Re: [Jchat] Tacit for 3 : '((,~ 0:) + (, 0:)) ^: (2^y) 1' ?

2&^ (,~ + ,)&0 1: Previous-generation interpreters allowed (illicitly) one to produce automatically tacit verbs equivalent to explicit one-liner verbs of this kind; alas, this is no longer possible because current-generation interpreters do not allow verbs to produce verbs (or rather it is a lot

Re: [Jchat] J according to ChatGPT...

> > Probably because it doesn't use a J session to test its "J expressions". > > > > (Intelligence which is not artificial would also struggle under such > > circumstances. Which, in turn, has significant economic implications: > > expertise which is never tested in

Re: [Jchat] J according to ChatGPT...

practical contexts tends to sound > good without being useful.) > > -- > Raul > > On Tue, Dec 6, 2022 at 3:37 PM Jose Mario Quintana > wrote: > > > > Human: What do you know about the J programming language? > > AI: I know that J is a concise high-level progr

[Jchat] J according to ChatGPT...

Human: What do you know about the J programming language? AI: I know that J is a concise high-level programming language designed to express complex algorithms in a few lines of code. As a functional programming language, J is well suited for data analysis, statistical computing, and machine

Re: [Jchat] p: the hard way

Indeed. From, FRACTRAN - Wikipedia https://en.wikipedia.org/wiki/FRACTRAN and RosettaCode Fractran http://www.rosettacode.org/wiki/Fractran#Tacit_version one can get (beware of line wrapping!), FRACTRAN=. {~ (1 i.~ (= <.)))@:* ::]^:)(`]))([`))(`:6) ( primes=. ('FRACTRAN'f.) ((1

Re: [Jchat] p: the hard way

Apparently, there is a formula for computing C as an infinite (limit) sum but it is a kind of a joke because involves the prime numbers, Analytic formula for the nth prime. · Issue #181 · leios/SoME_Topics · GitHub You might also be interested

Re: [Jchat] Was [Jprogramming] Tacit completeness

tep up > to cover those costs). > > > > It might very well be that there's a useful approach here. But it > looks like adequately specifying and documenting that approach would > not be easy. > > Thanks, > > -- > Raul > > On Thu, Dec 30, 2021 at 7:09 P

Re: [Jchat] Was [Jprogramming] Tacit completeness

───┼┼┤ │0 │0 │1│ └┴┴┘ ;A |domain error | ;A Again, I am just playing with the j807 DLL without a full installation. I hope it works for you. Good luck! On Thu, Dec 30, 2021 at 4:08 PM Raul Miller wrote: > > On Thu, Dec 30, 2021 at 2:54 PM Jose Mario Quintana >

Re: [Jchat] Was [Jprogramming] Tacit completeness

─┼─┤ │0│0│.│ └─┴─┴─┘ ;T |domain error | ;T On Thu, Dec 30, 2021 at 4:12 PM Raul Miller wrote: > > On Thu, Dec 30, 2021 at 3:10 PM Jose Mario Quintana > wrote: > > ( A=. 3 3 $ [: 1 (0) (0) (0)]: ) > > ┌┬┬┐ > > │1│0 │0 │ > > ├┼┼┤ > >

Re: [Jchat] Was [Jprogramming] Tacit completeness

> > justify, with mostly old arguments, why you refuse to play the game. Most > > j fans do not play it and there is absolutely nothing wrong with that, as > > far as I am concerned. > > > > :) > > > > > > > > > > > > > > On

Re: [Jchat] Was [Jprogramming] Tacit completeness

|4 |5 | > +-+-+-+ > |6 |7 |8 | > +-+-+-+ > > +-+-+-+ > |9 |10|11| > +-+-+-+ > |12|13 |14 | > +-+-+-+ > |15 |16 |17 | > +-+-+-+ > > +-----+-+-+ > |18 |19 |20 | > +-+-+

Re: [Jchat] Was [Jprogramming] Tacit completeness

This is what Jx does which in most cases is what official j8xx interpreters do. You could find out what the latter interpreters illegally do after running the wicked tacit toolkit holding your nose if necessary. [: + */ %/\ ]: ┌─┬──┬───┐ │+│*/│%/\│ └─┴──┴───┘ ": [: + */ %/\ ]: ┌─┬──┬───┐

Re: [Jchat] Was [Jprogramming] Tacit completeness

eem to > be not particularly obvious (but the implementation would still have > to deal with them). > > Do you see why I tried to phrase the discussion here in terms of costs > and benefits? > > Thanks, > > -- > Raul > > > -- > Raul > > On Wed, Dec 29, 2

Re: [Jchat] Was [Jprogramming] Tacit completeness

29, 2021 at 8:25 PM Raul Miller wrote: > > On Wed, Dec 29, 2021 at 8:09 PM Jose Mario Quintana > wrote: > > > My stance here is that *any* tool set necessarily is limited (aka > > > "weak") outside of a limited range of targets. For example: > > > ...

Re: [Jchat] Was [Jprogramming] Tacit completeness

e encountering this scenario -- you are basically I am glad you can see it now. On Wed, Dec 29, 2021 at 4:07 PM Raul Miller wrote: > > On Wed, Dec 29, 2021 at 3:20 PM Jose Mario Quintana > wrote: > > T

Re: [Jchat] Was [Jprogramming] Tacit completeness

freezing for a few seconds before vanishing completely. _____ On Tue, Dec 28, 2021 at 8:33 PM Raul Miller wrote: > > On Tue, Dec 28, 2021 at 6:27 PM Jose Mario Quintana > wrote: > > > > It keeps ta

Re: [Jchat] Was [Jprogramming] Tacit completeness

CRASH J ;) _____ On Tue, Dec 28, 2021 at 4:27 PM Raul Miller wrote: > > On Tue, Dec 28, 2021 at 1:42 PM Jose Mario Quintana > wrote: > > It keeps tacit adverbial and conjunctional programming weak. >

Re: [Jchat] Was [Jprogramming] Tacit completeness

sting here. I wrote most of a pattern matcher for them once, and > found it fairly natural. (Still need to finish it and extend it to a > term-rewriter, but.) Mind you, I do not have an academic computer science background. I have no idea what a term-rewriter is but I will look it up. &g

Re: [Jchat] Was [Jprogramming] Tacit completeness

t also anonymous and fixed... Good luck! On Sun, Dec 26, 2021 at 9:44 PM Jose Mario Quintana < jose.mario.quint...@gmail.com> wrote: > > > I meant to write the following a couple of days ago but the infamous virus stroke. Oh well, better late than never... > &

Re: [Jchat] Now it can be told!

ion about the name in Section 10.2 of *APL Since > 1978 <https://dl.acm.org/doi/pdf/10.1145/3386319>*. > > > > On Sat, Aug 21, 2021 at 1:01 PM Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > > > > Dr. Iverson recommended I read "The Boo

[Jchat] Was [Jprogramming] "accessor" concepts

Read the following within the context of [Jprogramming] "accessor" concepts (jsoftware.com) and [Jprogramming] ups & downs (jsoftware.com) The explicit

Re: [Jchat] Now it can be told!

s://dl.acm.org/doi/pdf/10.1145/3386319>*. > > > > On Sat, Aug 21, 2021 at 1:01 PM Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > > > > Dr. Iverson recommended I read "The Book of J” by Harold Bloom when I > was > > asking about t

Re: [Jchat] Now it can be told!

> > On Sat, Aug 21, 2021 at 4:01 PM Jose Mario Quintana > wrote: > > > > > Dr. Iverson recommended I read "The Book of J” by Harold Bloom when I > was > > asking about the name he chose for his programming language. > > > > > > &

Re: [Jchat] Now it can be told!

> Dr. Iverson recommended I read "The Book of J” by Harold Bloom when I was asking about the name he chose for his programming language. > Perhaps it was an instance of telepathy since, ' I studied this interpreter for about a week for its organization and programming style; and on Sunday,

Re: [Jchat] Most Impressive Mathematician Gravesite.

Ibn Sina (Avicenna) has an entry at, Avicenna (980 - 1037) - Biography - MacTutor History of Mathematics (st-andrews.ac.uk) and his mausoleum is not unimpressive (take your time), Avicenna Mausoleum - موزه ابوعلی سینا *NO ANY REUSED

Re: [Jchat] Chain Reaction

-Pieter That seems to be a useful full-blown server. @Raul and Skip I remember that you mentioned that project some time ago but this puts it in a new perspective (to me). On Tue, Apr 6, 2021 at 10:54 PM Jose Mario Quintana < jose.mario.quint...@gmail.com> wrote: > Excellent! Thank you. &

Re: [Jchat] Chain Reaction

rocesses, or 19 if I want to be able to do anything else on the machine > while they are running. > > What I've done is coarse-grained parallelism. Note that Marshall Lochbaum > presented a fine-grained approach at the 2012 J conference that is > complementary to this but I have not joi

Re: [Jchat] Chain Reaction

t does give significant performance > improvement. It's very simple but works well enough on multi-cores that > I've never been motivated enough to try to improve it. > > On Tue, Apr 6, 2021 at 7:47 PM Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > > > &g

Re: [Jchat] Chain Reaction

ver/fork'" >2 >2 > > echoing 2 twice, from the two J processes, before they both exit. > >[ F. (echo bind 2) '' > > echoing 2 until interrupted. > > > Practical, non-destructive use fork probably has a bunch of caveats, > but it does also in C pro

Re: [Jchat] Chain Reaction

(which people almost never use, nowadays, because we have long since > learned to expect distributed programs to be well behaved). > > Take care, > > -- > Raul > > On Wed, Mar 31, 2021 at 6:39 PM Jose Mario Quintana > wrote: > > > > For some reason, probably the

[Jchat] Chain Reaction

For some reason, probably the pandemic, recent posts regarding the verb fork_jtask_ evoked old memories. In the late '70s, while reading a passage in a book describing Von Newman's scheme for constructing self-replicating machines, I realized I could design a self-replicating process capable of

Re: [Jchat] d3 dashboard

Regarding COVID-19 graphic information, these are my favorite sites/pages: https://coronavirus.1point3acres.com/en/world interactive) https://public.flourish.studio/visualisation/2562261/ (interactive) https://www.visualcapitalist.com/history-of-pandemics-deadliest/ (dynamic) On Sun, Nov 8,

Re: [Jchat] d3 dashboard

> I cannot resist: A fool with a tool is still a fool. It could be fun though, https://xkcd.com/688/ ;) On Sun, Nov 8, 2020 at 9:58 AM R.E. Boss wrote: > > > > R.E. Boss > > > -Original Message- > From: Chat On Behalf Of Raul Miller > Sent: zondag 8 november 2020 14:34 > To: Chat

Re: [Jchat] Notation for programming language specification

> That said, it's also wise to keep in mind some weaknesses of the J> community. One of which is that we're not really capable of taking on > real time programming tasks (neither is Racket, because of its garbage > collection algorithm). You need a language where garbage collection > can be

Re: [Jchat] Introducing J to Financial & Actuarial Students

> > satin shorts. > > > > "Limited edition short shorts now available," CEO Elon Musk tweeted on > > Sunday. > > > > Donna Y > dy...@sympatico.ca > > > > On Feb 3, 2020, at 7:30 PM, Jose Mario Quintana > > wrote: > >

Re: [Jchat] Introducing J to Financial & Actuarial Students

gt; > expiring shortly after that date. > > > > On Fri, Jan 31, 2020 at 6:09 PM Jose Mario Quintana < > > jose.mario.quint...@gmail.com> wrote: > > > > > > Yes, I lost a bit dumping it when it started to take off. > > > > > > Oh well,

Re: [Jchat] Introducing J to Financial & Actuarial Students

asy: buy out-of-the-money puts, based on today's price, > expiring shortly after that date. > > On Fri, Jan 31, 2020 at 6:09 PM Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > > > > Yes, I lost a bit dumping it when it started to take off. >

Re: [Jchat] Introducing J to Financial & Actuarial Students

rted to take off. > > > On Thu, Jan 30, 2020 at 7:36 PM Donna Y wrote: > > > > > >> Tesla short sellers lose more than $1.5 billion in one day as stock > > skyrockets on earnings > > > > Donna Y > > dy...@sympatico.ca > > > > &

Re: [Jchat] Introducing J to Financial & Actuarial Students

> Full disclosure: I have a short position on Tesla. I trust you dumped your short position in a timely fashion: July 25 $222.82; today $640.81 :) On Thu, Jul 25, 2019 at 1:31 PM Devon McCormick wrote: > > Actually, "Ponzi scheme" is inaccurate - it's more of an accounting scam. > Full

Re: [Jchat] Robert (Bob) Godell Brown

> It is unlikely that there were two Robert Godell Browns claiming to have invented Exponential Smoothing! He was an amazing guy. (+/%#)&.(a.) 'Robert Godell Brown' _ :) On Tue, Dec 10, 2019 at 3:32 PM 'Jim Russell' via Chat wrote: > > Same one. I spent some 10 years working with Bob on

Re: [Jchat] geometric intuition

> > When we presented Tao with our result, he cheerfully declared that it was, in fact, the discovery of a new identity, and he provided several mathematical proofs, which have now been published online "There is nothing new under the sun." One cannot be too careful when claiming novelty... 18

Re: [Jchat] geometric intuition

13 November, 2019 at 1:52 pm Anonymous Why do you say that eigenvectors are determined by eigenvalues? For example, for symmetric matrices you still do not know n-squared plus or minus signs of the coordinates. Isn’t finding the signs almost as hard to finding eigenvectors themselves? 13

Re: [Jchat] The stockmarket is now run by machines.

Thu, Oct 17, 2019 at 11:09 AM Raul Miller wrote: > > On Wed, Oct 16, 2019 at 8:09 PM Jose Mario Quintana > wrote: > > Are there any takers for going cold turkey for a week? > > Sounds like a family vacation. > > (Last one was at a cabin (in oregon) with no cell towers in

Re: [Jchat] The stockmarket is now run by machines.

> We happily use the machines and do not think about the people that lost > their jobs to them. One the one hand, the Luddites tried to destroy the machines two centuries ago but they ultimately failed. Neo-Luddites are trying their best regarding modern technology now; but, the (lack of)

Re: [Jchat] the advantage of J

"Cada cabeza es un mundo" (Each mind is a world unto itself)... See Order of Operations in, Introduction to I https://github.com/mlochbaum/ILanguage/blob/master/doc/introduction.md On Fri, Sep 27, 2019 at 3:53 PM Devon McCormick wrote: > Are you serious? I attended a talk by Bjarne

Re: [Jchat] the advantage of J

An actuary, an accountant, an old lady, and a beautiful blonde find themselves together on a train. The train passes through a tunnel and in the darkness a loud slap is heard. When out of the tunnel and in the light, they see that the accountant has a red five fingermark on his cheek. The blonde

Re: [Jchat] Introducing J to Financial & Actuarial Students

, by actually exhibiting a trading strategy capable of producing risk-adjusted excess returns consistently, in real-time with real money); to me, all the rest is mostly useless, at best. On Mon, Sep 16, 2019 at 11:23 AM Raul Miller wrote: > > On Sun, Sep 15, 2019 at 1:01 PM Jose Mario Quinta

Re: [Jchat] Introducing J to Financial & Actuarial Students

> That would take us from essentially no chance of payout to an > exceedingly infinitesimal chance of payout. > > Thanks, but no thanks, > > -- > Raul Another one (that does not beat a market and instead) bites the dust! On Thu, Sep 12, 2019 at 10:56 AM Raul Miller wro

Re: [Jchat] Introducing J to Financial & Actuarial Students

...@sympatico.ca > > > > On Sep 11, 2019, at 11:15 AM, Raul Miller wrote: > > > > On Tue, Sep 10, 2019 at 7:53 PM Jose Mario Quintana > > wrote: > >> Raul wrote, > >>> Significant SAT-3 problems involve more than clause. > >> > >

Re: [Jchat] Introducing J to Financial & Actuarial Students

sing WebBroker? > > > P.S. Do not forget to let us know what happens. > > Are you sharpening your market programming skills yet? > > On Wed, Sep 11, 2019 at 11:15 AM Raul Miller wrote: > > On Tue, Sep 10, 2019 at 7:53 PM Jose Mario Quintana > wrote: > > Raul

Re: [Jchat] Introducing J to Financial & Actuarial Students

wrote: > > On Tue, Sep 10, 2019 at 5:40 PM Jose Mario Quintana > wrote: > > Recall, according to the paper, one only needs to place simultaneously two > > OCO-3 orders (apart from other assumptions not necessarily related to OCO > > orders) to program a market and test

Re: [Jchat] Introducing J to Financial & Actuarial Students

but from my notes one of the topics that he discussed was exchange systems. His examples were gift, barter, bitcoin and speculation on what the next exchange system may look like. That is the limit of detail on my notes. > > > > Cheers, bob > > > > > On Sep 5, 20

Re: [Jchat] Introducing J to Financial & Actuarial Students

ity! Maybe you can go ahead and program the market using *WebBroker*? P.S. Do not forget to let us know what happens. On Tue, Sep 10, 2019 at 10:50 AM Raul Miller wrote: > > On Mon, Sep 9, 2019 at 7:36 PM Jose Mario Quintana > wrote: > > I am sorry but circuit breakers are desig

Re: [Jchat] Introducing J to Financial & Actuarial Students

decreases by 10%"); there is nothing there to interfere or regulate OCO orders during typical market sessions. Would you like to try again? On Mon, Sep 9, 2019 at 10:47 AM Raul Miller wrote: > > On Sun, Sep 8, 2019 at 4:30 PM Jose Mario Quintana > wrote: > > Good idea, they are,

Re: [Jchat] Introducing J to Financial & Actuarial Students

twice over in different words, generally considered to be a fault of style (e.g. they arrived one after the other in succession). > > • [count noun] a phrase or expression in which the same thing is said twice in different words. > > • Logic a statement that is true by neces

Re: [Jchat] Introducing J to Financial & Actuarial Students

, Sep 5, 2019 at 6:24 PM Jose Mario Quintana > wrote: > > No, that rules against a dealer canceling a customer's *executed* order (except > > under certain circumstances); nowhere there is anything prohibiting > > "OCO" (contingent) > > orders. > > > &g

Re: [Jchat] Introducing J to Financial & Actuarial Students

Hi Bob, Many thanks for your feedback. Raul confirmed that, alas, there is no related J code. P.S. I hope newbies enjoy your videos as much as I do; ironically for someone that likes to read and write tacit code, I really learn by looking at examples (and I would be totally lost without an

Re: [Jchat] Introducing J to Financial & Actuarial Students

wrote: > On Wed, Sep 4, 2019 at 6:38 PM Jose Mario Quintana > wrote: > > Can you name a single regulator, the specific regulation, and the > > jurisdiction where the regulation prohibiting "OCO" applies? > > Are you asking about > > https://www.nf

Re: [Jchat] Introducing J to Financial & Actuarial Students

> From that amuse bouche: > > The result of this paper is that these two questions are linked > > No such thing was proven or even shown to be plausible. > Right (as far as I can see). By the way, your recollection was correct. I have been puzzled by all the fuzz about this famous (or

Re: [Jchat] Introducing J to Financial & Actuarial Students

Donna wrote: > The converse of "If it rains, then they close the windows" is "If they close the windows, then it rains.” > > Raining induces people to close windows but closing windows doesn’t induce it to rain. > > You need to prove both P and Q directly because the converse of P then Q is not

Re: [Jchat] Introducing J to Financial & Actuarial Students

Earlier in this thread, I wrote: > Markets are efficient -> (P = NP) > > "But we need to make one other assumption that is currently not standard in modern markets: we need to allow participants to place order-cancels-order (“OCO”) or one-or-the-other orders. These are orders on different

Re: [Jchat] Introducing J to Financial & Actuarial Students

> Ok I looked this up: ... > a discrete-time martingale is a discrete-time stochastic process (i.e., a Right, I was referring to a martingale sequence in the context of the weak-form of the EMH. The weak-form information refers to technical analysis which, usually, is based on historical

Re: [Jchat] Introducing J to Financial & Actuarial Students

> > Jose makes a good point though—if the author was trying to disprove > > efficient market hypothesis—then proving the weakest form to be false > > implies all forms are false. > > But, technically, the author didn't prove EMH false -- he outlined an > equivalence between EMH and the knapsack

Re: [Jchat] Introducing J to Financial & Actuarial Students

er wrote: > > On Wed, Aug 21, 2019 at 7:44 PM Jose Mario Quintana > wrote: > > I do not recall asserting that any particular form of the EMH holds. Do > > you? > > As you pointed out today: > > > Recall, the information related to the three forms is nested: > > &

Re: [Jchat] Introducing J to Financial & Actuarial Students

s that such a market is inherently more risky than a > Gaussian market. The variability of a given expected yield is higher in a > stable Paretian market than it would be in a Gaussian market, and the > probability of large losses is greater. > > > > This is the rather convoluted

Re: [Jchat] Introducing J to Financial & Actuarial Students

per" and in which section of the paper is made? Are you still trying to figure out in which section is "the argument made in that paper"? Come on, it is not that hard. Is it? On Sun, Aug 18, 2019 at 9:25 AM Raul Miller wrote: > On Fri, Aug 16, 2019 at 6:38 PM Jose Mario Quintana >

Re: [Jchat] Introducing J to Financial & Actuarial Students

> It was Fama who idea posited that it is virtually impossible to consistently beat the market The idea that one cannot beat the market can be traced back, at least (and probably even earlier), to Louis Bachelier who in his Théorie de la Spéculation dissertation (1900) wrote "the mathematical

Re: [Jchat] Introducing J to Financial & Actuarial Students

9 at 6:17 PM Raul Miller wrote: > > > On Fri, Aug 9, 2019 at 7:22 PM Jose Mario Quintana > > wrote: > > > :D I was even quoting from the paper. > > > > You get a gold star. > > > > But how can I talk about what the paper says with you, when you are

Re: [Jchat] Introducing J to Financial & Actuarial Students

t; That's a mix of the argument made in that paper with my observations > on how things typically work. Still, can you specify which is the particular "argument made in that paper" and in which section of the paper is made? On Sun, Aug 11, 2019 at 6:17 PM Raul Miller

Re: [Jchat] Introducing J to Financial & Actuarial Students

; destroyed billions of dollars in stock value from a forecaster who drops > his pants in public to get attention." > > > Donna Y > dy...@sympatico.ca > > > > On Aug 9, 2019, at 7:09 PM, Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > >

Re: [Jchat] Introducing J to Financial & Actuarial Students

just claims "markets are probably not efficient;" but you go further "even weak form market efficiency seems highly implausible." What do you mean by "highly implausible"? Where exactly in the paper is the evidence that supports your claim? (Can you at least mention the se

Re: [Jchat] Introducing J to Financial & Actuarial Students

dy...@sympatico.ca > > > > On Aug 6, 2019, at 6:11 PM, Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > > > > "That's not what it says." > > > > Really? Be that as it may, meanwhile you have not shown a single > inst

Re: [Jchat] Introducing J to Financial & Actuarial Students

ts (as Wm implied). On Fri, Aug 2, 2019 at 12:13 PM Raul Miller wrote: > On Thu, Aug 1, 2019 at 6:11 PM Jose Mario Quintana > wrote: > > "But note that, for example, they might be trumped by unregulated > > trading activities." > > > > Right, but rememb

Re: [Jchat] Introducing J to Financial & Actuarial Students

t 11:41 AM Raul Miller wrote: > On Tue, Jul 30, 2019 at 6:32 PM Jose Mario Quintana > wrote: > > Meanwhile, technical trading strategies have been, and most certainly are > > still, applied (once I heard a long time ago a banker mentioning the > > ubiquitous morphing s

Re: [Jchat] Introducing J to Financial & Actuarial Students

on, so I've far less information than you on this issue..." Well, you can try to google the subject; besides, there are links in that article (to the NYT, WSJ, and Wikipedia). On Mon, Jul 29, 2019 at 6:39 PM Raul Miller wrote: > On Mon, Jul 29, 2019 at 6:20 PM Jose Mario Quintana

Re: [Jchat] Introducing J to Financial & Actuarial Students

trading record. On Mon, Jul 29, 2019 at 11:06 AM Raul Miller wrote: > On Fri, Jul 26, 2019 at 6:15 PM Jose Mario Quintana > wrote: > > "I'll retract Musk as an example, and offer Jeff Bezos instead." > > > > Bezos (or Musk) as some form of the EMH coun

Re: [Jchat] The shrinking J holders

ithus.com > > (assuming this makes it past spam filters.) > > -- > Raul > > On Friday, July 26, 2019, Jose Mario Quintana < > jose.mario.quint...@gmail.com> > wrote: > > > ? > > > > On Fri, Jul 26, 2019 at 3:17 PM Raul Miller > wrote: > > >

Re: [Jchat] The shrinking J holders

AM Raul Miller > wrote: > > > > > > On Thursday, July 25, 2019, Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > >> > >> Did you notice the ";)"?

Re: [Jchat] Introducing J to Financial & Actuarial Students

"I'll retract Musk as an example, and offer Jeff Bezos instead." Bezos (or Musk) as some form of the EMH counterexample? Instead, I would like to offer the record of an incredibly talented young woman who fearlessly traded futures commodity markets for just ten months and produced an

Re: [Jchat] The shrinking J holders

.org/wiki/Clarke%27s_three_laws > > And to ponder, the rate of change seems to keep increasing. ;-) > > - joey > > > On 2019Jul 25, at 15:53, Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > > > > Did you notice the ";)"? (One never know

Re: [Jchat] The shrinking J holders

Did you notice the ";)"? (One never knows though.) On Thu, Jul 25, 2019 at 11:49 AM Raul Miller wrote: > On Wed, Jul 24, 2019 at 5:51 PM Jose Mario Quintana > wrote: > > I am looking forward to a suitable ring. ;) > > Some issues there include: > > (1) Ho

Re: [Jchat] Introducing J to Financial & Actuarial Students

The aphorism "all models are wrong, some are useful" has been mentioned twice recently without naming the author and neither will I. However, this is a hint: he also wrote the song "There is no theorem like Bayes' theorem." On Thu, Jul 25, 2019 at 1:04 PM Devon McCormick wrote: > EMH is a

Re: [Jchat] The shrinking J holders

nal Message- > From: Chat On Behalf Of Jose Mario > Quintana > Sent: Thursday, 25 July 2019 7:51 AM > To: c...@jsoftware.com > Subject: [Jchat] The shrinking J holders > > The following infamous (famous) benchmark, > >timex '%. 1000 1000 ?@$ 0' > 18.8179 > >

Re: [Jchat] Introducing J to Financial & Actuarial Students

" I believe Pépé has an advanced degree in actuarial science " Actually, my undergraduate degree is in Actuarial Science; my graduate degrees are in related fields (an MS in Statistics and OR, and a PhD in (Bayesian) Statistics). I am pretty sure I am not the only actuary which is also a member

Re: [Jchat] Introducing J to Financial & Actuarial Students

" Once upon a time (not long ago), Econ 101 taught about 'the efficient market hypothesis'. " At least since 1980 the academia recognized the obvious: if the markets are efficient there is no incentive for traders to be active; thus, relevant information is not assimilated by the markets and

[Jchat] The shrinking J holders

The following infamous (famous) benchmark, timex '%. 1000 1000 ?@$ 0' 18.8179 might not seem very impressive (to say the least)... Unless it is put in context: In the 80's I carried J with me via a laptop in a briefcase, in the 90's via a Hewlett-Packard 200LX in my pocket, in the 00's via

Re: [Jchat] TABULA announcement and request

" Whether it does or not, a British Columbia-based firm called Carbon Engineering has built a plant to capture CO2 from the atmosphere, at a cost of <$100 per metric ton (100 USD/t). " The video at the link, Bill Gates and Big Oil back this company that’s trying to solve climate change by

Re: [Jchat] TABULA announcement and request

ature and > > >> composition. The ocean temperature and composition. But there are many > > >> other variables. We don't even know what they may be. > > >> > > >> On Sat, Jun 22, 2019 at 1:24 AM Björn Helgason > > wrote: > > >> > > >>> https:/

Re: [Jchat] TABULA announcement and request

e following day). > > Come to think of it, nobody ever explained to me where the Garden Of Eden > > actually was – or where it disappeared to after the Fall. > > :-D > > > > > > On Fri, 21 Jun 2019 at 00:35, Jose Mario Quintana < > > jose.mario.quint...@gm

Re: [Jchat] TABULA announcement and request

" Science is only ever 'settled' in the sense of "it looks stable for now". " The following is a translation of what was reportedly written around 1,000 years ago: *The duty of the man who investigates the writings of scientists, if learning the truth is his goal, is to make himself an enemy of

Re: [Jchat] J and future coding practices

rsion of J running on multiple computers in a chip, with no clocks, tantalizing. On Thu, Jun 20, 2019 at 9:59 AM Raul Miller wrote: > On Wed, Jun 19, 2019 at 7:51 PM Jose Mario Quintana > wrote: > > The GreenArrays chips look very interesting. > > I am pleased that someone here, besides my

Re: [Jchat] TABULA announcement and request

" '…if controversies were to arise, there would be no more need of disputation between two philosophers than between two calculators. For it would suffice for them to take their pencils in their hands and to sit down at the abacus, and say to each other […]: Let Us Calculate.' I share that

Re: [Jchat] J and future coding practices

The GreenArrays chips look very interesting. They claim that it would not be difficult to support C. Consequently, a version of J would run either directly or indirectly; then again, that is easy to say if one is Chuck Moore. The evaluation kit seems affordable; but, I am afraid, the

[Jchat] Revisiting the Y combinator

In the post, [Jprogramming] Revisiting the Y combinator http://www.jsoftware.com/pipermail/programming/2018-November/052193.html I wrote, The non-tacit version of Y is a transcription of a wicked tacit version which I produced using a fork of J which should not be mentioned in

Re: [Jchat] J, APL, or calendars?

ds, I saw > >NB. That is, Lucy (either sane or insane) is a vampire and > >NB. Minna (either sane or insane) is a human > > And presumed that that was meant to represent your result set. > > Thanks, > > -- > Raul > > On Tue, Jun 12, 2018 at 11:04 AM Jose M

Re: [Jchat] J, APL, or calendars?

Friday night I decided to try to fall asleep by thinking about the puzzle and I thought I had solved it. This evening I wrote a wicked script to verify my thought process and I got the same result but it does not seem to match your conclusion. This is what I found... *** POTENTIAL SPOILER

Re: [Jchat] J, APL, or calendars?

wrote: > > > On 6/4/18, Jose Mario Quintana wrote: > > > Harvey wrote: > > >> It's just the way it is. > > > > I merely intended to inject some reality. Despite all of the > > discussions and arguments pro and con for various perspectives, > > n

Re: [Jchat] J, APL, or calendars?

how many days have elapsed? Can you show us how to perform the calculations in J? On Mon, Jun 4, 2018 at 11:59 PM, PR PackRat wrote: > On 6/4/18, Jose Mario Quintana wrote: > > Harvey wrote: > >> It's just the way it is. > > I merely intended to inject some reality

Re: [Jchat] J, APL, or calendars?

Harvey wrote: > BC AD > 3 2 1 1 2 3 > > Or, using a numerical approach (negative dates for BC): > -3 -2 -1 1 2 3 > Dec. 31, 1 BC was followed by Jan. 1, 1 AD (in our terminology). It's > a world standard. It's just the way it is. "The way it is" unfortunately introduced,

Re: [Jchat] J, APL, or calendars?

Donna wrote: > Dionysius invented the Anno Domini era about 525 C.E. > ... > He stated Jesus’ birth as 525 years ago without saying why Do you have a reference? This seems to be, at least, controversial; see, Anno Domini https://en.wikipedia.org/wiki/Anno_Domini#History Thus Dionysius

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