np nanmean

Http://blog.csdn.net/crfoxzl/article/details/2192957 NP is a type of problem in which the correctness of the solution can be checked in polynomial time. For example, if the array summation result is used to obtain a solution, is this solution correct? Obviously, it can be verified within the polynomial time. For example, if a solution is obtained for the SAT, the correctness can be verified within the polynomial time. Therefore, sat and summation are

Sort it out. There must be something wrong. Please correct it. NP is a type of problem in which the correctness of the solution can be checked in polynomial time. For example, if the array summation result is used to obtain a solution, is this solution correct? Obviously, it can be verified within the polynomial time. For example, if a solution is obtained for the SAT, the correctness can be verified within the polynomial time. Therefore, sat and sum

Pis a class of deterministic Turing (hereinafter referred to as Turing) in polynomial time (Polynomial time) resolves problems within the collection.NPis a class that can be passed through a non-deterministic Turing (NOn-deterministic Turing machine) in polynomial time (Polynomial time) Resolves a set of decision issues within thePIsNP, which means that any problem that can be solved by a Turing in polynomial time can be solved by a non-deterministic Turing. Now, let's talk.NPThe most difficult

You will often see "how to do this? Isn't this an NP problem?", "this is only a search. It has already proved to be an NP problem. You need to know that the NP problem mentioned by most people at this time actually refers to the NPC problem. They do not understand the concept of NP and NPC.

The concept of P-problem, NP-problem, NPC problem and NP-hard problemLeave the job still have a few days, idle to Nothing, will be common but it is easy to confuse a few concepts to organize, hope to help you.You will often see the online "How do you do this, this is not NP problem", "This only search, this has been proved to be

P is a type of problem. They can find the certainty of a polynomial complexity.Algorithm.This means that, within a given limited resource (Computer), resources can use this algorithm to obtain a correct solution to the problem within a polynomial time. NP problems are more extensive than P problems. They are defined as a class of problems. They can find non-deterministic algorithms with polynomial complexity.P belongs to

Na,np,ie all day will be exposed to loopback interface, they in training, will learn from the book a lot about loopback, a lot of review outline will have a full page of paper will loopback the role of the interface summed up so that people can not help but want to back down.Linuxer will also come into contact with this interface, but in the name of more than the professional network management, they will call it lo, syllable less a few tones, but in

Concept: In computer science, there are a class of problems with polynomial time algorithms, which are called P-problems. For example, the question of the Vatican, the traveling problem of the salesman, and the question of the (Proposition expression) can satisfy the problem, so far, we have not found a class of problems solved by polynomial time algorithms, which are called NP problems. 　 Taking the salesman's travel question as an example, assume th

This may be one of the biggest mistakes of many oier. You will often see "how to do this? Isn't this an NP problem?", "this is only a search. It has already proved to be an NP problem. You need to know that the NP problem mentioned by most people at this time actually refers to the NPC problem. They do not understand the concept of

This may be one of the biggest mistakes of many oier.You will often see "how to do this? Isn't this an NP problem?", "this is only a search. It has already proved to be an NP problem. You need to know that the NP problem mentioned by most people at this time actually refers to the NPC problem. They do not understand the concept of

P,NP,NPC, this may be one of the biggest pitfalls of many oier.This article is for everyone to explain in detail as above three questions.Pre-order:You will often see the online "How do you do this, this is not NP problem", "This only search, this has been proved to be NP problem" and so on. As you know, the NP problem

This may be one of the biggest pitfalls of many oier.You will often see the online "How do you do this, this is not NP problem", "This only search, this has been proved to be NP problem" and so on. As you know, the NP problem that most people are talking about at this point actually refers to NPC. They did not understand the concept of

Just read "The beauty of mathematics", suddenly saw Bayesian network learning is NPC problem, and then in the brain recalled the difference between NP, NPC, and then read the wiki, others blog record as follows.—————— PrefaceThe following is transferred from Msn-spaceThis may be one of the biggest pitfalls of many oier.You will often see the online "How do you do this, this is not NP problem", "This only se

Future mathematician challengesComputing problemsYang zhaokun; Yang chongjunI. PrefaceIi. calculation amount3. P?Iv. guke's law and NP-CompletenessV. Approximate Solution of NP-complete ProblemsVi. np-hardness and goVII. ConclusionI. PrefaceSome mathematicians have said, "a good question is better than ten good answers 」. The answer is that this problem has reach

You will often see "how to do this? Isn't this an NP problem?", "this is only a search. It has already proved to be an NP problem. You need to know that the NP problem mentioned by most people at this time actually refers to the NPC problem. They do not understand the concept of NP and NPC.

I. OverviewRecall Euler loop problem, asked to find a path through each edge of the graph exactly once, the problem is linear solvable. The Hamilton Circle problem is to find a simple circle that includes each vertex of the graph. For this problem, no linear algorithm has been found yet.For the single source of the graph, there is also linear time solvable, but the shortest path problem (Longest-simple-path) has not yet found the linear algorithm.The change in these problems is actually worse th

Keywords: NP Problme; NP-hard Problem; NP-complete Problem; P Problem [Why write this article] talking about algorithms in zero order [Here are the symbols and formulas used in this series of articles.] Here we are talking about algorithm (outside of this article) symbol tagging and basic mathematical formulas. First, let's explain what is the

"P = NP ?" It is generally considered the most important issue in computer science. There isClay mathThe Institute, or even offered a reward of 1 million US dollars to the people who solve it. But what I want to tell you today is that this problem does not actually exist and does not need to be resolved at all. I am not the first person to think so. A mathematician pointed out very early that p = NP? I

A review of solving NP difficult problemsAbstract: define NP Problem and P class problem, and introduce some common NP problems, and some solution methods of NP problem, finally, the development direction of the most NP problem is prospected.Key Words: Optimization Problem o

What needs to be clear is that all the products on the market that are known as NP firewalls are not really NP firewalls, such as high-end X86 CPU architecture, multi-core CPU architecture firewall, in fact not a real NP firewall. The user must carefully carry on the actual test to the equipment. The test can be based on universal network test equipment such as s