# Determining Linear Approximations

• March 12th, 2011, 05:23 PM
ddunlop07
Determining Linear Approximations
I'm trying to code a program that will read a set of data poitns ( x & y) from a text file and then perform a Linear Least Squares Analysis to determine the a0 and a1 of the linear regression line, as well as the Square Error value.

this is what I have so far without any of the equations but some of it doesnt seem to make sense. Can anyone let me know how it looks so far?

Code Java:

```import java.io.*; import java.util.Scanner;   public class FileScannerTest { // Since the could be an error in obtain a path to the input file, // the "throws FileNotFoundException" clause must be added. public static void main(String[ ] args) throws FileNotFoundException {   Scanner scan = new Scanner (System.in);   System.out.println ("Enter x value (0 to terminate): "); int input = scan.nextInt(); // Variable for user input.   //method to check if numeric or not. if ("-2324.00".matches("((-|\\+)?[0-9]+(\\.[0-9]+)?)+")) {   }else { System.out.println("Value is NOT numeric!");   // arrays to hold the values for x and y String[] x = new String[25]; double sum = Double.parseDouble(x[1]); for (int i = 0; i < x.length; i++) { sum += x[i];   String[] y = new String[25];   // Declare an Employee "counter" and initialize it to zero. int count = 0;   // Declares the file path to Assignment5_data String currentDir = System.getProperty("user.dir"); String fileName = currentDir + "\\Assignment5_data.txt";   // Set up the input file, the scanner file stream, and the data string delimiter. // In this case, the delimiter is set at one space, which is what separates the two data points File inFile = new File(fileName); Scanner fileScanner = new Scanner(inFile); String delimiter = " ";   // Declare a variable to hold each line of file input. String line;   //Use fileScanner to read each line. while ( fileScanner.hasNextLine() ) { // Read each line of text and split it up based upon the delimiter. // The x string is placed in temp[0], // the y string in temp[1], line = fileScanner.nextLine(); String [] temp = line.split(delimiter); // and increment the value of count. x [count] = temp[0]; y [count] = temp[1]; count++; }     // Close the file stream. fileScanner.close();   /* for (int index = 0; index < count; index++) { System.out.println(x[index] ); System.out.println(y[index] ); System.out.println(""); sum += Integer.parseInt(y [index]); } */ } } } }```
• March 12th, 2011, 11:12 PM
yourClassmate
Re: Determining Linear Approximations
You probably could have gotten an answer in the Programming Assignment 5 Questions Forum on moodle. ;D