Release 1 Dimensional Array From 2 Dimensional Array
Mar 13, 2014
I have a 2x2 matrix and a 2 dimensional array.Let's say, my matrix is [a b] and array is [[1, 2], [3, 4], [5, 6],[23, 11]] .I need to multiply each 1 dimensional array in above array with the matrix.For instance,
[1, 2] multiply with [a b]
[3, 4] multiply with [a b]
[5, 6] multiply with [a b]
[23, 11] multiply with [a b]
So, each 1 dimensional array in there will be multiplied with matrix [a b] (same with matrix multiplication).how to do that multiplication in java. But I confuse how to 'release' each 1 dimensional array from the first array so I can do multiplication.How to do that in java?
How to declare a 2 dimensional array of interger of size 10 by 10. and then set every element of the array to 3. After this I need to add up all the element in this array and return the value.
final int ROWS = 10; final int COLS = 10; int[][] foo = new int[ROWS][COLS]; for (int i = 0; i < ROWS; i++){ for(int j = 0; i< COLS; i++){ foo[i][j] = 3; } }
This is what i have done so far(not 100% if is correct..) but how to add up all the array.
I am working on the following java assignment..Write a program that randomly fills in 0s and 1s into a 4- by- 4 matrix, prints the matrix, and finds the first row and column with the most 1s. Here is a sample run of the program:
0011 0011 1101 1010
The largest row index: 2 The largest column index: 2
I have code that generates random 0s and 1s for the array, how to get the largest column and row.
import java.util.Random; public class LargestRowColumn { public static void main(String[] args){ //create 4x4 array matrix int arrayMatrix[][] = new int[4][4];
[code]....
finding the row and column with the largest amount of 1s. I keep thinking well if I scan and find a one in the array, maybe I can just save the index of the row and column and then determine which index contains the most 1's after the array has been scanned.
I am workinh with a couple of functions that deal with two dimensional (square) arrays of integers, doing things like checking equality, etc. For example, I know that I get an ArrayOutOfBoundsException in the isEqual function, but I don't know why.
public class MatrixUtils { //This function checks if two matrices are equal public static boolean isEqual(int A[][], int B[][]) { for(int i=0; i<A.length; i++) { for(int j=0; j<A.length; i++) { if (A[i][j] != B[i][j]) return false;
I have to make a program in which users inputs a number and the program should search into a two dimensional array and print out all the values that are below the number This is my first time experimenting with 2D Arrays and how to do this program I have the array set up
I am having trouble fixing and figuring out how to change my code. My out put is very off.
" Enter a 3-by-3 matrix row by row: 1 1 1 1 1 1 1 1 1 Sum of the major diagonal is 6.0 Sum of the values of the column are: 10.0 Sum of the values of the column are: 20.0 Sum of the values of the column are: 30.0 "
Code is below:
public static void main(String[] args) { double[][] m = new double[3][3]; m = createArray(); } private static double[][] createArray() {
I want to compere two element of string array by each other! eventually I want to print Yes or No in matrix . SO, I start reading data from file then split them into two parts .
File file= new File(fileName); try { inputStream = new Scanner(file); while (inputStream.hasNext()){ String data= inputStream.next(); String [] token =data.split(","); System.out.println("day"+token[0] +"embloyee name:"+ token[1]) ; } inputStream.close();
Now I want to compere each cell from token[0] by another array :
if the days are equal then I want print yes in front of the employee name if not then i want to print No..is this gone work with me as I imagine it to be or do I have to take few more steps to get my code going?
I want to declare a 2 dimensional array in java which has 3 column and unlimited number of rows, i want to give a special name to each column . The type of first column is string second one is int and the last one is string
Column1_name Column2_name Column3_name String value Int value String value . . . . . .
I reserved one row for first class and another for economy class. This code works just as I want but my question is how can I loop through it so I don't need all the if statements? I tried it many ways. I tried something like this but I cant get it to work.
for (int row=0;row<seat.length;row++{ for (int col=0;col<seat[row].length;col++){ if (seat[0][col]==false){ seat[0][col]=true; System.out.println("You have number 0" + row + in first class);
I need to design a class named Location for locating a maximal value and its location in a two-dimensional array. The class should contain public data fields row, column, and maxValue that store the maximal value and its indices in a two dimensional array with row and column as int type and maxValue as double type.
I need to write the following method that returns the location of the largest element in a two-dimensional array: public static location locateLargest(double[][] a)
The return value is an instance of Location. Write a test program that prompts the user to enter a two-dimensional array and displays the location of the largest element in the array.
Here is what i get when I run
Enter the number of rows and columns of the array: 3 4 Enter the array: 23.5 35 2 10 4.5 3 45 3.5 35 44 5.5 9.6 The location of the largest element is at 00 The location of the largest element is at 01
But I need it to display this instead.
Enter the number of rows and columns of the array: 3 4 Enter the array: 23.5 35 2 10 4.5 3 45 3.5 35 44 5.5 9.6 The location of the largest element is 45 at (1,2)
public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("Number of rows and columns: "); int row = input.nextInt(); int col = input.nextInt();
[Code] ....
Enter the number of rows and columns of the array: 3 4 Enter the array: 23.5 35 2 10 4.5 3 45 3.5 35 44 5.5 9.6 The location of the largest element is at 00 The location of the largest element is at 01
I need it to display this instead.
Enter the number of rows and columns of the array: 3 4 Enter the array: 23.5 35 2 10 4.5 3 45 3.5 35 44 5.5 9.6 The location of the largest element is 45 at (1,2)
I have a 2 dimensional array assignment with a loop, i'm supposed find the average score of each student from a grade record and find the average score for each test. I've been trying to do the assignment all day with no progress. This is what i have so far
public class SiuTest { public static void main(String[] args) { String [] stu= new String [5]; int [] [] grade= new int [4][2]; String hold;
What the program must do is to parse the string-declared two-dimensional array for the program to compute the student's scores in their quizzes, but I'm having difficulty in anything with Parsing so I don't know what will be the appropriate codes.
Error: incompatible types: String[][] cannot be converted to int[][]
import java.io.*; public class Quiz3{ public static void main(String[]args)throws IOException{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String [][]StudQuiz = new String [5][4];
[Code] ....
How am I able to compute the average of the score if the data that is needed to be computed is in the string-declared array?
I am pretty new to Java and am just learning about two dimensional arrays. I think that I understand the concept, but I seem to be having trouble adding stuff to my array. I wanted to make an array to hold both strings and integers, but wasn't sure if I could put integers in a string array. So I thought that I would be able to convert my integers to string and then add them. This however causes an error. This is my code(yes its probably not the best):
static String [][] students = new String [14][4]; static int number = 0; String fName, lName, fullName; int test1, test2, test3, test4; String a, b, c, d;
Long story short: The program takes user values (temperature) and converts them to the opposite (C >> F / F >> C)
I originally started this program with three separate arrays but then decided that it would be a good opportunity to use a two-dimensional array and one other.
The two-dimensional array has 2 rows, 10 columns. The second is a normal String array ...
Java Code:
String[][] myTemperatures = new String[2][9]; String inputAssembly[] = new String[9]; mh_sh_highlight_all('java');
I prompt the user for to enter temperature values, using a GUI and jbutton to distinguish F/C. Each time the user clicks 'continue', the values are stored into the two-dimensional array. One row holds the temperature, the other holds the C or F designation.
Java Code:
// CONTINUE BUTTON CLICK ACTIONS class ContinueButtonListener implements ActionListener{ @Override public void actionPerformed(ActionEvent arg0) { // TODO Auto-generated method stub input = view.getTempValue();
[Code] ....
This is where I am experiencing the trouble and I cannot seem to get the Debug to work properly here. When the two-dimensional array is full OR the user clicks 'calculate' instead of 'continue', the Calculate event is performed via an ActionListener.
Java Code:
// CALCULATE BUTTON CLICK ACTIONS class CalculateButtonListener implements ActionListener{ @Override public void actionPerformed(ActionEvent arg0) { // TODO Auto-generated method stub String hold; Double temp;
And I get a ton of errrors ...
Java Code:
Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "[Ljava.lang.String;@7441b1fd" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.parseInt(Unknown Source)
[Code] ....
I imagine the issue lies within how I am handling the two-dimensional array in the CALCULATE event and/or converting the String[][] to String then parsing to an Integer.
Would this be better done is separate arrays (not using one two-dimensional, but storing 34C, 45F ... in one. I think this would be difficult for me to parse for conversions).
// Demonstrate a two-dimensional array class TwoDArray { public static void main(String args[]) { int twoD[] [] = new int[4] [5]; int i, j, k = 0;
[Code] .....
Output:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
(1) I don't understand how repeating the loop creates the structure of the output. Taking the second loop away and putting the "System.out.print(twoD[i] [j] + " " );" under k++ creates the output to print a number on each line. How do I write the code not having the second loop, assigning k to each value that is moved through the grid then printing it out but having the output the same?
Suppose I have private static void name() { ... } that has a two dimensional string array named array[. Now suppose I have private static void different() {...} and I want to write a condition where if (item == array) { ... }, how can I access my array from name() when I am in different()? I get a compile error saying cannot find symbol. My code is similar to:
I have a question about an error I am getting when trying to pass a two dimensional array to a method. I keep getting the "incompatible types, int cannot be converted to int[][]". I am getting the error in a few different place (see comments - at the first call of the method, at a recursive call, and at the return statement. I believe I am passing the same type of array in all cases to the type of array defined in the method parameters.
Below is my code.
// this is a call from the main method int[][] c = new int[temp1.length][temp1.length]; c = MatrixMultiply(a,b); // this is first place the error occurs } // end main public static int MatrixMultiply(int[][] A, int[][] B) { // throw new UnsupportedOperationException("Not supported yet."); int a[][] = A;
I have several private jars which are linked to my project and I need them to write and read values tofrom the same b-dimensional array. Actually I need a single array which in which my app and its linked jars will write to and read from it. How can I achieve that?
I have this 2 dimensional array that represents color pixels
RGBColor[][] rgbArray1 = new RGBColor[rows][columns] - so each elemnt in this array is a pixel - (red, green, blue)
I wrote a class named RGBImage. represents an image. the constructor of this class takes RGBColor[][] rgbArray1 as an argument and print the image.
My problem is when i try to rotate the image 90 degrees. because the dimentions are changeing. i'm getting ArrayIndexOutOfBounce Exception.
I know i can to this by create a bigger 2 dimensional array and copy the original , but for this assignment i cant do this .
I must use the original one . now i will show the main method that will get things clearer if i didnt explained well enough.
System.out.println("Constructor with RGBColor[][] Array Parameter:"); RGBColor[][] rgbArray1 = new RGBColor[3][4]; for (int i=0; i<rgbArray1.length;i++) for (int j=0; j<rgbArray1[0].length;j++) rgbArray1[i][j] = new RGBColor(i,i,i);
So I am trying to open a file and store the contents into a two dimensional array. I seem to have no problem using this same basic code to read the file and output it. But when I try to change it so that all the data is stored into the array, it does not work.
Java Code:
public void convertFile() { String filePath = ("C:UsersBradDownloadsFB1.csv"); String [][] rowCol = new String [429][6]; try { BufferedReader br = new BufferedReader(new FileReader(filePath)); StringTokenizer st = null; System.out.println("Your file is being converted to an array. This may take several minutes.");
I wrote this code which print a black image depends on the number of rows and columns you give it
public class BlackImg { private Mycolor[][] colorArr; //Mycolor is a class i wrote that represents colors. // no need for showing the class here. // so i created here an array of type Mycolor, for example: // { {(255,255,255), {(127,127,0)} }
[Code] .....
my problem is that my output comes good except the last line ,
Output: (0,0,0) (0,0,0) (0,0,0) (0,0,0) (0,0,0) (0,0,0) (0,0,0) (0,0,0) (0,0,0) (0,0,0) (0,0,0) (0,0,0) BlackImg@1db9742 //what is this line , why does it showing up ?
I'm working on a project and I can't seem to get it working. It is a battleship game, in a one dimensional array. This is as much as I got. I can't get the 'river' to display when I run the program. How I might get it to work?
import java.util.*; import java.util.Random; public class Battleship { static Scanner input = new Scanner(System.in); public static int promptForInt(String prompt)
