All Permutations Of 2 Coordinate Int Array?

Apr 12, 2014

I have a set of 2D arrays, structured as so: int[][] cage = new int[someLength][4]. Each array has a set column length of 4; the first two columns are all that concern us with this problem. They are used to define the row and height respectively of a point (e.g. 2,4).

What I need is to generate all possible permutations of the points using both row and column coordinates from the 2D array. I found a working method to generate all permutations for 1D array of ints here: My link, under update 2 of the first answer.

Here is an example of a possible input and corresponding output desired:

In: (1,0)
(1,1)
Out:(1,0),(1,1)
(1,1),(1,0)

the result will be stored in a 2D array of ints.

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All Permutations Of 2 Coordinate Int Array

Apr 12, 2014

I have a set of 2D arrays, structured as so: int[][] cage = new int[someLength][4]. Each array has a set column length of 4; the first two columns are all that concern us with this problem. They are used to define the row and height respectively of a point (e.g. 2,4).

What I need is to generate all possible permutations of the points using both row and column coordinates from the 2D array. I found a working method to generate all permutations for 1D array of ints here: [URL] ..... , under update 2 of the first answer.

Here is an example of a possible input and corresponding output desired:

In: (1,0)
(1,1)
 
Out:(1,0),(1,1)
(1,1),(1,0)

Ideally the result will be stored in a 2D array of ints.

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Permutations In Java

Oct 2, 2014

I have 5 numbers between 0 to 13 in ascending order stored in an array. They may have repeats. I want to perform permutations and figure out the number of running pairs (minimum 3 numbers in a pair. Ex- 012, 345, 456, 1234, 78910) that I can make with these command line inputs that I get.

Lets say my user input was 01123. For this sequence I'll have the following pairs-

012
012
1234
1234
123
123
0123
0123

There are same repeated sequences because there are two 1's hence same pairs using different 1's.I have the input in an array so I'm wondering if there is any inbuilt class for arrays that would let me do this. If not, whether I can pass it into a collection and then find its permutations. Following which I traverse through the sequences and update a count for each running pair generated to pass onto an array in another variable to perform some other functionality. If this is viable how to implement this in code ? I'm new to java and am not familiar with the classes available.

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How Code Is Getting All Permutations Of A String With Recursion

Aug 7, 2014

how the code is getting all the permutations of a string with recursion. The following code works correctly but I am having trouble grasping what it is doing.

public class Main {
private static void permutation(String prefix, String str){
int n = str.length();
if (n == 0)
System.out.println(prefix);
else {
for (int i = 0; i < n; i++)
permutation(prefix + str.charAt(i),
str.substring(0, i) + str.substring(i+1));
}
}
public static void main(String[] args) {
permutation("", "ABCD");
}
}

I see that each character is being appended to prefix through each iteration. So I know it adds "A" then "B" etc etc. I can follow it up until the "D" is appended to the prefix string. After that I don't understand how the D moves back to the str string and then the C moves back to str followed by the D moving back to the prefix string. I have stepped through the code many times in my debugger but still don't see how it moves back to str and knows to send D to prefix and not to send C. I feel I don't understand how recursion behaves therefore I can't follow.

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Apr 16, 2014

how I can use this class:

Java Code:

public class Coordinate{
public int x;
public int y;
publ Coordinate(int x, int y){
this.x = x;
this.y = y;

[code]....

How would I use Coordinate in the second code?

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Oct 18, 2014

I've been pondering about this algorithm for about a week but I'm still not able to write a "fast" working method/algorithm to solve the Number-of-paths-exercise we were given in my class />

So here's the task:
Write an efficient java program "Paths" which solves the following task:

- Read input n ∈ N and give output a(n) which is the number of paths from (0,0) to (n,0)
it is not allowed to go over the diagonal (m,m) and also not below the x-axis (m,0)

Here are the allowed steps:
u = (1,1), U = (1,4), d = (1,−1), D = (1,−4) and H = (1,0)
steps are performed in a two-dimensional-coordinate-system!

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Mar 6, 2014

Ok Im trying to create a code right now that will take a table of rectangular coordinates and convert them to Polar coordinates in the constructor. I will eventually calculate the total distance between all points in the calculateDistancePolar method but for now I am using it to test.

It doesnt like line 29 and 31 of the class Polar and I cannot figure out why.

public class Test {
public static void main(String[] args) {
double[][] coords = {{86.92, 2.47},{70.93, 27.81},{97.74, 34.36},{30.90, 35.14},{51.66, 31.70},{0.830, 21.77},{55.91, 66.62},{32.92, 75.23},{65.26, 72.53},{83.90, 4.710}};
System.out.println("X,Y Coordinates are:");
outputArray(coords);
Polar myTest = new Polar(coords);

[Code] .....

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Feb 3, 2015

import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
/**
An applet that shows a rotating globe.

[Code] ....

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May 24, 2014

I'm having a random x and y coordinate generate and I need to check if the coordinates are inside of a right triangle on this imaginary coordinate plane.

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Nov 8, 2014

So I need to generate 10 random integers in the range 1-20 but i have to store them in an array called numbers. Then I have to call a method called displayArray which displays the contents of the array and for the assignment i have to use a for loop to traverse the array. The method header for the displayArray method is:

public static void displayArray(int[] array)

This is what I have done
 
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[Code] .....

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Mar 24, 2015

I am taking the Class Algorithms and Datastructures and got an assignment for Lab that really throws me off. The goal is to create an Array out of a given CSV file, implement several Methods that get the size of array, etc.

I am still stuck in the first part where the CSV has to be imported into the Array. My problem is that I need a mechanism that figures out the needed size for the Array, creates the array, and only then transfers the data from the CSV.

The list consists of the following wifi related values:

MAC-Adress, SSID, Timestamp, Signalstrength.

These are on the list, separated by comma. The Columns are each of these, and the rows are the four types of values making up the information on a certain wifi network.

The catch is, we are not allowed to use any of the following:

java.util.ArrayList
java.util.Arrays
and any class out of java.util.Collection.

So far I used the BufferedReader to read in the file and tried to implement the array, but I get an arrayindexoutofboundsexception.

Below is my Code (Its still an active construction zone):

public class WhatsThere {
public WhatsThere(String wifiscan) throws IOException {
}
public static void main(String[] args) throws IOException {
// WhatsThere Liste = new WhatsThere(String wifiscan);
String[][] arrayListe = new String[0][0];

[Code] ....

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Feb 13, 2014

i am working on the same project and i got the code to make them print going down but not sideways.

public class ArrayofHope
{
public static void main(String args[])
{
System.out.println("Decimal Character
");
for(int j = 65; j <= 90; j++)
{
System.out.print(j);
System.out.println(" " + (char)j); //Character
}
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Aug 3, 2014

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Anyway, i am working on simply making the spiral, which should look like the one below.

n = 3

7 8 9
6 1 2
5 4 3

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import java.io.*;
public class Spiral
{
public static void main(String args[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the number of elements : ");
int n=Integer.parseInt(br.readLine());

[Code] .....

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Nov 15, 2014

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A B C D E
F G H I J
K L M N O
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Jun 21, 2014

I have the following code in which I am looping through the rows of one array (composed of Strings) and copying it to another array. I am using .clone() to achieve this and it seems work as it changes the memory location of the rows themselves. I did notice that the String objects are still pointing to the same location in memory in both arrays but I won't worry about that for now, at the moment I just want to understand why the array I am cloning is not successfully assigning to the other array.

This is the incorrect line: ar[r] = maze[r].clone();

My code:

private String[][] maze = {{"*","*","*"," ","*","*","*","*","*","*"},
{"*"," ", "*"," "," "," ","*"," ","*","*"},
{"*"," ","*","*","*"," ","*"," ","*","*"},
{"*"," "," "," "," "," "," "," "," ","*"},
{"*","*","*","*","*"," ","*","*","*","*"},
{"*","*","*","*","*"," ","*","*","*","*"}};
//private String[][] mazeCopy = copyMaze(new String[6][10]);
private <T> T[][] copyMaze(T[][] ar){
for (int r = 0; r < ar.length; r++){
ar[r] = maze[r].clone();
}
return ar;
}

My compiler says: Required: T[]. Found: java.lang.String[]

Since ar[r] is an array and .clone() also returns an array why is this line incorrect.

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Jun 15, 2014

Write a method that returns a new array by eliminating the duplicate values in the array using the following method header: public static int[] eliminateDuplicates(int[] list). The thing is that I found the working solution that is written below, but how it works. How to eliminateDuplicates method done with flag and flag2.

Here is the code:

Java Code:

import java.util.Scanner;
public class Exercise06_15 {
public static void main(String[] args) {
java.util.Scanner input = new java.util.Scanner(System.in);
int[] numbers = new int[10];
System.out.println("Enter ten numbers: ");

[code]....

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Oct 13, 2014

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I included only the relevant functions of the code:

public boolean goNorth(char[][] array) {
boolean success = true;;
x = getX();
//x = this.x;
y = getY();
//y = this.y;
if ((x - 1 >= 0 && x - 1 < array.length)
&& (y >= 0 && y < array[x].length)) {

[Code] .....

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Feb 7, 2015

I am passing input from the user to a method that will initialize an array of the data (scores in this case). The method is filling the entire array with the last input value.

array initializer method

Java Code:

public static float[] inputAllScores(float validScore) {
float[] diverScores = new float[7];
for (int i = 0; i < diverScores.length; i++) {
diverScores[i] = validScore;
}
return diverScores;
} mh_sh_highlight_all('java');

[Code] .....

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Oct 10, 2014

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In addition; I have all the operations written that I need except for one final one. And that is clear(). clear() is meant to empty the array, essentially it is a popAll() method. Then all I need to do is set up so I can print out the arrays and I should be able to handle everything else.

StackInterface:

/**
An interface for the ADT stack.
*/
public interface StackInterface<T>
{
/** Adds a new entry to the top of this stack.
@param newEntry an object to be added to the stack */
public void push(T newEntry);

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*/
public T pop();

[Code] ....

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Feb 16, 2015

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byte[] noteValues = new byte[]

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I've tried amending the manual input to fit in with the Random array, as follows:

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In this case, however, the Byte array can't interpret the int values. Also, if the Byte array is outside the 'for' loop, array[randomIndex] cannot be resolved.

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Apr 19, 2015

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public class Forest
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private int h;
private int w;
private double p = 0.7;
private int[][] f;
Forest(int w, int h)

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May 17, 2014

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May 13, 2014

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Feb 13, 2014

I have double checked this code over and over and I just can't find the problem.

What I'm trying to do is take a file and input it into an 2D array.

Ultimately, I should convert the array of integers to an array of characters, then print it out. The file contains a set of ASCII values.

After printing it out, I should then create methods to manipulate the image produced.

Using 2D arrays is a requirement for this exercise.

I think that somehow I'm overcomplicating this and the solution is a lot more simple than I think, but I can't think of what to change.

The error I am getting is:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 40
at main.main(main.java:17)

Java Code:

import java.util.*;
import java.io.*;
public class main {
public static void main(String[] args)
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Apr 12, 2015

I have an array of Strings, one on each line and I need to convert them into an array of char's.

For Example:

This
is
an
Example
of
what
my
input
is.

In order to accomplish that I did the following-

String[] lotsOfText = a.gettingAnArrayAsAReturn();
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for(int i=0; i<lotsOfText.length; i++){
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myCharArray[i][j] = lotsOfText[j].charAt(j); }}

But whenever I try this and then try to print the output :

for (int i = 0; i < lotsOfText.length; i++) {
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}
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I get nothing. I'm not sure what's the flaw in my logic, is it the char array initialization that's wrong or is it something else ?

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