Ah - that's even better.

Thanks. I now have the following and it is working now.

Why isn't the patch below inverting the input signal?

Is there a simple way to give a single pulse to startup the patch instead of the workaround in the red circle?

Thanks! Yes the loop is working now.

Is such a feedback loop as below forbidden in Pure Data? Can't get it to work...

Now we are getting somewhere:

I'm trying to make a mathematical integrator module (not a slew limiter), and indeed feeding a square wave should result in a triangle wave at the output. But sadly for some reason it's not working...

Thank you! Yes that should work, but strangely I'm not getting the results that I think I should get...

Found out just now that the feedback of y by using [send] + [receive] to get y[n] = x[n]/samplerate + y[n-1] results in a drift of y that ultimately drowns the signal.

Thanks for all the answers! I can indeed now get a very small (one sample?) delay, but the patch no longer works (at least on my computer) as soon as I use block~ 1 or apply a feedback loop for y to get y[n] = x[n]/samplerate + y[n-1]

Perhaps rzero_rev~ (with a=0) is the easiest way to realize a one sample delay?

Something like this perhaps?:

Sorry - I want x and y to be audio-signals. And consequently x[0] and y[0] are the values of the samples taken of x and y at a chosen time 0, x[1] and y[1] are the values of x and y at 1 sample time after time 0. Etc.

How to patch y[n] = x[n]/samplerate + y[n-1] with x the input and y the output in Pure Data?

Thanks - I will ask there.

It's for the fun of it. Hardware analog computers are expensive, and so I was wondering what can be done with Pure Data. Is it possible to write analog computer modules as externals? For instance a "lop~ - one-pole low pass filter" is almost an integrator. Is it possible to make it into an integrator by passing the output back into the input?

But actually this topic is meant to find out if somebody has already made virtual analog computer modules as Pd-externals so that I can just use those externals instead of writing my own?

Has an analog computer or its modules ever been simulated in Pure Data?

Great - thanks!

Thanks! Than I can probably use it in my current project. I will check it out later.