language-agnostic

问题 I was wondering about the following questions: What does it mean "some language is a subset/superset of another"? Can it be defined in mathematics? Is it related to the subset/superset concept in elementary set theory? Are almost all existing languages implemented/written in some small number of low-level languages? For example, are most languages written in C? Is C++ written in C? Is there some relation between the implementation relation and the concept of subset/superset of languages? In

问题 I am trying to find the minimal bounding box of a 2d point cloud, where only a part of the point cloud is visible. Given a point cloud with a rough rectangular shape, clipped so that only one corner is visible: The point cloud is clipped at the green border. I know the position of the border in the image, and I know that there will always be exactly one corner of the rectangular shape visible within this border. I also know the size of the rectangular shape. Now I want to find the minimal

问题 The somewhat unclear question Exponential Graph Animation P5js Canvas contains an interesting detail about programmatically labeling axes for a broad variety of ranges. I instantly remembered that gnuplot does what I searched for. By interactively zooming in the preview window (and without any particular ticks specification), I observed that it automatically selects a labeling scheme with an amount of between 4 and 10 ticks and a fixed distance of 1, 2, or 5 times some power of 10. The

问题 C++0x specifies the std::atomic template for thread safe atomic access to variables. This template has, among others, a member function std::atomic::exchange that atomically stores a new value in "this" and retrieves the existing value of "this". Win32 has a similar function: InterlockedExchange Now, what these operations do is simple: atomic read-modify. What I do not understand is what the point of this operation is. The value read that is returned is "meaningless", because once I can

问题 I've been reading the book Clean Code: A Handbook of Agile Software Craftsmanship and in chapter six pages 95-98 it clarifies about the differences between objects and data structures: Objects hide their data behind abstractions and expose functions that operate on that data. Data structures expose their data and have no meaningful functions. Object expose behavior and hide data. This makes it easy to add new kinds of objects without changing existing behaviors. It also makes it hard to add

问题 The bounty expires in 14 hours . Answers to this question are eligible for a +200 reputation bounty. Peter O. is looking for a canonical answer : To summarize: Either (1) find a more efficient algorithm than the one implemented in the code, or (2) state the formula for the number of valid. combinations and how to "unrank" a combination number. Is there an efficient way to generate a random combination of N integers such that— each integer is in the interval [ min , max ], the integers have a

问题 The bounty expires in 14 hours . Answers to this question are eligible for a +200 reputation bounty. Peter O. is looking for a canonical answer : To summarize: Either (1) find a more efficient algorithm than the one implemented in the code, or (2) state the formula for the number of valid. combinations and how to "unrank" a combination number. Is there an efficient way to generate a random combination of N integers such that— each integer is in the interval [ min , max ], the integers have a

问题 I need to get notification success delivery. I read so many and tried. I have GSM modem ZTE K4510Z . I don't get any notification or save to sim card. In my tested. I though my sim card is broken. So I try AT+CMGW to write temporary message to simcard. It success and exist. So in the end I think, it's command not the simcard. I try so many think from AT+CNMI , AT+CPMS . None reply buffer I get after send a message. I check it too with AT+CPMS? after send message. If a message it write to

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . As I was writing another switch in Eclipse, I once again came across a rather weird (to me, at least) default indentation, which is

问题 I'm computing the result by colliding pairs of 2D convex objects (without rotation), using the basic equations on wikipedia. However, when there are dependencies, like two objects hitting another object at the same time: Such as here, with objects 1 and 2 hitting 3 at the exact same time, the pair-wise approach fails. Depending on the order I compute the collisions (1-3 first or 2-3 first), I will get different results. Repeated iteration through the collisions will still give order dependent