I write code and play games and stuff. My old username from reddit and HN was already taken and I couldn’t think of anything else I wanted to be called so I just picked some random characters like this:

>>> import random
>>> ''.join([random.choice("abcdefghijklmnopqrstuvwxyz0123456789") for x in range(5)])
'e0qdk'

My avatar is a quick doodle made in KolourPaint. I might replace it later. Maybe.

日本語が少し分かるけど、下手です。

Alt: e0qdk@reddthat.com

  • 32 Posts
  • 103 Comments
Joined 1 year ago
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Cake day: September 22nd, 2023

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  • It’s not a GUI library, but Jupyter was pretty much made for the kind of mathematical/scientific exploratory programming you’re interested in doing. It’s not the right tool for making finished products, but is intended for creating lab notebooks that contain executable code snippets, formatted text, and visual output together. Given your background experience and the libraries you like, it seems like it’d be right up your alley.




  • What upside down thing with a banana??

    There was a viral video/meme maybe a decade ago about how monkeys peel bananas (might have actually been an orangutan or gorilla in the one I saw; been too long since I’ve seen it) where they peel it from the end opposite of how people are usually shown doing it. I’m guessing they mean that? Basically, instead of bending the stem bit (from where the bananas bunch up), you can pinch the tip at the other end and the peel splits open very easily – it’s easier to do, especially if the banana is still a bit on the greener side of ripeness and the stem part is flexible. (I tried it after seeing it and switched to peeling them from the “bottom” myself.)

    What back bit?

    There is a little black fibrous part of most Cavendish bananas near the tip I was describing; many people do not like eating it and avoid it.

    Also…veins?

    I’m not sure what they mean either.



  • Can Z3 account for lost bits? Did it come up with just one solution?

    It gave me just one solution the way I asked for it. With additional constraints added to exclude the original solution, it also gives me a second solution – but the solution it produces is peculiar to my implementation and does not match your implementation. If you implemented exactly how the bits are supposed to end up in the result, you could probably find any other solutions that exist correctly, but I just did it in a quick and dirty way.

    This is (with a little clean up) what my code looked like:

    solver code
    #!/usr/bin/env python3
    
    import z3
    
    rand1 = 0.38203435111790895
    rand2 = 0.5012949781958014
    rand3 = 0.5278898433316499
    rand4 = 0.5114834443666041
    
    def xoshiro128ss(a,b,c,d):
        t = 0xFFFFFFFF & (b << 9)
        r = 0xFFFFFFFF & (b * 5)
        r = 0xFFFFFFFF & ((r << 7 | r >> 25) * 9)
        c = 0xFFFFFFFF & (c ^ a)
        d = 0xFFFFFFFF & (d ^ b)
        b = 0xFFFFFFFF & (b ^ c)
        a = 0xFFFFFFFF & (a ^ d)
        c = 0xFFFFFFFF & (c ^ t)
        d = 0xFFFFFFFF & (d << 11 | d >> 21)
        return r, (a, b, c, d)
    
    a,b,c,d = z3.BitVecs("a b c d", 64)
    nodiv_rand1, state = xoshiro128ss(a,b,c,d)
    nodiv_rand2, state = xoshiro128ss(*state)
    nodiv_rand3, state = xoshiro128ss(*state)
    nodiv_rand4, state = xoshiro128ss(*state)
    
    z3.solve(a >= 0, b >= 0, c >= 0, d >= 0,
      nodiv_rand1 == int(rand1*4294967296),
      nodiv_rand2 == int(rand2*4294967296),
      nodiv_rand3 == int(rand3*4294967296),
      nodiv_rand4 == int(rand4*4294967296)
      )
    
    

    I never heard about Z3

    If you’re not familiar with SMT solvers, they are a useful tool to have in your toolbox. Here are some links that may be of interest:

    Edit: Trying to fix formatting differences between kbin and lemmy
    Edit 2: Spoiler tags and code blocks don’t seem to play well together. I’ve got it mostly working on Lemmy (where I’m guessing most people will see the comment), but I don’t think I can fix it on kbin.



  • If I understand the problem correctly, this is the solution:

    solution

    a = 2299200278
    b = 2929959606
    c = 2585800174
    d = 3584110397

    I solved it with Z3. Took less than a second of computer time, and about an hour of my time – mostly spent trying to remember how the heck to use Z3 and then a little time debugging my initial program.



  • My guess is that if browsers as we know them weren’t invented, HyperCard would’ve become the first browser eventually. No idea where things would progress from there or if it’d have been better or worse than the current clusterfuck. Maybe we’d all be talking about our “web stacks” instead of websites, and have various punny tools like “pile” and “chimney” and “staplr”. Perhaps PowerPoint would’ve turned into a browser to compete with it.

    If browsers were invented but JavaScript specifically was not, we’d probably all be programming sites in some VB variant like VBScript (although it might be called something different).





  • I’ve never tried to make a stew out of duck before, but if someone asked me to wing it anyway, I’d probably try to use it in a gumbo: Dark roux, Cajun Trinity (celery + onion + bell pepper), jalapeno, garlic, stock, fresh thyme, bay leaf, lots of fresh ground black pepper, spoonful of hot sauce (e.g. Crystal or Tabasco if I can’t get that), plus your meat – served over white rice. For chicken (e.g. chicken thighs), I’d sear it first but I’m not sure on the best treatment for gamey fowl. Personally I might try to blanch it first to try to reduce the gameyness (based on recommendations I’ve seen about cooking certain kinds of stewed pork – like pork belly in Chinese dishes), but you’d do better to get advice from someone who’s actually cooked with gamey ingredients more than I have if you can.

    Adapting a coq au vin recipe might be another idea to try if gumbo doesn’t appeal, but again, I’ve never tried that with duck either.