How many flies are in my apartment?

Post by jdavis703 » Fri, Jun 18, 2021, 8:55 PM UTC

only_as_i_fall wrote: post #19

fmax30 wrote: post #8

Earlier quoted context omitted.

This is the norm in the south asian country I come from. But ever since I moved to the EU, there have been no nets, then again there are noticeably fewer flies here too.

Dont the windows have screens? In the US pretty much every window has a permanent screen outside the panel for this purpose...just assumed it was the same in europe

Post by a11r » Fri, Jun 18, 2021, 10:13 PM UTC

nyokodo wrote: post #133

gnulinux wrote: post #118

Earlier quoted context omitted.

That's scary. I used to be a hardcore insectaphobe, but I got over it over the last couple years. Now I don't care that much when I see insects in my house. But it is within reason! I wouldn't want bugs reproducing in my house, that sounds like a slippery slope!

> I wouldn't want bugs reproducing in my house, that sounds like a slippery slope! Don’t Google dust mites.

Post by tailspin2019 » Sat, Jun 19, 2021, 12:16 AM UTC

paul_manias wrote: post #139

Andrew_nenakhov wrote: post #128

Earlier quoted context omitted.

I admire your perception. I'm personally unable to distinguish different fly specimens, they all look the same to me.

It's only the size and age of them that makes one fly distinguishable from another. When they're all being born at the same time there's absolutely nothing that makes them distinct, and that's your clue that eggs have been laid somewhere in the vicinity.

Post by JoBrad » Sat, Jun 19, 2021, 12:23 AM UTC

esaym wrote: post #131

m12k wrote: post #40

In my statistics class we were taught a technique for estimating the number of flies in a barn. You capture a fixed size sample of flies, e.g. 100, and give them each a little white dot on the back, then release them all back in the barn. Leave them to mingle for a while, then capture another fixed number of flies, e.g. 100. If 5 of them have a white dot on them, then you estimate that the 100 flies you captured orig…

But how do you catch flies!?!?!

Post by kzrdude » Sat, Jun 19, 2021, 2:08 AM UTC

maverickleopard wrote: post #147

kzrdude wrote: post #117

Earlier quoted context omitted.

I ended up writing some very rudimentary HTML canvas + javascript drawing code into the notebook and for my purposes it's fast and does the job. Just to note to others, that this is a possibility within a Jupyter notebook. One obvious benefit is that it can start rendering "live" and continuously and doesn't have to generate the whole animation before starting to show it.

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

    import IPython.display as ipydisplay
    import json
    import numpy as np

    class Canvas:
        def __init__(self, canvas_id=None, width=500, height=500):
            self.display_id = None
            self._canvas_id = canvas_id or ('canvas_' + str(np.random.randint(0, 10000)))
            display(ipydisplay.HTML(f"""

            
            Your browser does not support the HTML5 canvas tag.
            """))

        def draw(self, xs, world_size):
            xs_string = json.dumps(xs.tolist())
            obj = ipydisplay.HTML(f"""
            
            var c = document.getElementById("{self._canvas_id}");
            var ctx = c.getContext("2d");
            var xs = {xs_string};
            var size = {world_size};
            ctx.clearRect(0, 0, c.width, c.height);
            var scale = c.width / size;
            for (let i = 0; i 
            """)
            if self.display_id:
                ipydisplay.update_display(obj, display_id=self.display_id)
                return self.display_id
            self.display_id = display(obj, display_id=True).display_id