athlon x3

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R Language Learning Notes

(x, subset, select, Drop =false, ...) # #对于矩阵 Subset (x, subset, select, Drop =false, ...) # #对于数据框 X is an object, subset is a logical expression that retains elements or rows, and Na is substituted for missing values. Select is the selected range and should be less than X.>x > Rownames (x) =c ("One", "I", "three", "four", "five") >colnames (x) =c ("A", "B", "C", "D", "E", "F") > x >new >new # # Select the A>14 row from a to f column. http://my.oschina.net/zarger/blog/102818 access a column

Algorithm improves 12-1 triangular circumcenter coordinates

The problem is described as a point in two-dimensional space design a structure, on the basis of which a structure for the triangle design. Separate functions are designed to calculate the perimeter, area, center, and centroid of the triangle. Enter three points to output the perimeter, area, Circumcenter, and center of gravity of the triangles that comprise these three points. The result retains 2 digits after the decimal point. The output of the sample output corresponds to the example input a

2015.10.20---Guangzhou

The first two days of practice,The man who has done most of the three-way post----------WTW found out that the first question was said to be the violent miracle of NPU.The fourth question just launched the trajectory is a circle,, Syh found,,, and the polygon is the area of intersection---So the treatment opened another game----Dogs ' CandiesThe E-pang PalaceChoose 8 points from 30 points to make up two rectangles, making their area and maximumEnumerate the bottom left of each rectangle and the

Algorithm (iii) NP

problem, so .... This section describes some of the definitions mentioned above and describes several typical NP-complete problems. Vertex CoverHttp://en.wikipedia.org/wiki/Vertex_Cover Informally, for a graph G (V, E), we select a subset V' in V so that all the edges in E get one point in V. Vertex Cover: vertices in V' cover each edge (because at least one side of each edge is in V') to give you a G (V, E) and a k, ask if there is a Vertex Cover (demo-problem) with k size in the entire G) For

HDU (4357) string change

When the string length is 2: directly simulate (up to 26 times ).When the string length is greater than 2:1. Define the parity of a string as the parity of the sum of all characters of the string.2. because the number of characters in the string is increased by 2 for each changeThe answer must be n o.3. When the parity of a string is the same, the answer must be yes; It can be proved; The following changes can be made to any three characters (x1, x2, X3

One question per day (18) -- Book Purchasing (Dynamic Planning)

increase or decrease the number of books you have bought. The parameters to be processed are the number of purchased volumes, so recursion must be related to these five parameters. You can sort the parameters in ascending order. The number of parameters not 0 is discussed to find all possible discount types. Then, the minimum price is obtained from the current discount type. State transition equation: (X1, x2, X3, X4, X5) indicates the number of purc

Judging convex polygon by cross multiplication of two-dimensional vectors

The problem of judging convex polygon by vector fork multiplication I'm doing a problem, the title is to give the coordinates of several points in a counter-clockwise order, to find out whether the polygon is concave or convex. I saw a formula on the Internet: Three points on the plane: P1 (x1,y1), p2 (x2,y2), P3 (X3,Y3) S (p1,p2,p3) = (x1-x3) * (y2-y3)-(X2-X3

POJ s-trees 1105 (binary tree simulation)

depth n is called terminal nodes. They hAve no children and is marked with either 0 or 1. Note that the variable ordering and the distribution of 0 's and 1 ' s on terminal nodes is sufficient to completely describ E an s-tree.As stated earlier, each s-tree represents a Boolean function f. If you have a s-tree and values for the variables x1,x2,..., xn, then it's quite simple-to-find out what f (x1,x2,..., xn) Is:start with the root. Now repeat the Following:if the node that is at was labelled

POJ topic 1105 s-trees (binary tree Simulation)

depth n is called terminal nodes. They hAve no children and is marked with either 0 or 1. Note that the variable ordering and the distribution of 0 's and 1 ' s on terminal nodes is sufficient to completely describ e an s-tree.As stated earlier, each s-tree represents a Boolean function f. If you have a s-tree and values for the variables x1,x2,..., xn, then it's quite simple-to-find out what f (x1,x2,..., xn) Is:start with the root. Now repeat the Following:if the node that is at was labelled

[Beauty of programming] book purchasing-Dynamic Planning

discuss how to increase or decrease the number of books you have bought. The parameters to be processed are the number of purchased volumes, so recursion must be related to these five parameters. You can sort the parameters in ascending order. The number of parameters not 0 is discussed to find all possible discount types. Then, the minimum price is obtained from the current discount type. (X1, x2, X3, X4, X5) indicates the number of purchased volume

POJ 1329 Circle Through three Points

, minus, and equal signs must be separated from the adjacent characters by a single space on each side. No other spaces is to appear in the equations. Print a single blank line after each equation pair.Sample Input7.0-5.0-1.0 1.0 0.0-6.01.0 7.0 8.0 6.0 7.0-2.0Sample Output(x-3.000) ^2 + (y + 2.000) ^2 = 5.000^2x^2 + y^2-6.000x + 4.000y-12.000 = 0 (x-3.921) ^2 + (y-2.447) ^2 = 5.409^2x^2 + y^2-7.842x-4.895y-7.895 = 0#include #include struct Node{Double x, y;} Center;void Center (double x1,double

Linear programming of MATLAB notes

corresponding to a linear inequality constraint, and lambda.eqlin corresponds to a linear equality constraint. .Example 1>>%solve the following linear programming problems% Max z=2x1+3x2-5x3% S.T. x1+x2+x3=7% 2x1-5x2+x3>=Ten% x1+3x2+x3 A% x1,x2,x3>=0F=[2;3;-5];%target function column matrix A=[-2,5,-1;1,3,1];%Unequal

Interpolation methods, interpolation

values (xi,yi). y1 (x-x2) (x-x3) (x-x4)f(x) = --------------------------- (x1-x2) (x1-x3) (x1-x4) y2 (x-x1) (x-x3) (x-x4) + --------------------------- (x2-x1) (x2-x3) (x2-x4) y3 (x-x1) (x-x2) (x-x4) + --------------------------- (

Known space three points, solving circumscribed Circle Center coordinates, C + + programming implementation

structpt3{Doublex, Y, z;};intSolvecenterpointofcircle (Std::vectorDoublecenterpoint[]) { DoubleA1, B1, C1, D1; DoubleA2, B2, C2, D2; DoubleA3, B3, C3, D3; DoubleX1 = pt[0].x, y1 = pt[0].y, Z1 = pt[0].z; Doublex2 = pt[1].x, y2 = pt[1].y, z2 = pt[1].z; Doublex3 = pt[2].x, y3 = pt[2].y, z3 = pt[2].z; A1= (y1*z2-y2*z1-y1*z3 + y3*z1 + y2*z3-y3*z2); B1=-(x1*z2-x2*z1-x1*z3 + x3*z1 + x2*z3-x3*z2); C1= (X1*y2-x2*

Java Process Control Statements

public class Demo2 {public static void Main (string[] args) {Use of the IF statement: Multi-use for range judgmentsint x=3;int y=10;System.out.println ("= = = Compare Start = = =");if (x>y) {System.out.println ("X>y");}else{System.out.println ("X}System.out.println ("= = = = = = = = = = =");Trinocular operator, maximum valueint max=0;int x1=3;int y1=10;max=x1>y1?x1:y1;System.out.println ("= = = Maximum value is:" +max);If,else If, Judgment statementint x2=3;if (x2==1) {System.out.println ("The v

Three-point order

DescribeNow give you the coordinates of the three point a,b,c, they must be able to form a triangle, now let you judge whether A,b,c is given clockwise or counterclockwise?Such as:Figure 1: Clockwise givenFigure 2: Counter-clockwiseinput  Each row is a set of test data, with 6 integer x1,y1,x2,y2,x3,y3 representing the horizontal ordinate of a,b,c three points, respectively. (coordinate values between 0 and 10000) input 0 0 0 0 0 0 indicates input end

Fourth time assignment

=0.027 u (5) =l (4) + (U (4)-L (4)) *fx (3) =0.024+ (0.03-0.024) *1=0.03When N=6 (A1A1A3A2A3A1):L (6) =l (5) + (U (5)-L (5)) *fx (0) =0.027+ (0.03-0.027) *0=0.027 u (6) =l (5) + (U (5)-L (5)) *fx (1) =0.027+ (0.03-0.027) *0.2= 0.0276Therefore, the real value tag of the sequence A1A1A3A2A3A1 is: Tx (A1A1A3A2A3A1) = (0.027+0.0276)/2=0.02736. For the probability model given in table 4-9, a sequence with a length of 10 labeled 0.63215699 is decoded.Solution:By title: Tx=0.63215699,fx (k≤0) =0, FX (1

Use R to establish Ridge Regression and lasso Regression

1. Ridge Regression and lasso are used to solve the regression problem of Xue Yishu In the 279th pp. 6.10. For example, question 6.10 is as follows: 650) This. width = 650; "src =" http://www.dataguru.cn/kindeditor/attached/image/20140501/20140501171754_87741.jpg "width =" 600 "Height =" 381 "style =" border: none; "/> Enter the data in the example, generate the dataset, and perform simple linear regression to view the results.Cement 29, 56, 31, 52, 55, 71, 31, 54, 47, 40, 66, 68),

[Translation] Bayesian Interpolation

following example shows that the result is very interesting: This method is only exploratory and empirical. It may be wrong from a strict mathematical model. However, the results in actual use are good enough, and this method only requires the minimum amount of computing. The following code is used to draw the image of the lion above. These codes are not optimized and are only used for demonstration. Some variables are calculated twice. In the actual program, if the same variab

Java serial port debugging code is confusing.

// There are three classes in total: commf. Java sendcomm. Java readcomm. Java // The total form. Commf. Java Package youknow; Import java. AWT .*;Import java. AWT. event .*; Import javax. Comm. serialportevent;Import javax. Comm. serialporteventlistener;Import javax. Swing .*;Import javax. Swing. Border. etchedborder;Import java. Io. inputstream;Import java. Io. outputstream;Import java. util. enumeration;Import javax. Comm .*; Public class commf extends jframe implements actionlistener, runnab

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