
if (getOneIndirect() == 1.0) {
  out1 = 1.0;
}

...and if I want to do this with functions which take variable arguments, I need to use these same variable arguments when storing the results in the 'History', otherwise it will still fail.

The thing that most confuses me about this all though is not the bug itself, but the fact that it seems as if I'm the first one to ever try using returned function values in an 'if' statement. Which surely can't be true. I'm not that totally unique and special, or...?

the reason why your genbug2 patch creates silence is due to the code generated from your GenExpr code inside the Codebox - whereby its not yours code fault.

If you open the "code" sidebar of the gen (gen~, jit.gen, jit.gl.pix) patcher - the stylish C in the right hand toolbar -  you can see that the "code generator" has set out1 & out2 to 0 ... hence silencio ;-).

I also currently experience "gen code generation" weirdness, where an else block is just "optimised away", but that happens in the jit.gen.

But I guess, wheter audio or video domain, there is only 1 code generator that not only translates the "normal" gen operator patches, but also the GenExpr Code we type into Codebox into an intermediate GenExpr Code that its visible in the "code sidebar".

So if you experience weird stuff, the code sidebar is the place where you might detect THAT something weired / wrong was generated from your code.


Yes actually I noticed this too and this can help indeed. Not with the other errors unfortunately. But this 'history' hack I described above seems to make things work... for now...

Impossible to use returned value from function in if-statement?

Massimiliano Cerioni

I needed to make an accurate latency test of my system, so I took inspiration from the old MSP latency test patch under 

 folder and built an alternative version in gen. There were a couple of active discussions 

, from which I took the threshold trick that Graham implemented.

I needed to make an accurate latency test of my system, so I took inspiration from the old MSP latency test patch under...

a-new-io-latency-test-patch-made-in-gen

A new IO latency test patch made in gen

woyteg

Can we use a function as an argument to a function?

doFun(fun, val){
return fun(val);
}

addFun(val){
return val+1;
}

out1 = doFun(addFun, in1) ;

Hi,

GenExpr/Codebox:

Can we use a function as an argument to a function?

Something like this?

doFun(fun, val){
return...

Cycling '74 Forums

I forgot about the code tab, thanks for reminding me. I'm still new to max. Yes, the 'return' should definitely not be omitted. I'll...

@martind it's working here on 8.6.2

I created a Gen~ patch that just contains a Codebox and inlets and outlets. I created it giving it a name as parameter and I can see a...

Can you share how you are getting the sample values for the waveform? It must be during that process that something is going wrong, as...

Solved by not actually making use of MC and doing it all in regular...

>The delay operator in gen~ doesn't understand "@interp 1", it should be e.g. "@interp linear" or "@interp cubic" etc. Aha! This worked! I...

Gain issue when using [slide] to remove clicks

Buffers in gen(without the tilde) seem to be working fine on my end

I needed to make an accurate latency test of my system, so I took inspiration from the old MSP latency test patch under...

Hi, GenExpr/Codebox: Can we use a function as an argument to a function? Something like this? doFun(fun, val){ return...