I am working through a text and I am supposed to complete the following tasks.
Your ReadFiles.java class requires the following methods:
Method: check to see if the file exists
Method: find number of rows in csv file
Method: Converts the csv file to a mutli-dimensional array
Method: PrintArray
Method: Return array using a get method
Create a file DataAnalyzer.java. This file will be used to call the methods in ReadFiles.java. Be sure to demonstrate that all of your methods work through DataAnalyzer.java.
The problem is that it does not really provide any information on how to go about reading a file into an array. I am stuck at the third task of converting the file to an array and I have tried several ways to do this unsuccessfully. I thought that I would at least try to get things to print out (line 87) to see if I could get that to work, but all that prints in null over and over again.
Java Code:
public class DataAnalyzer {
public static void main (String[] args) {
ReadFiles aReadFiles = new ReadFiles();
aReadFiles.fileCheck();
aReadFiles.findRows();
aReadFiles.convertFile();
We have triangle made of blocks. The topmost row has 1 block, the next row down has 2 blocks, the next row has 3 blocks, and so on. Compute recursively (no loops or multiplication) the total number of blocks in such a triangle with the given number of rows.
I am continuing on in trying to build up the basics of matrix algebra from scratch.
I have created an object class called Matrix
import java.util.ArrayList; public class Matrix { public int NumRows; public int NumColumns;
// This array contains the entries of our matrix. ArrayList<Double> entry = new ArrayList<Double>();
[Code] ......
Bottom line: a matrix has a number of rows and a number of columns, and for each pair of row and column, we have a number in our matrix. The DisplayMatrix method prints my matrix to the screen, and the GetEntry method returns a particular value. This all works fine and dandy as far as I can tell.
A fundamental operation done to matrices to obtain a special matrix called the RREF is the process of switching 2 rows. Here is a method I have written that switches two rows of a matrix, and outputs the result as a new matrix. Note that I want the original matrix to be unchanged.
// Switch two rows public static Matrix SwapRows(Matrix A, int r1, int r2){ if(r1<1 || r1>A.NumRows || r2<1 || r2>A.NumRows) PRINTLN("illegally switching rows"); Matrix C = A; double dummy[] = new double[A.NumColumns];
[Code] ....
How I call this, inside a public static void main(String[] args), is as follows:
// Declares that A is a 2 by 2 matrix. Matrix A = new Matrix(2,2);
// We now add values in. The top left entry of A is 4, the top right entry of A is 1, the bottom left entry of A is 2, and the bottom right entry of A is 6.
double pony[]= new double[4]; pony[0]=4; pony[1]=1; pony[2]=2; pony[3]=6; A.AddEntries(pony);
// We can display the matrix in the output, and it looks exactly as expected!
A.DisplayMatrix();
// I am now going to create a new matrix called B. It is going to be obtained by flipping the first and second rows of A.
//Note that I want A is stay as I initialized it.
//I dont want A to have it's 2 rows switched. I want B to the matrix obtained by switching two rows of A.
Matrix B=SwapRows(A,1,2); B.DisplayMatrix();
// Displaying B gives me the desired result. However, if I now display A again, it is the same as B.
A.DisplayMatrix();
Why is my matrix A being modified? Of course, I am more than capable of providing more details/comments if requested. I suspect that this is a super silly mistake.
I have to organize the rows from the lower to the higher number, the problem is, what I have only organizes the first 3 rows even If I insert 3,4,5...or 10 rows.
for (int i = arg[0].length - 1; i >= 0; i--) { for (int j = 0; j < i ; j++) { for (int k = 0; k < i ; k++) { if (arg[k][j] > arg[k][j + 1]) { int temp = arg[k][j];
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 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];
My requirement is to find the line number using multiline string. Here I need to extract the string between FROM and where clause(from the below string) and need to find the line number in the file
SELECT HL.LOCATION_ID,HPS.PARTY_SITE_ID,HCAS.CUST_ACCT_SITE_ID INTO LN_SITE_LOCATION_ID,LN_LOC_PARTY_SITE_ID,LN_CUST_ACCT_SITE_ID FROM HZ_LOCATIONS HL, HZ_PARTY_SITES HPS,
I have to find the average, highest, and lowest numbers in an array. I already have the average and highest, and I thought I could find the lowest number the same way I found the highest, but it's not working. It just keeps coming out to 0. I've tried out different ways, but I want to see if there are better ways than doing MAX_VALUE for the lowest, then looping it through.
import java.util.Scanner; public class Test_Scores { public static void main(String[] args) { //array,scanner,values
figuring out the logic to print the day number of the year. The directions for my homework are: Write a program that prints the day number of the year, given the date is in the form: month day year. For example, if the input is 1 1 05, the day number is 1; if the input is 12 25 05, the day number is 359. The program should check for a leap year . I have a basic outline of the program but i am having trouble with figuring out the logic to display the day number of the year given the date. This is what i have so far
import javax.swing.JOptionPane; public class Practice4 { public static void main(String[] args){ String monthStr; String dayStr; int inputMonth;
what I needed to know to complete the lesson, but now it just tells me what the output should be and I have to research the information on my own. anyways, here is my code from the previous lesson:
import java.util.Random; import java.util.Scanner; public class tnArray { public static void main(String[] args) { int [] array;
[code]....
Now I have to change it so that instead of counting the number of times a number will appear in the array, I must output which slot in the array the number is in.
I have 2 arrays in random order of 10 numbers.I need to find the biggest number from array A and B and then when its on a screen second thing is to multiply those numbers by 2.
import java.util.Random; public class Projektas { public static void main(String arng[]){ int i,j; int A[] = new int [10]; int B[] = new int [10];;
So basically I am trying to get it that the number inside the square root isnt negative. So lets say I enter a: 1, b: -1, c: 4.25. When you do the discriminant it would be -16 but I want that to be positive so I multiple it by -1 (thats the dem part). Then I sqaure root the whatever the answer is and then go to the imagine and imagineneg part where you find the imaginary number.
My problem is that instead of it being -16*-1 to get 16, some how I get 15.
My program seems to work ok when i enter number in order like 1,2,3 = true , and all the numbers for false seem to be working as well! my problem is when i enter number like 3,2,4 that are not in order but still are consecutive!! I thought that another if statement would be the solution but i have tray several different ones and still can't make it work !!!
Java Code:
import java.util.*; public class Consecutive{ public static void main (String [] args){ Scanner console= new Scanner(System.in); System.out.println("Enter three numbers"); String numbers = console.nextLine();
This is my code up to now and I can't do anything to make it work. I want it to tell me how many times the number 3 appears, and the last position it was in. I am getting errors like"Cuanto.java:88: getPosition(double[],double) in Cuanto cannot be applied to (double) ....
a = getPosition(a);" and unreachable statements, and value not found. It's all over the place every time I make a change to it.
Java Code:
public class Cuanto { static int getPosition(int count,double listOfValues[], double targetValue) { int a = 0, i; for (i=0; i < listOfValues.length; i++) { if (listOfValues[i] == targetValue) { a++;
I wrote this simple piece of code to find the number in the given array of Integers. The program works fine although it shows a couple of errors when i modify it a little bit.
public class DemoLabel{ public static void main(String [] args){ int[][] arrofInts={ {32,45,67,87}, {23,44,55,66}, {12,47,87,56}, {23,44,12,78}
[Code] .....
In the disp() method,Suppose i only want to pass two arguments i.e disp(i,j) given that searchFor variable is visible in the entire class but when i use disp(i,j) i get the following error
DemoLabel.java:38: error: cannot find symbol System.out.println("The number "+searchFor+" is at the location"+i+" , "+j); ^ symbol: variable searchFor location: class DemoLabel
So i decided to declare the
int searchFor as public int searchFor
But the compiler threw another error saying that it was a Illegal start of expression
Also,when i add a SOP line after the label search: it shows the error
code a 10 * 10 matrix, with random numbers from 1 to 100,
i) Find the most repeated number. ii) Use the Binary Sort, to sort the matrix in ascending order. iii) Find the Column, with the highest average number.
Is there any way to find how many number of elements are landing in same bucket in HashSet. I know Reflection could be one way but i am not able to design a program for that.
import java.util.Scanner; public class AvgLrgSml{ public static void main(String[]args){ System.out.print("Hello there. Please enter any three numbers."); Scanner keyboard = new Scanner(System.in); double num1 = keyboard.nextDouble(); double num2 = keyboard.nextDouble();
