SDPTA

import java.util.*;

class SDPTA {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter number of the input vector");
        float n = sc.nextFloat();

        ArrayList<ArrayList<Double>> x = new ArrayList<ArrayList<Double>>();
        ArrayList<ArrayList<Double>> desired = new ArrayList<ArrayList<Double>>();

        for (int i = 0; i < n; i++) {

            System.out.println("Enter the input vector");
            ArrayList<Double> temp1 = new ArrayList<Double>();
            temp1.add(sc.nextDouble());
            temp1.add(sc.nextDouble());
            x.add(temp1);

            System.out.println("Enter the desired vector");
            ArrayList<Double> temp = new ArrayList<Double>();
            temp.add(sc.nextDouble());

            desired.add(temp);

        }

        ArrayList<Double> weight = new ArrayList<Double>();

        for (int i = 0; i < 2; i++) {
            weight.add(1.0);
        }

        System.out.println(weight + "Weight");

        double output = 0;

        int p = 0;
        int k = 0;
        double E = 0;
        int flag = 0;
        do {
            output = mul(weight, x.get(p));

            if (output >= 0) {
                output = 1;
            } else {
                output = 0;
            }
//System.out.println(output);

            double r = desired.get(p).get(0) - output;

            System.out.println(r + "is r");

            for (int i = 0; i < weight.size(); i++) {
                weight.set(i, weight.get(i) + 0.5 * 0.1 * r * x.get(p).get(i));
            }

            if (flag == 0) {
                E += 0.5 * r * r;
            } else {
                E = 0.5 * r * r;
                flag = 0;
            }

            p++;
            k++;

            if (p == n) {
                if (E == 0) {
                    System.out.println("The input is " + x);
                    System.out.println("The desired is " + desired);
                    System.out.println("The weight is " + weight);
                    System.out.println("k value is " + k);
                } else {
                    E = 1000;
                    flag = 1;
                    p = 0;
                    System.out.println("The weight is " + weight);
                }
            }

        } while (E != 0);

        System.out.println("The input is " + x);
        System.out.println("The desired is " + desired);
        System.out.println("The weight is " + weight);
        System.out.println("k value is " + k);

    }

    public static double mul(ArrayList<Double> weight, ArrayList<Double> x) {
        int ans = 0;
        for (int i = 0; i < weight.size(); i++) {
            ans += weight.get(i) * x.get(i);
        }
        return ans;
    }

}

/*Output:
 The input is [[1.0, 1.0], [6.0, 3.0]]
 The desired is [[0.0], [1.0]]
 The weight is [0.5000000000000002, -1.0000000000000009]
 k value is 141
 */