I wonder if one can delete a question after an answer is posted? mathematica.stackexchange.com/questions/171952/… I think this is rude. If someone spends time to answer, then deleting the question means the answer posted can no longer be seen and was all waste of time.

Why do users with Indian names tend to call others per "sir"? Is this a matter of education, politeness or a reflection of the native language in english?

@Kuba Supposedly it's related to social hierarchies and their adaptation to English as a working language.

Somewhat related: thenational.ae/world/…

@kirma makes sense. Hope this campaign will succeed :)

@Kuba And, yes, probably instilled to people at school, if nowhere else, when addressing teachers and so on.

But not really my area of expertise. :I

It seems somewhat comical from the perspective of flat-as-a-pancake social hierarchy country, but at the same time I would assume myself to appear either overly rude or lenient on a country where the hierarchy should be observed...

(As a reference point: I think I have never been in a formal enough occasion to address my professors by a title. I don't even know what kind of honorific I should use on other occasions, apart from a half-sarcastic "mister". And the spectrum of people I frequent go from unemployed half-bums to an odd billionaire, large-city politicians, MPs and occasional governmental ministers.)

@Kuba @kirma I find the "sir" equally disturbing and I already tried to figure out some time ago why that is. I came to the conclusion that for me personally, it definitely is because of all the spam I receive. Many of these start with "Dear Sir" and therefore, I find it disturbing to read it here :)

@halirutan :) I don't like it because for me Sir is a noble title and hardly anyone here has it :P But I am not a native speaker so I am fine with whatever I should think about this at the end :)

Sir can be used to good effect. Americans are great at it. The problem with the people you speak of is the way that they use it. At least that's my experience.

But one should note that when I say that they are great at it, it doesn't mean that I want any of that in Sweden. I think it works fine in the United States, but here everyone is at first name basis with everyone and there is no way to use honorifics or special pronouns... In India what they do probably works out great, just doesn't translate to the Internet. Just as you say.

@C.E. yeah, I was sad first time when no one was interested in my answer to 'how are you' :(

haha, yes :P

p.s. I used to write 'you' with capital letter because that is what you do in polish in official conversations/letters. A little related, though more my lack of education than with 'sir'.

@Nasser I always thought that answered questions simply could not be deleted. So it seems that is not the case?

@Szabolcs When can't I delete my own post?

So since there were no upvotes/accept, it was allowed.

@C.E. As in "Sir, would you please step out of the car and keep your hands where I can see them"?

Hello

Why does this command MatchQ[f[a][h], f[c][t] ___] return False?

ops.. it is not bold. the "c" has just one underscore, the "t" has two underscores

For once maybe someone will call me "sir" without adding "you're making a scene."

@apt45 What are you trying to achieve with ___f? I means a sequence of expressions having head f. It doesn't even make sense to use it in the head of another expression.

@apt45 If you meant multiplication, use f[c_][t__] _. instead (note that space before the _.).

@halirutan lol, but yes, I actually think that is one good usage.

@chuy lol

hello

was looking over this code here

mason.gmu.edu/~jtrichil/timeerror4

@Szabolcs Thank you. I thought ___ stands for "any sequence of expressions"

@user1740058 Which is MATLAB..

@apt45 Yes, but you had ___f, not ___. That is a sequence of expressions, all of which have head f.

Sorry thought I was in matlab room.

@apt45 Or did you mean to put a space between ___ and f?

looks like there is no matlab room

anyone know where I would go for matlab questions?

@user1740058 No problem. I hope there is a better way to create the Jacobian matrix than typing each entry manually.

@user1740058 StackOverflow, or MATLAB Answers. To look for chatrooms, also try StackOverflow, not this site. chat.stackoverflow.com

@user1740058 No specific MATLAB site on stackexchange.

Chatrooms are listed separately for each StackExchange site.

@Szabolcs I thought that __f requires the head to be f. With three underscores I thought the "space" was already considered

@apt45 What are you trying to do? If you are confused about some notation, I suggest you break down the example, and ask about each part separately.

thx

The example you posted is quite large and it's hard to explain why it works the way it does. Try to isolate the part you are confused about.

@Szabolcs This is what I want to do. The function f[] acts like a derivative and it's argument is a Lorentz index. I want to replace the expressions by performing integration by parts (such that no derivatives act on the object h) and dropping total derivatives. So, for example, given an expression like f[a][h] f[b][ f[c][g] ], I want to get -h f[a][ f[b][ f[c][g] ]]

OK, but what are you trying to pattern-match?

And why did you use ___f? ___f is BlankNullSequence[f] while ___ f (with a space) is Times[___, f].

Ok, I misunderstood the meaning of the ____ object

thank you

{___} matches any of {}, {1}, {a,b,c}

{___f} matches {} or {f[], f[1,2,3]} or similar, but all elements must have head f.

@halirutan Did you find out what broke completion in IDEA?

@Szabolcs No, I didn't look into this. I need to write M-Code myself to see what happens. I installed 2018.1.2 last night and just looked over the Function issue you reported.

I'm currently so loaded with work that I barely find some minutes to do some recreational things like playing BF or hacking on the plugin.

I'm not experienced with entities. I see that Wolfram Alpha know a lot about tilings, including a "primitive unit": wolframalpha.com/input/?i=hexagonal+tiling I can also see that it is possible to retrieve almost all this information through entities, e.g. EntityProperties[Entity["PeriodicTiling", "HexagonalTiling"]].

But the primitive unit is missing.

Even though W|A knows it: wolframalpha.com/input/?i=tiling+primitive+unit

Is there a way to retrieve the primitive unit of a tiling with entities?

@Szabolcs I think a question can be deleted even if there is an answer, as long as the answer has no votes on it. I've seen this before. You spend some time to answer a question, the OP takes the answer and quickly deletes the question and with it the answer before any votes come in. Not nice.