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List of Special Elevator Modes

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Re: List of Special Elevator Modes

#191

Post by golemiprague »

derefr wrote: post #100
golemiprague wrote: post #85

Earlier quoted context omitted.

In Jewish monotheism god is beyond time and space, probably because the concept of God tries to encompass the infinity of the universe in time and space and the lack of understanding of those things, us being humans. Therefore when we ascribe some will to god, specifically the will for humans to follow all those rules, we believe that this god "exists" in every time and every space, past present or future. That's why…

Oh, I do get that; I'm more asking why a timeless god wouldn't tell the Jews 4000 years ago to e.g. not construct or partake of social-networking apps (and other such things where they'd have no idea what their God was on about.) An intercessor god dreamed up today would certainly give commandments like that; so why wouldn't a god giving commandments 4000 years ago, but who "exists outside of time", do the same?

In practical terms many orthodox jews don't partake in social media and many other aspects of the internet, although there are many cracks and it infiltrates the barriers. So maybe he did give the right rules from which the current behaviour derived. All the various commandments, not only the famous 10, are interpreted in every point in time and applied. If you study the Talmud you will see that those interpretations happened from day one to many cases which were not explicitly mentioned in the bible.

Re: List of Special Elevator Modes

#192

Post by svat »

grishka wrote: post #161
svat wrote: post #86

Donald Knuth's The Art of Computer Programming has, in its first volume, a lengthy section on simulating an elevator. It is a single regular elevator (nothing "special" going on as in the post here), but even so, as he tries to make things precise, you realize how much detail is involved, and get some appreciation for the task of programming. It occupies about 15 pages (plus several pages of exercises and solutions).…

Hm. I've always thought that the algorithm of operation of a single elevator is fairly simple? While passing each floor, if a button of that floor was pressed (is lit up), or if the button of the direction it's going on that floor is pressed, then stop. If the elevator is not in use and someone presses any call button, go to that floor. That's mostly it. At least that's how I have that algorithm in my head. Now, if t…

Yes that's mostly it for such old elevators (see "Elevator algorithm" https://en.wikipedia.org/w/index.php?title=Elevator&oldid=10...), except:

- The elevator has a "home floor" (the lobby/ground floor) that it returns to by default, if it has nothing else to do. (Apparently many elevators do this; see "Up peak" in the linked post or on Wikipedia https://en.wikipedia.org/w/index.php?title=Elevator&oldid=10... .)

- To set up such a discrete event simulation on a computer, you also need to model timing (how much time it takes to open and close doors, to move between floors with acceleration/deceleration, etc), and users (how many arrive at each floor and when, and where they want to go to, how long they wait before giving up).

- So you end up with a fair amount of state (the "up" and "down" call buttons on each floor, the buttons inside the elevator, whether the elevator is going up or down or neither) and control (when to open or close doors: what to do if someone presses a button while the doors are closing, etc).

- The purpose of that section of TAOCP is to show in detail how to use doubly-linked lists to simulate such things on a computer (which here means getting down to the level of memory layout and assembly code: MIX/MMIX). So overall there are ~5.5 pages of describing the algorithm, ~1.5 pages for memory layout etc, ~7 pages of assembly code, and a page of higher-level stuff mentioning programming languages and profilers etc.

I'm aware of two repositories on GitHub that reproduce this simulation in a higher-level language: https://github.com/meatfighter/knuth-elevator (700-odd lines of Go code including comments from TAOCP) and https://github.com/Quuxplusone/KnuthElevator (500-odd lines of C++14 code without the copied comments). (Learned of the latter via https://www.meetup.com/theartofcomputerprogramming/ a meetup for reading TAOCP.)

Re: List of Special Elevator Modes

#193

Post by strbean »

cunthorpe wrote: post #177
63 wrote: post #72

Earlier quoted context omitted.

I believe your story highlights precisely why more elevators don't include that functionality.

No it doesn't. You can't prevent people from being a-holes and stealthily pressing 10 buttons before leaving the elevator. The feature as described is as useful as pressing a floor to stop on. Perhaps it makes more sense on smaller elevators than it does in large ones. Or perhaps it would make more sense to allow undoing a press only within the first few seconds.

In at least one elevator I rode in as a kid, pressing every button resulted in everything being de-selected.

Re: List of Special Elevator Modes

#194

Post by ars »

bostonsre wrote: post #144
thaumasiotes wrote: post #141

Earlier quoted context omitted.

Because the mind in question exists outside of time.

What is the reasoning behind that tho? If the big dude created the universe, why couldn't he also experience time?

God also created time. So he's certainly aware of it, but it's something he causes, rather than something that happens to him,.

Re: List of Special Elevator Modes

#195

Post by ars »

krapp wrote: post #147
thaumasiotes wrote: post #141

Earlier quoted context omitted.

Because the mind in question exists outside of time.

God cannot be both omnipresent and only exist outside of time. And God does change his mind more than once in the Bible, so clearly that God at least exists within the temporal universe.

> God cannot be both omnipresent and only exist outside of time.

How so? God exists simultaneously at all the moments that exist. Time was created by God, just like the universe was.

> so clearly that God at least exists within the temporal universe.

Imagine you are writing a book, where you, as the author, are also a character. You can interact with your characters as they do things - but you can also go back and change anything you want, and you can see the ending as well.

(Keep in mind that God always maintains free will - God doesn't force any human to act in any particular way, it's always their own choice.)

Re: List of Special Elevator Modes

#196

Post by rognjen »

1024core wrote: post #68

I found a "mode" in an elevator in India that I have not seen anywhere else: if a destination floor number is highlighted, and you press it twice, it gets cancelled. I have used this magic power just once, when an obnoxious man got on and insisted on having a loud conversation on his phone. Since he wasn't paying attention, I double-tapped his floor number and made him skip. I happened to get off at the floor before…

In my experience in Asia it's about 50-50 chance that it's either double-press, long press or second press that cancels it or that it's not enabled.

Re: List of Special Elevator Modes

#197

Post by rognjen »

_squared_ wrote: post #61
mmastrac wrote: post #39

My university had an elevator with a special three-button keypress that took you to a dark sub-basement full of asbestos warnings and terrifyingly dark that wasn't listed on the display.

You should have explored a bit, might be cake down there

I heard it's a lie

Re: List of Special Elevator Modes

#198

Post by DonHopkins »

sevrinsky wrote: post #181
DonHopkins wrote: post #146

Earlier quoted context omitted.

As if they were so clever they could trick God. Pretty presumptuous and irreverent. Why worship a God you believe is such a gullible chump?

Shabbat observance is a massive world unto itself. It originates in Biblical sources (i.e. "the word of God"), but has developed throughout the entire rabbinic tradition, from the time of the prophets through the Talumdic era, and subsequently to the modern day. Today, it is universally accepted in Orthodox Judaism that direct active interaction with electrical appliances is forbidden on Shabbat. However, one may ben…

Of course nobody is actually "tricking god", because there is no god to trick: they're only tricking themselves. So of course it looks to them (the actual gullible chumps in this situation) from inside their tiny little closed-form logical trap of their fictional make-believe "massive world unto itself" role-playing MMPORG that they are "logically consistent", and not both worshiping and tricking a make-believe god who is a gullible chump, but that's sure not the way it looks and actually is objectively from outside in the real world.

They also have just as many stubborn closed-form rationalizations for their outrageously neanderthal sexism, too. Just blame it on centuries of tradition and scholarship ultimately based on chump-god's commandments, not the frustrated angry misogynistic old men who originally invented and still perpetuate it.

How about putting all that energy and ingenuity into coming up with clever exceptions and work-arounds to the traditional misogynistic commandments of a sexist god, that allow you to get away with respectfully treating women as clean and equal human beings seven out of seven days of the week, even while they're menstruating, instead of smugly obsessing on inventing intellectually and physically lazy tricks to cleverly ride elevators without pressing buttons one day a week?

Re: List of Special Elevator Modes

#199

Post by nybble41 »

ars wrote: post #84
dmurray wrote: post #33

Earlier quoted context omitted.

Are they allowed to go down? Also, depending on the counterweight and the current load of the elevator, adding an extra person to it might tax the motor less even when ascending.

Generating electricity is equally forbidden. The prohibition is not work, but rather creation. In this case creating electrical energy.

A prohibition on "creation" is over-broad. Any action taken purposefully can be considered an act of creation. That would include choosing to adhere to the law (thus creating a world where there is more compliance with the law) even if that takes the form of deliberately doing nothing.

The only way I can think of to completely avoid creating anything would be to remain unconscious the entire time, thus preventing yourself from making any choices.

Re: List of Special Elevator Modes

#200

Post by DonHopkins »

1-more wrote: post #110
chadash wrote: post #23

Earlier quoted context omitted.

In Orthodox Judaism, the letter of the law typically is the spirit of the law. Not a perfect analogy, but think of the talmud as similar to the tax code. There are things that are black, things that are white and things that are gray. If the tax code said there's a 5% sales tax on tangerines, clementines, navel oranges, lemons, and grapefruit, I'm probably not gonna volunteer to pay taxes on my Sumo Citruses, because…

> acknowledge something to be technically allowed according to the divine rules, but they forbid it anyway, either because they felt there was some societal benefit to doing so, or because they felt that adding an additional prohibition would prevent people from accidentally breaking the divine rule There are of also cases where a societal benefit outweighed new knowledge about biology. Spontaneous generation meant t…

Aren't worms and lice disobeying the Word of God by not spontaneously generating? Aren't they going to hell for that?
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