Viewing profile — rak1507

You won't get anything from vapourware salesmen.

It seemingly takes a long time to write good software too, co-dfns is infinity+1 years in progress...

There's a difference between one line and short/terse/elegant. {m:(x,x)#til x*x; r:til[x]-x div 2; 2(flip r rotate')/m} generates magic squares of odd size, and the method is much …

There aren't really any complicated arguments being made, so I don't think a proof would be that involved.

You definitely don't need to know any of that background to be able to arrive at the answer. To fully understand everything maybe, but all it takes is: a = x^1 + x^4 + x^7 + ... = …

Why not? All that is really required is knowing 1/(1-x) = 1+x+x^2+... and a bit of algebraic manipulation.

Isn't referencing a source exactly the right way to go about pointing out someone is essentially lying about their background/credentials? I'm surprised people do not care about ac…

I remembered it, and it seems like a reasonable assumption that your first experience of APL being so bad would put you off doing any more in the future.

Most of it is boilerplate or written like it is Java, so it is pretty small compared to any real world projects. To me professional implies production/real world/paid work, not jus…

Well, you've said you used APL professionally, but judging by https://news.ycombinator.com/item?id=31368299 it was in a university project.

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The append is the only thing that is O(1), finding the deletion mask is linear (≠ is linear, isn't it?) and the actual deletion is also linear (⌿ is also linear). ]runtime -repeat=…

The problem is that this isn't a "hashmap" in any meaningful sense, because all the operations are O(n).

When it comes to subjective opinions, what other choice do you have? Your idea of doing studies is interesting but that's not even been done for most languages, yet claiming "pytho…

I had a peek at your github profile, and noticed "sqlutilpy", "Python module to efficiently query SQL databases and return numpy arrays". K is like if a language just did that by d…

You have been talking about array languages on HN for at least 6 years, and still refuse to believe that anyone can read them! What do you have to gain from this stance, and why do…

Personally I think the best comparison would be Python+Pandas/polars+... or R+tidyverse+..., the key thing being there's less need for the "..." in a language with good table manip…

Do you mean f(x,n-1)^x or x^f(x,n-1)? With the first definition, c=1, the second, c=sqrt(2). I'm still not seeing the connection to omega.

What do you mean by x^x^x^... = 2? Isn't the solution to that sqrt(2)?

I don't know if there's a specific k4 binary but you can run k4 through the q binary.

It's k4, the underlying language behind Q. With slight modifications it also runs in ngn/k which is FOSS. https://ngn.codeberg.page/k/#eJxVjsFugzAMhu95iiyWik1CIGPtIVG...

What's so hard about Day 12? It's just +/'{x:".",x;H:(-1+;1+i-)@'+|\m*i:!#m:x=\:"#." R:(x=x)({[h;d;x;y;z](z#0),+\(((-z)_~"#"=x)&z_d>z)*(*y),(-z+1)_y-0^y h}. H)[x]/y (*|R)-R@*|0,&1_…

Again, I'm not saying anything is impossible to do, it's just about whether or not it's worth it. 2 or 3 lines for all types for all overloads for all primitives etc adds up quickl…