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

Would it make sense ? Exept for educationnal purpose... wich is the original purpose of pd somewhere...

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?

@Nobody There was some discussion on modwiggler back in 2010...... https://modwiggler.com/forum/viewtopic.php?t=18421
Maybe someone in that conversation had a go....?
David.

Thanks - I will ask there.