riris wijaya

if Matrix plus(Matrix B) is a method, then where is data type???

Thanks for the answer. For mr winston, i want to ask if Matrix plus(Matrix B) is not constructor, then what it is called?? and how its work?

public class Matrix { private final int M; private final int N; private final double[][] data; public Matrix(int M, int N) { this.M = M; this.N = N; data = new double[M][N]; } public Matrix(double[][] data) { M = data.length; N = data[0].length; this.data = new double[M][N]; for (int i = 0; i < M; i++) for (int j = 0; j < N; j++) this.data[i][j] = data[i][j]; } private Matrix(Matrix A) { this(A.data); } public Matrix plus(Matrix B) { Matrix A = this; if (B.M != A.M || B.N != A.N) throw new RuntimeException("Illegal matrix dimensions."); Matrix C = new Matrix(M, N); for (int i = 0; i < M; i++) for (int j = 0; j < N; j++) C.data[i][j] = A.data[i][j] + B.data[i][j]; return C; } public static void main(String[] args) { double[][] d = { { 1, 2, 3 }, { 4, 5, 6 }, { 9, 1, 3} }; Matrix B = new Matrix(d); B.show(); System.out.println(); Matrix A = new Matrix(d); A.show(); System.out.println(); A.plus(B).show(); System.out.println(); }
i want to ask about the constructor above. what is the meaning with private Matrix(Matrix A) { this(A.data); } ??? and what is the meaning with Matrix plus(Matrix B)?? is that constructor??? but how is that constructor has return value???

i have found the way to place A and B randomly. Here is my scrip
import java.util.Random; public class OrderMap { public static void main(String args[]){ int Y=10; int X=10; OrderMap baru = new OrderMap(); int y = baru.ran(); int x = baru.ran(); for(int i=0; i<Y; i++){ for(int j=0; j<=X; j++){ if(y==x){ x=x+1; } System.out.print("|"); if(i==y && j==x){ System.out.print("A"); } else if(i==x && j==y){ System.out.print("B"); } else if(y>x){ if(i==x && j==x){ System.out.print("*"); } else{ System.out.print(" "); } } else if(y<x){ if(i==x && j==x){ System.out.print("*"); } else{ System.out.print(" "); } } } System.out.println(""); } System.out.println(y + " " + x); } private int rand; public int ran(){ int nilai[]= new int[10]; Random create = new Random(); rand = create.nextInt(nilai.length); return rand; } }

but still, i can conect A and B with *. Is there any suggestion???

The assignment is to place A and B randomly, and connect it with *. So, whenever the program is run, the position of A and B is change and linked with *.

hy all, i can't figure out the logic of this

| | | | | | | | | | | | | | | | | | | | | | |A|*|*|*|*| | | | | | | | | | |*| | | | | | | | | | |B| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

The position of A and B is random. And A and B is linked by *. What is the logic of this?? do i have to make an array 10 x 10, and access the index randomly to put A??? or what??

hi all, i am new. i tried to make this
> hexboard 1 __ / \ \__/ > hexboard 2 __ __/ \__ / \__/ \ \__/ \__/ \__/ > hexboard 3 __ __/ \__ __/ \__/ \__ / \__/ \__/ \ \__/ \__/ \__/ \__/ \__/ \__/ > hexboard 12 __ __/ \__ __/ \__/ \__ __/ \__/ \__/ \__ __/ \__/ \__/ \__/ \__ __/ \__/ \__/ \__/ \__/ \__ __/ \__/ \__/ \__/ \__/ \__/ \__ __/ \__/ \__/ \__/ \__/ \__/ \__/ \__ __/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__ __/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__ __/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__ __/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__ / \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ \__/ n = 3 (broken into lines as nonoob suggested) 0 __ 1 __/ \__ 2 __/ \__/ \__ 3 / \__/ \__/ \ 4 \__/ \__/ \__/ 5 \__/ \__/ 6 \__/ Let n be the input number and i be the current line (as numbered above). Line 0 is always __ Lines 1 to n - 1 all begin and end like this __/ \__ Line n begins and ends like this / \ Lines 2 to n have i - 1 of these in the middle \__/ Lines n+1 to 2n are made up of 2n - i + 1 of these \__/ The rest is all spacing, the trickiest part.

here is my scrip, i can complete the middle part. this (\_/) part. can anyone help me???
import javax.swing.JOptionPane; public class TestImages { public static void main(String args[]) { int n; n=Integer.valueOf(JOptionPane.showInputDialog("Input Diameter!")); TestImages test = new TestImages(); test.setInput(n); String[][] Temp = test.building(); for (int i=0; i <= test.getZ(); i++) { for (int j=0; j < test.getX(); j++) { if (Temp[i][j] != null) { System.out.print(Temp[i][j]); } else { System.out.print(" "); } } System.out.println(); } for(int i=0; i<n; i++){ for(int j=0; j<i; j++){ System.out.print(" "); } for(int j=n; j>i; j--){ System.out.print("\\_/ "); } System.out.print("\n"); } } private String[][] map; private int input=0; private int X; private int Y; private int Z; private int midX; private int midY; public TestImages() { } public int getInput() { return input; } public void setInput(int input) { this.input = input; this.X = (input*4)-1; this.Y = (input*2)+1; this.Z = input; this.midX = (getX()/2); this.midY = (getY()/2); this.map = new String[getY()][getX()]; } public String[][] building() { write(midX, 0, "_"); write(0, midY, "/"); write(X-1, midY, "\\"); if(input>1){ for(int a=1,b=0,c=1; a<input; a++){ write(midX-(a+c),a,"_"); write(midX-(a+b),a,"/"); write(midX+(a+b),a,"\\"); write(midX+(a+c),a,"_"); b++; c++; } for(int d=2, e=1, f=0, g=2, h=0; d<=input; d++){ write((input*2)-e+f, d, "_"); write((input*2)-g+f, d, "\\"); write((input*2)-h+f, d, "/"); e+=2; f+=4; g+=2; h+=2; } } return map; } private void write(int x, int y, String Value) { map[y][x] = Value; } public int getX() { return X; } public int getY() { return Y; } public int getZ() { return Z; } }