DNF2

14 ms·

91.
by DNF2 5y ago
You code in anger? How does that work:D? Anyway, Julia is my preferred language, and it has the depth to teach you widely useful concepts. For example, I'm now learning C++, and my Julia experience has been very valuable. Python, of co
92.
by DNF2 5y ago
I have never noticed them being bad for performance. Are you really sure?
93.
by DNF2 5y ago
"Any other PL"? Really? Well, that is news to me:) Anyway, the answer to your question is very simple: Because it's difficult, and a lot of work. Not because they can't be bothered, as your question seems to imply.
94.
by DNF2 5y ago
I think the point is that one wants to write code that is similar to regular non-performance sensitive python code, with classes and everything, and still have it be fast.
95.
by DNF2 5y ago
You mean the fact that someone submitted this on Hacker News? Yeah, sure, that was quite pointless. Submitting code to Benchmarks Game was fine, though.
96.
by DNF2 5y ago
I'd say most of those optimizations are not needed (`@inline`, `@ntuple`, `@inbounds` can also often be dropped). Vectorization, in the sense of using `.+` etc, does not provide any speedup in Julia, it is only for notational convenien
97.
by DNF2 5y ago
Isn't this mainly because the first run includes compilation? The compiled code should use little memory, if correctly written.
98.
by DNF2 5y ago
The Benchmarks Game isn't some Julia project, and it is unreasonable to blame the presentation of results on some 'chip on the shoulder' of Julia the language. The Benchmarks Game is a project that dates back to at least 2002
99.
by DNF2 5y ago
Yes, but not from C++, but from Julia source code. Or what are you referring to?
100.
by DNF2 5y ago
What is a "fixed-point float"? That sounds like a contradiction. And what sort of transfer function are you referring to?
101.
by DNF2 5y ago
The ;; is similar to the space, in that it separates elements in the second dimension. But they are not quite equivalent, because you cannot write [1;;2;3;;4]. With semicolons you have to start with the innermost dimension and work outwards
102.
by DNF2 5y ago
What? I mean, it's a solution to an unnecessary problem caused by indentation being significant. The problem wouldn't exist if whitespace wasn't significant, which was an unfortunate design choice. So it's a solution to
103.
by DNF2 5y ago
If you say so. I've never heard of either of those, and have only the vaguest idea of what a 'formatter' might be. Is it not a solution to an unnecessary problem? And how can a formatter fix a lost indentation that changes th
104.
by DNF2 5y ago
My problem has been that I sometimes lose indentation, by accident, and this can break or, worse, alter the behavior. It is also a nuisance when I want to copy-paste code from somewhere else, and it doesn't go smoothly. Once I needed t
105.
by DNF2 5y ago
To address the specific examples: [1,2,3,4] is literal vector creation, and also "," is just the regular way you create a list of inputs to a function. [1;2;3;4] is concatenation along the first dimension, so it must be the same a
106.
by DNF2 5y ago
The semicolon use is actually completely consistent, ";", ";;", ";;;" etc. do indeed refer to incrementation of the corresponding dimension. Try [1;2;3], then [1;2;3 ;; 4;5;6] and then [1;2;3 ;; 4;5;6 ;;; 7;8;9
107.
by DNF2 5y ago
Compilation times are still an issue, but what do you mean with 'increasingly slow' compilation times? As far as I know and can tell, compilation times have been getting faster not slower, and by a significant amount.
108.
by DNF2 5y ago
There is a big difference between a blog post and a scientific article. A blog post should be expected to popularize a topic and reach a wider audience. You also seem to be quite unfamiliar with breadth of the topic of mathematics. It is qu
109.
by DNF2 5y ago
I don't think those namings are inconsistent. primitive types and abstract types are not structs, and it would be misleading to label them as such. structs and mutable structs on the other hand are . So, using 'only struct'
110.
by DNF2 5y ago
Actually, callable structs are a common pattern in Julia, and are not in opposition to multiple dispatch. You are probably thinking of dot-method syntax, like this object.action()
111.
by DNF2 5y ago
There's some serious misunderstanding here. You do not have to disambiguate the function call, only the construction of the object. You would write m1 = TensorFlow.model() fit(m1, data) m2 = Pytorch.model() fit(m2, data)
112.
by DNF2 5y ago
Obviously, these code samples are meant only for aesthetic display, not for their pedagogical value. The criticisms being leveled by some here could be valid if their target had a different purpose. As it is, they miss the purpose and their
113.
by DNF2 5y ago
julia> [ (x,y) for x in 1:3, y in 1:x ] ERROR: UndefVarError: x not defined I think the reason for having x and y in different scopes like this is that if the range of y depended on the value of x, this wouldn't turn into
114.
by DNF2 5y ago
Are there multidimensional comprehensions in Haskell? In Julia you have jl> [ (x,y) for x in 1:3, y in 2:5 ] 3×4 Matrix{Tuple{Int64, Int64}}: (1, 2) (1, 3) (1, 4) (1, 5) (2, 2) (2, 3) (2, 4) (2, 5) (3, 2) (3,
115.
by DNF2 5y ago
Actually, come to think of it, Matlab is now fully jit-compiled. As long as you stick with double precision floats, there is already a "Matlab with fast loops": it's called Matlab! Just stay away from classes and other comp
116.
by DNF2 5y ago
If libraries use unicode in their internals, it doesn't affect you or me. And I have yet to see in the wild any examples of unicode identifiers that are required for use. The closest thing i can think of is the composition operator in
117.
by DNF2 5y ago
Cannot reply to deeply nested posts, so I put the answer up here: > This is not a necessity, but an implementation choice. The performance of Julia relies on algorithmic specialization, and since you do not know what input types your cod
118.
by DNF2 5y ago
> "like octave, but with fast loops" But the performance relies on the aggressive specialization which depends on multiple dispatch. And the adaptation to numerical computing, the cleanness and beauty is all about multiple di
119.
by DNF2 5y ago
> I'd prefer if the language only had a single number type > But if you talk about the general problem of naming functions differently according to their types, I feel that it's perfectly OK. You and I have nothing in common
120.
by DNF2 5y ago
Long variable names make mathematically oriented code unreadable. A short half-liner becomes a multi-line monstrosity. What you need to understand is that in mathematical code, the variables themselves are of secondary importance, while the

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