jdhwosnhw

4 ms·

1.
by jdhwosnhw 3mo ago
If you try multiplying two numbers, say 4 digits each, using the standard grade school technique, you'll see that you end up writing the digit-wise product of each number, with a shift (adding a zero at the beginning) for each digit, f
2.
by jdhwosnhw 3mo ago
I was under the impression that because the grade school technique we learn is really just convolution over the digits, the fastest algorithms achieve o(n logn) via fourier transforms. Is that not the case?
3.
by jdhwosnhw 3mo ago
I think the biggest (and, in my opinion, obvious) problem with this argument is that it relies on time having no value in the eyes of the consumer (or, equivalently, that the seller believes this to be the case). A consumer 5 years after a
4.
by jdhwosnhw 4mo ago
> fully reusable rockets are going to be one of the most important engineering achievements in human history The number of implicit biases, assumptions, and unsubstantiatable assertions packed into that extremely confident sentence is fr
5.
by jdhwosnhw 5mo ago
Fyi the unscented Kalman filter is both easier to implement than the EKF, and also avoids several of the requirements that come along with the need to linearize (such as the differentiability requirement mentioned in the article). Also (to
6.
by jdhwosnhw 5mo ago
That’s because, as the article explicitly states, this post is by walletwallet’s developer
7.
by jdhwosnhw 8mo ago
> A Starlink satellite uses about 5K Watts of solar power. It needs to dissipate around that amount (+ the sun power on it) just to operate. The “+ solar power” part is the majority of the energy. Solar panel efficiency is only about 25-
8.
by jdhwosnhw 10mo ago
This still relies on a heat differential, as described in the Details section of your linked article: https://en.wikipedia.org/wiki/Thermophotovoltaic_energy_conv...
9.
by jdhwosnhw 10mo ago
Useful, extractable energy comes from a temperature differential, not just temperature itself. Once your system is at temperature equilibrium, you cant extract energy anymore and must shed that temperature as heat
10.
by jdhwosnhw 10mo ago
This argument assumes that you only need to radiate away the energy that the solar actively turns into electricity, but you also need to dissipate all the excess heat that wasn’t converted. The solar bolometric flux at the earth is 1300 w&#
11.
by jdhwosnhw 10mo ago
Thats not how big-O notation works. You don’t know what proportionality constants are being hidden by the notation so you cant make any assertions about absolute runtimes
12.
by jdhwosnhw 10mo ago
In most places in the US (california being a notable exception) taxes are reassessed regularly based on market conditions. In some areas this can result in the property taxes rising to an appreciable fraction of the mortgage rate - or in th
13.
by jdhwosnhw 10mo ago
> Happiness simply comes from other things in life than 'my castle my kingdom'. I know its a typical US mindset (and far from US only) to have a house on your own, but its still an emotion This is a frustratingly uninformed tak
14.
by jdhwosnhw 10mo ago
Thats like saying the grocery store is ok with me eating some of the grapes while I shop so they must be ok with me walking out without paying for my groceries. I’m not trying to be obtuse here. I really want to understand some sort of reas
15.
by jdhwosnhw 10mo ago
Except in this case the only way the store makes money is either by you paying an entrance fee or by you looking at the products. You are being delivered a service (whose delivery costs money) while actively circumventing the mechanism the
16.
by jdhwosnhw 10mo ago
You are using a service without paying for the service by actively circumventing the payment mechanism. Is that not stealing?
17.
by jdhwosnhw 10mo ago
I would genuinely like to understand this perspective. Ads or paying for premium is how the underlying business makes money. The UX might suck but you have a choice - you can just not watch YouTube. The approach you describe (which i unders
18.
by jdhwosnhw 11mo ago
A slightly stronger (and more relevant) statement is that the number of mutually nearly orthogonal vectors you can simultaneously pack into an N dimensional space is exponential in N. Here “mutually nearly orthogonal” can be formally define
19.
by jdhwosnhw 1y ago
That would also be an incorrect phrasing. This entire thread is a good illustration of the difficulty of speaking precisely about probabilistic concepts. (The number of successes has zero uncertainty. If you flip a coin 10 times and get 5 h
20.
by jdhwosnhw 1y ago
> How much of a chance do you think we have of meaningfully changing a government, if they can guess with 80% degree accuracy how everyone voted, based on their chats and social networks This doesnt really detract from your overall point
21.
by jdhwosnhw 1y ago
Unfortunately I’m in the same boat. What appears especially telling is: > tVNS applied for 30 min daily over 7 consecutive days increased VO2peak by 1.04 mL/kg/min (*95% CI: .34–1.73*; P = .005), compared with no change after s
22.
by jdhwosnhw 1y ago
I’m not sure what you mean by “higher population” but fyi what determines the required number of samples is a function of the full shape of the underlying distribution. For instance the Berry Esseen inequality puts bounds on the convergence
23.
by jdhwosnhw 1y ago
I’ve heard this statistic before and it always strikes me as basically a non-sequitor. You’re writing down two percentages as if they are meaningful with respect to one another, but they arent. If we as a society agree that some sort of pro
24.
by jdhwosnhw 1y ago
I would still say its completely wrong, given that this explanation makes explicit predictions that are falsifiable, eg, that airplanes could not fly upside down (they can!).
25.
by jdhwosnhw 1y ago
> Yep, for me it confirms all the reasons why I think python is slow Yes, that is literally the explicit point of the talk. The first myth of the article was “python is not slow“
26.
by jdhwosnhw 1y ago
Very reasonable, I fully agree on that front
27.
by jdhwosnhw 1y ago
I thoroughly disagree with this sentiment. In my experience, the most helpful approach to performing RCA on complicated systems involves several hours, if not days, of hypothesizing and modeling prior to test(s). The hypothesis guides the t
28.
by jdhwosnhw 1y ago
Looks like your personal website isnt set up yet, its giving a wix error
29.
by jdhwosnhw 1y ago
I posted a very similar (perhaps more combative) comment a few months ago: > Peoples’ memories are so short. Ten years ago the “well accepted definition of intelligence” was whether something could pass the Turing test. Now that goalpos
30.
by jdhwosnhw 1y ago
Not really. You can calculate the statistical significance of the difference of these measurements, which I’ve done here: https://www.mycompiler.io/view/4LA310YXZHO For a null hypothesis of “their differences are consi

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