theory

Cytoscape.js

天涯浪子 提交于 2019-11-27 13:38:49
Cytoscape.js Graph theory (network) library for visualisation and analysis 用于可视化和分析的图论 (网络) 库 https://js.cytoscape.org/ https://www.npmjs.com/package/cytoscape visualization & visualisation 可视化 visual, visualization, visualize, visible, visibility, visually, visualisation Graph theory https://en.wikipedia.org/wiki/Graph_theory https://www.javascripting.com/view/cytoscape-js https://blog.js.cytoscape.org/2016/05/24/getting-started/ 来源: https://www.cnblogs.com/xgqfrms/p/10068995.html

What is a scalar Object in C++?

本小妞迷上赌 提交于 2019-11-27 11:14:58
As far as I understand it fundamental types are Scalar and Arrays are aggregate but what about user defined types? By what criteria would I divide them into the two categories? struct S { int i; int j }; class C { public: S s1_; S s2_ }; std::vector<int> V; std::vector<int> *pV = &v; Short version: Types in C++ are: Object types: scalars, arrays, classes, unions Reference types Function types (Member types) [see below] void Long version Object types Scalars arithmetic (integral, float) pointers: T * for any type T enum pointer-to-member nullptr_t Arrays: T[] or T[N] for any complete, non

Where do I start learning about image processing and object recognition? [closed]

╄→гoц情女王★ 提交于 2019-11-27 10:57:12
I'm interested in writing some basic computerized object recognition application, so I figure I need some theoretical background in image processing algorithms, along with some AI for decision making capabilities. I'm a computer science graduate, and one day I plan to get my Master's degree, hopefully in one of these fields. In the mean time, I'd like to get a head start and do some self-learning. So my question is, where do I start? I'd appreciate an arrow in the right direction, a few links if possible. Ivan You may want to check out the answers to these similar question: Image processing

How do streaming resources fit within the RESTful paradigm?

耗尽温柔 提交于 2019-11-27 10:15:43
With a RESTful service you can create, read, update, and delete resources. This all works well when you're dealing with something like a database assets - but how does this translate to streaming data? (Or does it?) For instance, in the case of video, it seems silly to treat each frame as resource that I should query one at a time. Rather I would set up a socket connection and stream a series of frames. But does this break the RESTful paradigm? What if I want to be able to rewind or fast forward the stream? Is this possible within the RESTful paradigm? So: How do streaming resources fit within

Difference between user-level and kernel-supported threads?

偶尔善良 提交于 2019-11-27 10:03:53
I've been looking through a few notes based on this topic, and although I have an understanding of threads in general, I'm not really to sure about the differences between user-level and kernel-level threads . I know that processes are basically made up of multiple threads or a single thread, but are these thread of the two prior mentioned types? From what I understand, kernel-supported threads have access to the kernel for system calls and other uses not available to user-level threads. So, are user-level threads simply threads created by the programmer when then utilise kernel-supported

How a RegEx engine works [closed]

半腔热情 提交于 2019-11-27 09:51:48
问题 In learning Regular Expressions it had me wondering how the underlying engine works. Probably more specifically, I'd like to know more about how it evalutates, prioritizies and parses the expression. I feel the RegEx engine is a blackbox to me, and I would really enjoy deciphering it. So I'd like to ask if there are some great resources that I could read up on that discuss RegEx engine theory. *Note: I am not interested in building an engine, just learning the inner workings of it. 回答1: There

Is the time complexity of the empty algorithm O(0)?

坚强是说给别人听的谎言 提交于 2019-11-27 09:50:33
问题 So given the following program: Is the time complexity of this program O(0)? In other words, is 0 O(0)? I thought answering this in a separate question would shed some light on this question. EDIT: Lots of good answers here! We all agree that 0 is O(1). The question is, is 0 O(0) as well? 回答1: From Wikipedia: A description of a function in terms of big O notation usually only provides an upper bound on the growth rate of the function. From this description, since the empty algorithm requires

async await performance?

最后都变了- 提交于 2019-11-27 08:35:16
(Just a theoretical question - for non-gui apps) Assuming I have this code with many awaits : public async Task<T> ConsumeAsync() { await A(); await b(); await c(); await d(); //.. } Where each task can take a very short period of time , Question (again , theoretical) There could be a situation where the overall time dealing with all those "releasing back threads" and "fetching threads back" ( red & green here :) Is taking more time than a single thread which could done all the work with a small amount of delay , I mean , I wanted to be the most productive , but instead , since all those

Alternative Entropy Sources

自作多情 提交于 2019-11-27 06:41:09
问题 Okay, I guess this is entirely subjective and whatnot, but I was thinking about entropy sources for random number generators. It goes that most generators are seeded with the current time, correct? Well, I was curious as to what other sources could be used to generate perfectly valid, random (The loose definition) numbers. Would using multiple sources (Such as time + current HDD seek time [We're being fantastical here]) together create a "more random" number than a single source? What are the

How do I check if a directed graph is acyclic?

╄→гoц情女王★ 提交于 2019-11-27 06:09:51
How do I check if a directed graph is acyclic? And how is the algorithm called? I would appreciate a reference. FryGuy I would try to sort the graph topologically , and if you can't, then it has cycles. Doing a simple depth-first-search is not good enough to find a cycle. It is possible to visit a node multiple times in a DFS without a cycle existing. Depending on where you start, you also might not visit the entire graph. You can check for cycles in a connected component of a graph as follows. Find a node which has only outgoing edges. If there is no such node, then there is a cycle. Start a