@[email protected]

@davidfowl How about open-sourcing the C/C++ runtimes in a similar way?

This is reminder that .NET has been open-source for the last 7 years 🧵: First the runtime. The JIT, type system, garbage collector, base class libraries (aka stdlib) are all here: github.com/dotnet/runtime

@gabrielpeyre The eigenvalues of DFT can only be 1,-1,i,-i because DFT^4 = id, splitting the vector space as a sum of four spaces of the same dim. It's about finding "nice" bases of those, which involves some kind of aesthetic reasoning as well.

Hermite functions form an ortho-basis of the continuous Fourier transform. Coming up with their discrete counterpart (discrete eigenvectors of the FFT) is surprisingly hard and apparently still mostly an open problem. arxiv.org/pdf/1501.07646…

@gabrielpeyre To be a little pedantic, you mean "discrete eigenvectors of the DFT", not FFT. For a vector to be an eigenvector of the discrete Fourier transform or not, it does not matter if one uses the fast or a slow Fourier transform.

@ekzhang1 Serious question: if it's a small service, would it be also possible in C, and if not why not? For instance, why can't memory safety be guaranteed by usual valgrind etc?

at work today: all of our users' web traffic is now being handled by a small service I wrote in Rust it is using like 1% of a CPU and went from 10,000 errors/hr to 0 errors/hr, so far here's to hoping that our problems are fixed

@fff_muc Wie cool 😎

Wir freuen uns zu verkünden , dass die #sportfreundestiller auf unserem globalen Klimastreik am 15.09. um 12 Uhr am Siegestor auftreten und für uns spielen werden. 🔥✊ Sei mit dabei 💚 📷 Ingo Pertramer

Unsere #Heimat ist zu schön, um sie verbrennen, vertrocknen, untergehen zu lassen. #Bayern kann mehr, als der Klimakrise zuzuschauen. Bayern kann die #Klimakrise bekämpfen. Wir wollen ein Land sein, das sich selbst eine gute Zukunft gibt! Das ist unsere Hommage an unsere Heimat.

@nyxtelius One can't re-assign references, unlike pointers.

C++ is the worst fucking language I’ve ever used. Why are references like that and not just non-nullable pointers semantically?

Wir dürfen nie vergessen, dass unser Wohlstand von den natürlichen Lebensgrundlagen abhängt. Jetzt muss es vordringlich darum gehen, das Klima zu stabilisieren. Die Zeit läuft davon. Was in diesen Jahren getan wird, entscheidet über das Klima für Jahrtausende.

Die Öffentlichkeit wartet auf die Entscheidung von Söder UND auf die Veröffentlichung der 25 Fragen und Antworten. Es geht um einen Minister! Die Öffentlichkeit hat ein Recht auf Transparenz

@KathrinAnna Bei der Gelegenheit vielleicht noch gleich beim DAV Summit Club vorbeischauen.

Die Alpen erhitzen sich fast doppelt so schnell wie der globale Durchschnitt. #Klimakrise Welche Auswirkung hat dies auf die Gletscher und Ökosysteme? Nach einem Treffen mit Wissenschaftlern der Glaziologie in München geht es jetzt auf die Forschungsstationen in die Berge.

Warum hat sich SPD-Chef Klingbeil eigentlich nicht darüber aufgeregt, als die FDP das Heizungsgesetz blockiert hat? Aber wenn die Familienministerin darauf besteht, dass die im Koalitionsvertrag versprochene #Kindergrundsicherung auch finanziert wird, dann macht die Sozialdemokratie nicht mehr mit.

Oh, what a non-surprise here. Unfortunately in 🇩🇪 Wirecard is still treated as a banking/finance scandal, not a counter intelligence failure.

@vzverovich I guess you mean "stack pointer". "Stack" doesn't even make sense ironically.

BREAKING: To improve safety and prevent stack overflow C++ programs will only run on processors without stack.

@Johann_v_d_Bron Oft sind unter Sozialdemokraten auch einfach viele Beton-Bürokraten, die Politik mit Verwaltung verwechseln, und nicht verstanden haben, dass Demokratie bedeutet, dass Politiker kommunizieren, erklären und überzeugen müssen.

@fermatslibrary Maybe better protect it and be a little careful with those CO2 emissions?

"Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there-on a mote of dust suspended in a sunbeam. The Earth is a very small stage in a vast cosmic arena. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves. The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand. It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known" ― Carl Sagan

@_onionesque Not sure about Wiener's lemma, but that L1(G) is a convolution algebra for any locally compact group is not very deep, see Folland's textbook. In the discrete case L1 = l1 ⊂ l2, but convolutions of l2 are no more l2. What periodic functions correspond to that l1 subset, is hard.

@MathiasFuchs10 Thank you for the very interesting comment! I should know this, but I don't. Is Wiener's lemma a good keyword for what you have in mind?

What are some problems in applied mathematics and engineering (apart from compressed sensing) where using the ℓ1 norm is actually useful? i.e. actually _does_ in practice what is claimed in theory.

@aryehazan @_onionesque One should add just one little word of caution about prob distributions not forming a vector space. One can embed them into a vector space but then there's a continuity question on the embedding.

@_onionesque Certainly as a distance between distributions its the most natural one, and enjoys various transformation invariance properties.

@JoshuaBarczak A std::queue does less than a std:: dequeue and that's exactly why it exists. Using it, people can be sure you don't push at the wrong end.

Ok C++ people.. help me understand why I should use std::byte, when std::uint8_t has the same size and can do more things (arithmetic, comparison operations, implicit conversion to wider types). What value does this thing add to compensate for its inflexibility?

PUBLIC SERVICE ANNOUNCEMENT: We are only at 1.3°C of global heating and the Earth is breaking down like crazy. 1.5°C was NEVER a safe level. But, thanks to fossil fuel industry lies and bribes, we are on track to blow past that and get to 3°C or more which will be hell on Earth