4 ms·

https://github.com/dateutil/dateutil/blob/master/dateutil/easter.py https://github.com/dateutil/dateutil/blob/master/dateutil/ea...

wyager 9y ago
What's the embedding for division and modulation into systems of gears? I imagine it's somewhat expensive.
- a_c 9y ago
  some miniature version of this perhaps https://www.youtube.com/watch?v=wwh0KH-ICCw https://www.youtube.com/watch?v=wwh0KH-ICCw
- Someone 9y ago
  Multiplying angular velocity by a constant is easier than adding a constant angular velocity. To multiply by m, use two gears with diameters in ratio m:1. To divide, switch the gears. I wouldn't even know how to subtract a constant angular velocity. I don't think you need that, though; if you know at what speed all your gears will rotate, a constant addition/change can be replaced by a constant multiplication/division: a+b = a * (a+b)/a
  - pavel_lishin 9y ago
    If the angular velocity doesn't have to be constant, could you skip gears?
  - thechao 9y ago
    Differentials have the property of being universal angular velocity adder/subtractors at fixed ratios. output := K * (input0 + input1) / 2 Spur-gear differentials are suitable for watches.
a_c 9y ago
Wow! I didn't know if not (1 <= method <= 3) is supported syntax! I would always use method >= 1 and method <= 3
- Avshalom 9y ago
  I seem to remember an article once on how the associativity in cases like this not always lining up with what you think/want so be careful with it.
  - andrepd 9y ago
    That's probably only applicable to floating point arithmetic, since integer comparisons don't suffer from those problems.
    - eru 9y ago
      Floating point arithmetic has associativity issue, but that's not the problem here.
- ericfrederich 9y ago
  https://docs.python.org/3/reference/expressions.html#comparisons https://docs.python.org/3/reference/expressions.html#compari... It's one of those things I probably wouldn't want to use. Like the 'else' clause of a for loop is useful sometimes, but when you use every single feature of a language it makes it harder for newcomers to read.
  - scott_karana 9y ago
    I agree with your principal, but 1<x<9 is bog-standard high school algebra. ;)
- deleted 9y ago
  [deleted]

wyager 9y ago

What's the embedding for division and modulation into systems of gears? I imagine it's somewhat expensive.

a_c 9y ago
some miniature version of this perhaps https://www.youtube.com/watch?v=wwh0KH-ICCw https://www.youtube.com/watch?v=wwh0KH-ICCw
Someone 9y ago
Multiplying angular velocity by a constant is easier than adding a constant angular velocity. To multiply by m, use two gears with diameters in ratio m:1. To divide, switch the gears. I wouldn't even know how to subtract a constant angular velocity. I don't think you need that, though; if you know at what speed all your gears will rotate, a constant addition/change can be replaced by a constant multiplication/division: a+b = a * (a+b)/a
- pavel_lishin 9y ago
  If the angular velocity doesn't have to be constant, could you skip gears?
- thechao 9y ago
  Differentials have the property of being universal angular velocity adder/subtractors at fixed ratios. output := K * (input0 + input1) / 2 Spur-gear differentials are suitable for watches.

a_c 9y ago

Wow! I didn't know if not (1 <= method <= 3) is supported syntax! I would always use method >= 1 and method <= 3

Avshalom 9y ago
I seem to remember an article once on how the associativity in cases like this not always lining up with what you think/want so be careful with it.
- andrepd 9y ago
  That's probably only applicable to floating point arithmetic, since integer comparisons don't suffer from those problems.
  - eru 9y ago
    Floating point arithmetic has associativity issue, but that's not the problem here.
ericfrederich 9y ago
https://docs.python.org/3/reference/expressions.html#comparisons https://docs.python.org/3/reference/expressions.html#compari... It's one of those things I probably wouldn't want to use. Like the 'else' clause of a for loop is useful sometimes, but when you use every single feature of a language it makes it harder for newcomers to read.
- scott_karana 9y ago
  I agree with your principal, but 1<x<9 is bog-standard high school algebra. ;)
deleted 9y ago
[deleted]