downut

I am so sorry it is this way now. I personally believe if you have imposters in the class who intend to learn nothing it degrades the experience even for the highly motivated. Humans want to be in incentive-aligned learning experiences.

I had one fellow in the back of the room at UF in the basic algebra 1 course(!) who began the semester by once or twice a class doing a reasonable impression of a mooing cow. I kicked him out. Didn't happen again. Classroom atmosphere had better vibes after that.

Why would you grade math homework? I taught "intro math"[1] through algebra and calculus to linear algebra at UF and ASU over four years as a paid graduate TA. This was the middle '80s. I assigned homework from the text every class. At the beginning of every class we (the students and me) worked through any particular problem any student wanted. That was 15min, max. Then I lectured and assigned more homework. I graded my own 3 in-class closed-book exams and final exam.

Based on the classes the Math Department gave me (very satisfying) and the student evaluations this seemed to work more or less fine. I was a brutal grader though, some of those entry level classes had bimodal distributions with 'F' being the low mode.

I also showed up for office hours and did my best to help people learn by digging through their questions.

I don't see why this methodology wouldn't work fine today. I wouldn't care now how a student learned. Show competency on the human only test and we're good.

I had one student who achieved a solid 'F' come by office hours after the course to tell me how much he enjoyed my teaching. Whatever!

Anyway, teaching that way, with the positive interactions with students interested in learning, was one of the greatest experiences of my life.

[1] An absolute pedagogical shitshow that wasted everyone's time for zero gain.

AirBnb is camping. I have been travel camping with and without people for 50 years. The longer you camp the better the experience. Almost all of the first 25 years involved a tent (or bivy sack), and maybe a camp kitchen. Then you surface again, happy minded, into a world where people travel but they expect everyone touching their utensils or even maybe food(?) have a "Food Handler's card or certificate". Whatever that is. Back into the bush.

I started grad school at math in Sept. 1995 and:

"There's never been a better time to go into math" was the final statement of the ten minute orientation session from the Dep Chairman.

It was a great thing to do anyway.

Then.

Ah. So now we are talking about multi-precision libraries, which their basic reason for existing is that different precision formats yield different economically interesting results, via a variety of a not-large set of economically interesting tradeoffs.

The 80 bit format was an at-the-time (ATT) engineering optimization that made ATT double precision (DP) more attractive given the better round-off behavior, at "no-cost".

So the interesting question here (that I don't know) is: is "deterministic" quad-precision (QP) as the accuracy upgrade from "non-deterministic" 80bit internal DP, always better economically?

Depends on what the computational problem is, given a budget. And that budget buys things that are only available on the market.

I used to think technology monocultures were a good thing but given the current state of things I have reversed myself. I am happy that life has simplified for you though.

I've been watching, lightly, interval arithmetic for 40 years. As you know algorithm sensitivity information is mandatory. We used intel 80bit FP do evaluate that, slowly, back in the day. We didn't use interval arithmetic, though we knew about it. It wasn't economically viable. Hey C++ what can you do for us? Templates, damn.

How important is interval arithmetic, economically, now?

TY. I am ignorant of the compiler side of the process here. My mental model as a former numerical algorithms guy at the time was that the x87 chips performed the 80 bit operations as opaque internal operations, and returned the visible results back as 32/64 bit IEEE754 floating point format bytes.

Is that inaccurate? If not how did you store the extra 16 bits (DP)? I should've bought a zortech compiler back in the day? ;-)

I am sorry that Borland hooked me with turbo-p and then jacked me up with turbo-c/c++.

Aha! TY. Sun's floating point people were world class but I still think this was a dumb thing to do.

With the NAS Parallel Benchmarks we were trying to encourage as wide a diversity of hardware and algorithms as possible so we were lenient with the acceptable "valid" interval of "correct" behavior. I've already discussed heretical Cray FP. Those were fantastic systems. No way would we disqualify some weird/different algorithm/architecture if it meaningfully advanced the SOA in performance/efficiency. OTOH wars were fought over having any firm accuracy requirements at all. So this jvm thing looked... pointless at best?

This is all nostalgia for a past that actually was. Those were the days my friends.

"numerics people ignored it"

I dunno Walter but as the first(?) IEEE754 implementation in a PC system it seemed like a pretty damn big deal to us people working in numerical algorithms. It was a big enough deal to me at the time (I was in graduate school) that I've kept my 8087 chip all my life and have it before me now. I see the old boy has lost a pin during the last move, dammit.

Chip has "3716150AA MALAY BEV 22" embossed on the pin side. Search gets me nothing.

The 8087 came out when the premier numerics processors worldwide were the various Cray/CRI products, and if you know this much about the 8087's extended register format then it's likely you already know about Seymour's opinion expressed in silicon about the handling of the LSBs. As a freshly minted computational mathematician I was worried about the Cray systems accuracy on long running computations but after 5 years right on the front lines of the 1-4 highest throughput systems worldwide, with, ISTR, zero practical effect on any computation that ever mattered. Huh turns out Seymour was smarter than me. Should've picked up a shovel.

As far as delivered accuracy of the 8087, performing the operations at 80 bits, rather than 64 it was better than non-extended formats. Anyway you can read all about it here:

https://en.wikipedia.org/wiki/Extended_precision#x86_extende...

Kahan endorsed is all I needed to know.

I can't remember the details from back then but the initial Sun java implementation did something weird with this.

I just went to zillow and typed in my zip and tried two different filters for single family homes priced between $300K-$550K:

Listings:

No HOA fee: 32 up to $500/month: 62

I'm not going to bother because this is an HN comment but I think you can imagine what happens to the results when I specify newer than say 1993 (when my house was built).

I have an HOA, but it seems defunct. Everything we do to the house, if visible, can be interpreted to mean I must get unanimous agreements, in writing, from all my neighbors.

It turns out I managed to land right between two asshole neighbors (constant trespassing, dogs, etc)

Ok, I have not indulged in the new paradigm of work your way to the interesting stuff. I just did occasionally dabbling back in the day, but I wonder: I fully understand the intent of making a prospective good citizen demonstrate commitment and the level of service-side management effort to make this social network paradigm work.

But isn't this sort of structure just completely transparent to [Nation|Narco]/State Actors? Feel free to widen the set of economically interested actors.

How do you scale video interviews?

I think I am missing something about this scene. I really want to dive in tho.

Can't you replace the keyboard? (I'm assuming "workstation" != laptop). I have mechanicals laying around that I would just haul with me into work.

"... seems to be ..."

Compared to what? Your string of comments are banal generalities that may or may not apply to this particular situation. Where else in this world at this time, is this particular governmental failing handled materially better?

Singapore? China? Russia? Switzerland? England?

I have sometimes learned interesting things from you (as a commenter) but there is nothing to learn here. It appears to be only diversion and distraction.

"here"

It's a big world out there, whatever "here" means.

That last sentence makes me wonder, do you enjoy ads?

I went to a Super Bowl party a while back and the half time show glitched continuously. Random weird glitches for the rest of the time. => note to self: don't pay for this.

Huh, two houses back I had a really fucking POS dryer that I got expert at replacing the "Dryer Thermal Fuse" (pick your own youtube video walkthrough) and my foggy memory says in my ear that it was an LG dryer. So I'm thinking, this commenter malfist, doesn't know what he is talking about and I'll go look in my notes.org and... NOPE! It was a Samsung DV42H5000EW/A3 model!

Sorry malfist for thinking bad thoughts. I've redirected all that negative energy back to its rightful owner: Samsung.

The washer next to that dryer was an LG, and in my notes I never touched it.

Always good to reattach to reality.

Ah, I see that the washer/dryer pair we bought new 4 years ago and hauled across the country are LG ThinQs. Very happy with them. Apparently can be "smart" but I shut that down.

It is in actual fact not difficult to "drop communication with for hours at a time". This was the human norm for millenia, up to a decade or so ago. And given the toxic side effects of all this communication it's probably going to have to be worked out again.

We raised a child with the principle that "No News is Good News". She turned out great! And she lives that way still. That constant level of screen stimulation is strictly not necessary for family happiness, and I think you all who think so have not really internalized what it means for a child to learn responsibility.

See also free-range kids, and the social insanity that causes kids/parents to get arrested for eg playing in a park alone. There's a bunch of mental illness out there, and the screens are big reason why.

Oh right. My beautiful daughter reads books constantly. Weird that, huh.

It's perhaps not intuitive but it turns out organized anglers have been a big part of rescuing various fish populations. For instance, as a member of the "Backcountry Hunters & Anglers" group me and about 20 other members hiked up the West Fork of Oak Creek in Oak Creek Canyon AZ with heavy backpack tanks filled with (formerly) endangered Apache Trout fingerlings. It was absolutely wonderful to watch the little ones swim away. Trout Unlimited has a ton of conservation efforts including habitat, which helps viability of a whole bunch of other species.

Similarly, you can read the book "People of the Sturgeon: Wisconsin's Love Affair with an Ancient Fish" to learn about how the people around Lake Winnebago came together to restore the health of its native Sturgeon population.

This idea of "othering" human beings apart from the animal world might sound like the most effective way to "help" animals but humans, being complicated, don't work that way.

I couldn't care less what you eat, if it makes you happy, awesome. But there's a whole lot more going on culturally with conservation that is entwined with the evolved nature of human beings.

The concepts TT describes are very patiently and pleasantly explained in the recent book "The Score", by C. Thi Nguyen.

Ok, debian forky, 155.0.1, successfully logged into vultr.com after a year inactive, added a credit card and a little credit. I do, however, still stupidly use google authenticator for 2FA. The captcha was just a checkbox.

That said I have run into a number of unsolvable captchas lately on firefox. Had to use chromium on a healthcorp insurer site.

It's possible that I'm in your grandparent's generation, or maybe your parents. I'm 65. I don't want to derail the conversation, but I do want to correct the bit about "exercise as a hobby was viewed as extremely weird, runners used to be arrested!". In the '70s at least, running was extremely normal. Endurance bicycling was normal. For instance, starting in 1979. I bicycled all over the South: FL GA NC, at least. These were then as they are now quite provincial from the POV of alternate ideas. 10K runs were a thing, with thousands of participants. As were Marathons. Cross country running was a popular high school sport.

If you want to talk about work, well I'm adjacent to 5th generation farmers. Self driving climate controlled machinery is a thing now, but! hard to imagine I know, people had tractors back then too.

So, plausible as it might sound to ascribe some of the causality to flow from "the physical activity transition", I don't think it holds up.

Suppose "Reflections on Trusting Trust" is not the naive rantings of some obsolete dinosaur.

Why does it not apply?

My wife and I retired to Tucson last year, and intentionally went through this first summer just to get the full experience. Never again! We've been under flash flood warnings the last several days and have only had a few sprinkles to go with the 108F days.

So... I had a look at Eureka CA weather this morning. Looks like Western Norway. Nice. Spending July and August up there might be mandatory for our mental health.

We spent 3 years in Tempe back in the '80s. It sucked then too.

LOL. We could all be Greek! I have 2, 50lb bags of Western Miracle Type S Lime that I moved across the country to a new house and don't have a current use for. It made really awesome pavers with the gazebo excavation dirt on the previous project.

Would painting lime work on city streets, interstate freeways, and parking lots, though? I hadn't thought of that. I'm not going to look it up but an enormous number of house roofs here are pure white from some sort of white/plastic/rubber concoction.

Phoenix and Tucson are in the main swath of the Sonoran Desert, which to the unaccustomed eye (as mine was, initially) is all just burning hell dirt and rocks. The undisturbed state of the Sonoran Desert is actually pretty amazingly green. Not like a forest. But cast an eye on the Mojave Desert, which is what Eastern CA deserts are. Or, for the biggest contrast I've ever seen, the irrigated lands next to the Nile and then the utterly barren dirt and rocks beyond.

So in Tucson where I live we lightly irrigate several 50' heat happy trees with a nice canopy providing great shade. Next door, providing great morning shade for our backyard, is a 50' mesquite tree with upper branches at least 3' in diameter. No irrigation. In the alley behind our house is an old Palo Verde maybe 30' tall and it does a nice job shading the front part of the yard in the afternoon. Also no irrigation.

To sum up, lack of green cover is a choice, and I don't know but suspect people will value that more as things heat up ever so inexorably. The Sonoran summer sun is a mutherfucker, and shade helps a lot (but doesn't fix it).

You're welcome. Here's a link to a pro-alfalfa explainer:

https://www.azfb.org/Article/Understanding-the-Economics-of-...

It gets hilarious when it talks about water. I'll summarize: who cares about how much water growing alfalfa takes, it makes a lot of money.

The export number is very impressive!

We grow lots of cotton too.

Phoenix actually has plenty of water because of the Salt River. Tucson gets CAP water which just got whacked pretty hard in the Colorado River negotiations (20% CAP cut I think?) and I was surprised to learn that the City of Tucson has managed its water efficiency so well that nothing has to change much, price for instance.

If water supply does eventually require changes, the technically obvious and very easy change would be to reduce agriculture (pecans, alfalfa, cotton) by whatever amount is needed. Politically though, that's going to be fun. That agriculture is backed by Big Money.

The heat sucks, but the sun is very bright and my comfortable 75F house generally has a zero or small electrical bill because my roof is covered in solar panels.

The heat sucks hard for 3 months. The rest of the year is fucking glorious.

We moved to Tempe back around June 1987 and I had the summer off while the better half went to work. We moved from Gainesville, FL. One of us was raised in S. FL and the other GA. In Gainesville, we lived through the summers with an apartment and cars w/o AC. I worked in exterior renovation during one summer in Atlanta when it reached 100F regularly, and the summer after high school in S. FL installing attic HVAC metal ducts in new construction. So we thought we knew heat.

So I'm in the apartment in June and the complex has got a pool so like I'd always done I put the swimsuit on, grabbed a towel, and strode barefoot across the parking lot in the direction of the pool. It was probably 101F, nice day for June. About halfway across the lot I realized I was burning my (tough) feet. I'm a practical person and noticed the white stripes in the lot and ran to one. YUP! At least 20F cooler. Ever since I've wondered why you couldn't do something like that white paint for all the asphalt and concrete. Turns out you can. Hooray! I'm in Tucson now (it's currently 106F/22%). I'm out at 5AM for a bike ride many days and the lows have been steadily climbing over the past decades. Was 84F this morning, the lows increasing every day this week, YUK. When I ride out to the actual desert it gets noticeably cooler, maybe 5F. I want them to take this stuff and just coat the entire Tucson metro area with it.

[edited to add missing words]

Suppose I accede to every claim you make here. Where may I see the advantage in the long run, in any dimension? I'm willing to go with hearsay.

The word "dimension" is chosen to be so vague that you can surely do it. I would be easy to impress.

Stand on Zanzibar was so prescient it gave me goosebumps when I read it 5 years ago.

Ok, common-lisp newbie here.

Could you explain why Paul Graham's book "On Lisp" is wrong? Or misguided? Or misunderstood by newbies like me? 30 years of c++ with a lot of dealing with templates and I'm not feeling the mandatory function purity here.