1, double Java.lang.Math.floor (double A)Returns the maximum double value (closest to the positive infinity direction) of an integer that is less than or equal to the parameter A in a mathematical sense, special case:If the parameter value equals a mathematical integer, the returned result is the same as the parameter valueIf the parameter is Nan (non-numeric) or infinity or +0 or-0, the return value is the
The following code is a floating-point number divided by 0:
float f1=1;
float f2=0;
float f3=f1/f3;
When you see the code above, you may suddenly think of an exception: Dividedbyzeroexception. If these numbers are integers now, they do, but! These are floating-point numbers and do not produce an exception.
In fact, floating-point arithmetic never produces an exception, because F2 is not really 0, it's just a very close to 0 number (how many?). In this case, the F3 equals a special value. It is
can detect it through the isNaN () method of the Global object (Gobal). Two Nan howeverValues are not mutually equal. The following example://---------------------------------------------------------Operation and detection of Nan//---------------------------------------------------------VarV1 = ten * ' A ';V2 = ten * ' A ';Document.writeln (isNaN (v1));Document.writeln (isNaN (v2));Document.writeln (v1 = = v2);
The Infinity of Global Objects (Gobal)
#define INF 0x3f3f3f3f
0x3f3f3f3f decimal is 1061109567, that is, 10^9 level (and 0x7fffffff (32-bit int maximum) an order of magnitude), and the general situation of the data are less than 10^9, So it can be used as infinity without the case that the data is larger than infinity.
On the other hand, since the general data is not greater than 10^9, when we add infinity
earlier versions, CISCO X25 adopts its own standard Encapsulation Format by default. The encapsulation Format of the Huawei router is the international standard IETF. Therefore, in order to communicate with each other, you need to change the encapsulation Format of the CISCO router to the ietf format by using the command: encapsulation x25 ietf
2. Huawei VRP1.1 and later versions have specially added CISCO-compatible encapsulation formats. In this way, you do not need to change the CISCO Encaps
-my Mac is ABCD. ABCD. ABCD
Layer-3 Address Resolution of broadcast media: Remote or local L2 MAC address and remote L3 Address binding
Local fr dlci and remote IPv4 address binding
Remote ISDN phone and original power IPX Address binding
-Reverse ARP parses the remote layer-3 address to the local layer-2 address
-Only directly connected devices can be parsed.
Nbma port type:
Multi-Point interface-connection to multiple L2 links resolution from L3 to L2
define the sites that can be directly connected to other sites. You only need to pay a small fee for PVC connection each month.
For frame relay, you should also know other related terms:
◆ LMS: Local Management Interface (LMS), which is the Management protocol for Frame Relay. LMIS is sent to communicate with the vswitch about what DLCI is available and whether the network is congested.
◆ DLCI: Data Link C
The following error was found in the log at the first node of the rac inspection instrument: LMS8: 7888 GCSshadowstraversed, reported: 7957 GCSshadowstraversed, reported: 6164 GCSshadowstraversed, and 3120replayed. Then I read another section.
The following error was found in the log at the first node of the rac inspection instrument: LMS 8: 7888 GCS shadows traversed, 4001 replayed LMS 2: 7957 GCS shadows
BP networks.)② uses the method of probability theory-maximum likelihood estimation to design the error objective function.The mathematical principle of LMS (minimum mean square) used in linear neural networks can be obtained by the maximum likelihood estimation + hypothesis error probability model. (see Andrew Ng Video)The likelihood function's numerical range is larger than the LMS, especially in two case
(0,1), ( 1,0) Additional weight value is 0, and the C code algorithm is in the frame order of the remote and near-end array xor, the actual application can also be used every 1 frames or 2 frames to do XOR, this can expand the search scope.In general, the complexity of the time-delay estimation algorithm of WEBRTC is greatly simplified, especially for the mobile terminal, which is more sensitive to the computation volume. For practical applications, the algorithm also has a space for improvemen
WEBRTC's echo Cancellation algorithm (AEC,AECM) has several important modules:1. Echo Delay estimation2.NLMS3.NLP4.CNG5. Double-ended detection (DT)The following are respectively described:(1) Echo delay estimationecho Delay Length: Based on correlated time delay estimation algorithm (including: Based on the speech signal autocorrelation pitch period): Echo cancellation site, time delay search range is large.WEBRTC's echo delay estimation, which is based on the algorithm of Gips chief scientist
we predict H (x) based on this formula, the X in the formula is what we know (the eigenvalues in the sample), but the value of θ is not known , so long as we solve the value of theta, we can make predictions based on this formula.Minimum mean method (Least Mean squares)Before introducing the LMS, let's look at what the concept of loss function is.What we're going to do is to select the optimal theta based on our training set and let H (x) as close to
Tags: RAC complete ret file read through file read multi attPCM resource-related wait eventsGC CURRENT/CR block Request: This wait event indicates that the application instance is requesting a current block or CR block, but the resource Master instance's LMS process has not responded to its request.GC CURRENT/CR Block 2 way: This wait event indicates that the application instance has requested a current block or CR block from a remote instance through
always follow this line of thinking: I have 4 shards, so it's a very bad idea to use a 4 possible field to do the chip key.Suppose we have an application that stores user information, and each document has a continent field that represents the user's region, and its field values can be "Africa", "Antarctica", "Asia", "Australia", "Europe", "North Ameraica "or" South America ", considering that we have a data center on every continent-perhaps not Antarctica-and want to provide user data for it f
node.By default, a faulty resource can be run on a node only after the administrator manually resets the resource fault count (after the fault cause is fixed.However, you can set the failure-timeout option of the resource to invalidate the fault count. If you set migration-threshold = 2 and failure-timeout = 60 s, the resource will be migrated to the new node after two failures, and it may be allowed to move back after one minute (depending on stickiness and constraint scores ).There are two ex
This is a creation in
Article, where the information may have evolved or changed.
Go source reading notes (Math.1)
Abs.go
Func Abs (x float64) float64
PackageMath//Abs returns the absolute value of x.////Special cases is://Abs (±inf) = +inf//Abs (Nan) = NanfuncAbs (xfloat64)float64{//Todo:once golang.org/issue/13095 is fixed, change this to: //Return Float64frombits (Float64bits (x) ^ (1 generates better code and can also be inlined: ifX 0{return-X}ifx = =0{return0 //Return correctly
Numbers, cardinality and representations
integerIntegers are these familiar numbers ...,-1, 0, +1, +2, .... Integer values are also referred to as ' complete ' and are divided into positive numbers (1 to infinity), negative numbers (-1 to negative infinity), 0 (0), non-negative (0 or positive), and rare non-positive (0 or negative). The difference between positive and non-negative numbers is usually ve
1.js Digital-nan and Infinity1, in JS, there is a special value, called Nan (not a number), indicating that the operation to return a numeric value is not returned, such as 0 divided by 0 operation, in other languages will be reported errors or exceptions, and in JS, 0/0 will return Nan, do not interrupt code execution.0/0; //NaN2. Any operation involving Nan will return Nan, for example1 + 0/0; //NaN3. Nan is not equal to any value, including itself, for exampleconsole.log(NaN == NaN); //fals
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.