leprechaun1066

8 ms·

31.
by leprechaun1066 4y ago
K4 is the implementation language of q, kdb is the database part of the language. Most q is just named utility functions written in K4. There isn't really much difference in what the machine does with them under the covers, but when st
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by leprechaun1066 4y ago
The guy in charge of this for FTX is the same guy in charge of handling getting money back from the Enron collapse. He's currently testifying to congress about the state of things. It doesn't look good.
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by leprechaun1066 4y ago
q: {(,')over min[count each x]#'x} k4: {,'/(&/#:'x)#'x}
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by leprechaun1066 4y ago
Most queries to kdb+ do exactly what you are asking for.
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by leprechaun1066 4y ago
We stick with q as much as possible. We've found it's better for our front end developers who only touch it a bit here and there to make edits on the APIs they use. That said we do make heavy use of the functional form of querying
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by leprechaun1066 4y ago
> let's say I have a finance team that have never heard of it - why might they be interested? In my experience it's very good at quickly developing real-time analytics applications with only a small set of developers. A couple
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by leprechaun1066 4y ago
> so I was just curious if there were any array languages that would be approachable to me q is a very wordy language that sits on top of K4. Some open source examples of libraries used in finance: https://github.com/fino
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by leprechaun1066 4y ago
> the haters that parrot this old, barnacle-ridden trope: it's too powerful! Macros! Nobody can understand it but gods and strange people on the Internet! You will have to listen to these people constantly invade every forum, discus
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by leprechaun1066 5y ago
Also check out https://heredragonsabound.blogspot.com/
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by leprechaun1066 5y ago
> One can ask Lisp about all that then How? As in what commands/functions/macros? Say I define a function and compile with slime, how do I get the repl to print it back to me? And with a function I loaded from an external libra
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by leprechaun1066 5y ago
The big banks don't write code in K4 though, managers generally encourage people not to write code in it due to the difficulty of finding developers who are fluent in it. They all use q and q is very wordy and highly readable if you sp
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by leprechaun1066 5y ago
And easier to spot patterns in the source files. Whether someone finds that beneficial or not is subjective I guess, but I think it's useful to be able to immediately recognise what something like +/! is doing whenever you see it
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by leprechaun1066 5y ago
It's the sign of the number. -7 is negative so you get -1. 7 gives you 1 and 0 gives 0. ×-7 ¯1 ×7 1 ×0 0
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by leprechaun1066 5y ago
This usually happens when the developers in this situation are focusing (or are being forced to focus) on the tests over focusing on the solution to the actual problem in the product. TDD is just a development methodology which is a means t
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by leprechaun1066 5y ago
I am always fascinated by people complaining about decades old programming languages which are still alive and well. Some of those commenters seem to be trying really hard to prove APL and it's offspring are bad/wrong/etc., b
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by leprechaun1066 6y ago
> People use tenets for everything at AWS What is with all the cult/religious/military terminology turning up in software development these days? Squad, ritual, tenet; one day management will be asking us to remember to bring i
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by leprechaun1066 6y ago
> What is the consensus on forwarding any search "terms" to Google and then "scraping" the results back into the user - sort of a "proxy" search. Isn't this what DuckDuckGo does but with Bing?
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by leprechaun1066 6y ago
He basically said, "Everything that has a beginning has an end." But with way too many words.
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by leprechaun1066 6y ago
q has this out the box: https://code.kx.com/q/basics/peach/
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by leprechaun1066 6y ago
I take my photons medium-rare.
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by leprechaun1066 6y ago
99% of them are doing more than just not minding Melvin's issues, they're actively feeding off Melvin. Melvin is going to be (or is already) selling off what they have in stuff like FB, MSFT, AAPL, etc, and it's not the retai
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by leprechaun1066 6y ago
Friends and I used gather.town for a virtual New Year's Eve party since we were all in lockdown. It went really well.
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by leprechaun1066 6y ago
Chapel should just be removed from the game.
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by leprechaun1066 6y ago
The Knight Capital error really messed them up. https://www.reuters.com/article/us-knightcapital-results/kni...
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by leprechaun1066 6y ago
Lisp has April, which I thought was pretty cool. https://github.com/phantomics/april