Linear Regression Using Java Code And Weka JAR

File: Regression.java

import weka.core.Instance;
import weka.core.Instances;
import weka.core.converters.ConverterUtils.DataSource;
import weka.classifiers.functions.LinearRegression;

public class Regression{
    public static void main(String args[]) throws Exception{
        //Load Data set
        DataSource source = new DataSource("/home/ashish/Desktop/ws/weka/e4_linear_regression_using_java_code/house.arff");
        Instances dataset = source.getDataSet();
        //set class index to the last attribute
        dataset.setClassIndex(dataset.numAttributes()-1);
        
        //Build model
        LinearRegression model = new LinearRegression();
        model.buildClassifier(dataset);
        //output model
        System.out.println("LR FORMULA : "+model);	
        
        // Now Predicting the cost 
        Instance myHouse = dataset.lastInstance();
        double price = model.classifyInstance(myHouse);
        System.out.println("-------------------------");	
        System.out.println("PRECTING THE PRICE : "+price);	
    }
}

File: house.arff

@RELATION house

@ATTRIBUTE houseSize NUMERIC
@ATTRIBUTE lotSize NUMERIC
@ATTRIBUTE bedrooms NUMERIC
@ATTRIBUTE granite NUMERIC
@ATTRIBUTE bathroom NUMERIC
@ATTRIBUTE sellingPrice NUMERIC

@DATA
3529,9191,6,0,0,205000 
3247,10061,5,1,1,224900 
4032,10150,5,0,1,197900 
2397,14156,4,1,0,189900 
2200,9600,4,0,1,195000 
3536,19994,6,1,1,325000 
2983,9365,5,0,1,230000

File: Execution.log

~/Desktop/ws/weka/e4_linear_regression_using_java_code$ javac -cp ./weka-3.7.0.jar Regression.java
~/Desktop/ws/weka/e4_linear_regression_using_java_code$ 
~/Desktop/ws/weka/e4_linear_regression_using_java_code$ ls -l
total 5232
-rw-rw-r-- 1 ashish ashish     365 Mar  5 09:05 house.arff
drwxrwxr-x 2 ashish ashish    4096 Mar  5 09:12 jar
-rw-rw-r-- 1 ashish ashish    1714 Mar  5 09:24 Regression.class
-rw-rw-r-- 1 ashish ashish     924 Mar  5 09:18 Regression.java
-rw-rw-r-- 1 ashish ashish 5340945 Sep 27  2011 weka-3.7.0.jar
~/Desktop/ws/weka/e4_linear_regression_using_java_code$ java -cp .:./weka-3.7.0.jar Regression
LR FORMULA : 
Linear Regression Model

sellingPrice =

    -26.6882 * houseSize +
      7.0551 * lotSize +
  43166.0767 * bedrooms +
  42292.0901 * bathroom +
 -21661.1208
-------------------------
PRECTING THE PRICE : 222921.57101904938
~/Desktop/ws/weka/e4_linear_regression_using_java_code$ 




(base) ashish@ashish-VirtualBox:~/Desktop/ws/weka/e4_linear_regression_using_java_code$ ls -l
total 13852
-rw-rw-r-- 1 ashish ashish      923 Mar  5 09:25 execution.log
-rw-rw-r-- 1 ashish ashish      365 Mar  5 09:05 house.arff
drwxrwxr-x 2 ashish ashish     4096 Mar  6 15:04 jar
-rw-rw-r-- 1 ashish ashish     1714 Mar  5 09:24 Regression.class
-rw-rw-r-- 1 ashish ashish      924 Mar  5 09:18 Regression.java
-rwxrwxrwx 1 ashish ashish 14163929 Jan 25 16:06 weka-3.8.6.jar
(base) ashish@ashish-VirtualBox:~/Desktop/ws/weka/e4_linear_regression_using_java_code$ java -cp .:./weka-3.8.6.jar Regression
Exception in thread "main" java.lang.NoClassDefFoundError: no/uib/cipr/matrix/Matrix
	at Regression.main(Regression.java:15)
Caused by: java.lang.ClassNotFoundException: no.uib.cipr.matrix.Matrix
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 1 more
(base) ashish@ashish-VirtualBox:~/Desktop/ws/weka/e4_linear_regression_using_java_code$ javac -cp .:./weka-3.8.6.jar Regression.java
(base) ashish@ashish-VirtualBox:~/Desktop/ws/weka/e4_linear_regression_using_java_code$ java -cp .:./weka-3.8.6.jar Regression
Exception in thread "main" java.lang.NoClassDefFoundError: no/uib/cipr/matrix/Matrix
	at Regression.main(Regression.java:15)
Caused by: java.lang.ClassNotFoundException: no.uib.cipr.matrix.Matrix
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 1 more

- - - 

TRYING AGAIN WITH WEKA-3.7.0.JAR:

(base) ashish@ashish-VirtualBox:~/Desktop/ws/weka/e4_linear_regression_using_java_code$ java -cp .:./weka-3.7.0.jar Regression
LR FORMULA : 
Linear Regression Model

sellingPrice =

    -26.6882 * houseSize +
      7.0551 * lotSize +
  43166.0767 * bedrooms +
  42292.0901 * bathroom +
 -21661.1208
-------------------------
PRECTING THE PRICE : 222921.57101904938

Tags: Technology,Machine Learning,Regression