How many flies are in my apartment? • Hacker News Board

Re: How many flies are in my apartment?

#151

Post by 411111111111111 » Sat, Jun 19, 2021, 5:32 AM UTC

thaumasiotes wrote: post #135

411111111111111 wrote: post #132

Earlier quoted context omitted.

*insect abuse I think repeatidly slapping them with a pretty soft plastic attraption until they stop moving is even harsher though. Or slapping them outta the air, trying to electrocute them but having too little power on the shitty device so only their wings get burned. Or vacuuming them up Or flushing them down the drain. Honestly, whatever people usually do to them it's way way crueller

> I think repeatedly slapping them with a pretty soft plastic contraption until they stop moving is even harsher It's soft to you, not to the fly. You don't slap a fly "until it stops moving". When you swat a fly, it explodes.

Not the big ones. The first slap stuns them at best, sometimes not even that.

Re: How many flies are in my apartment?

#152

Post by ernst_mulder » Sat, Jun 19, 2021, 7:00 AM UTC

NorwegianDude wrote: post #66

I was really confused about where this was going when I started reading as I thought the title sad files, not flies...

Same here. Turns out to be a staggering number of files actually, much larger than the number of flies.

Re: How many flies are in my apartment?

#153

Post by maverickleopard » Sat, Jun 19, 2021, 6:46 PM UTC

kzrdude wrote: post #150

maverickleopard wrote: post #147

Earlier quoted context omitted.

How exactly do you that and can you interop with python?

I just used this in the Jupyter notebook (toldya it was very simple, written today :). It interoperates with python by being passed data to the draw call. Usage like: c = Canvas(); c.draw(xs); xs is a numpy array of shape (N, 2), the points to draw on the canvas. It's not fancy. But it drew animations faster than matplotlib (I ran this for thousands of frames, just to watch the simulation). import IPython.display as…

That's awesome. I'm probably gonna start using this instead of matplotlib

Re: How many flies are in my apartment?

#154

Post by [deleted] » Sat, Jun 19, 2021, 7:04 PM UTC

maverickleopard wrote: post #149

twphysicsphd99 wrote: post #122

very cool it would be fun to add static attractors -ie fruit to see how it biases the trajectories

Are you trolling or did you not read far enough?

[deleted]

Re: How many flies are in my apartment?

#155

Post by kzrdude » Sat, Jun 19, 2021, 8:26 PM UTC

maverickleopard wrote: post #153

kzrdude wrote: post #150

Earlier quoted context omitted.

I just used this in the Jupyter notebook (toldya it was very simple, written today :). It interoperates with python by being passed data to the draw call. Usage like: c = Canvas(); c.draw(xs); xs is a numpy array of shape (N, 2), the points to draw on the canvas. It's not fancy. But it drew animations faster than matplotlib (I ran this for thousands of frames, just to watch the simulation). import IPython.display as…

That's awesome. I'm probably gonna start using this instead of matplotlib

Maybe just use ipycanvas instead - it's on PyPI :) It works the same way except it's not a hack. I found it after I posted.

I went through:

- matplotlib animations (super slow, not live)

- writing an image with PIL and updating display (flickers)

- custom html+canvas code

- ipycanvas

I call display() on the canvas and then run the draw update loop on the canvas later in the same cell. That way the canvas is first displayed and then "live" updated.

Re: How many flies are in my apartment?

#156

Post by mrlonglong » Sun, Jun 20, 2021, 12:17 PM UTC

There are two hanging around and I've named them after people I hate. I keep the windows open in the hope they'll just fly off.

Re: How many flies are in my apartment?

#157

Post by maverickleopard » Sun, Jun 20, 2021, 3:30 PM UTC

kzrdude wrote: post #155

maverickleopard wrote: post #153

Earlier quoted context omitted.

That's awesome. I'm probably gonna start using this instead of matplotlib

Maybe just use ipycanvas instead - it's on PyPI :) It works the same way except it's not a hack. I found it after I posted. I went through: - matplotlib animations (super slow, not live) - writing an image with PIL and updating display (flickers) - custom html+canvas code - ipycanvas I call display() on the canvas and then run the draw update loop on the canvas later in the same cell. That way the canvas is first dis…

Oh wow even better. Thanks for enlightening me on this

Re: How many flies are in my apartment?

#158

Post by DiggyJohnson » Mon, Jun 21, 2021, 9:23 PM UTC

mLuby wrote: post #115

mLuby wrote: post #113

Earlier quoted context omitted.

I want a mosquito-killing turret [1] that you could put in your bedroom and sleep in peace. Turns out one exists [2] (in theory—no commercial product a decade later), but the one I was thinking of would use microphones rather than cameras [3] to detect the bloody suckers. Thing is, I can't find any prior research or even hints that people have considered this approach. (The closest I can find is an app [4] that detec…

My acoustically-minded friend had the following to say: > Off the top of my head, I'm guessing the problem has mostly to do with background noise, and it only working in moderately quiet environments. > As for locating the source of a sound, there's plenty of research that's been done about that. A directional mic doing sweeps is probably not your best bet, as it would be slow and difficult to cover three dimensions.…

All this work, to suggest a fly spotlight device is hysterical. That would be marginally helpful, and maximally frustrating. I lend the project my full support were it to ever materialize.

Thank you for this analysis.