Java Matrix Multiply multiply(double[][] m, double[] x)

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Description

Multiply a square matrix and a vector.

License

Open Source License

Declaration 

public static double[] multiply(double[][] m, double[] x)

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    /**//from  www  .  j  a v  a  2 s.co m
     *  Multiply a square matrix and a vector. 
    Note that matrix width and vector length have to be equal, otherwise null is returned.
     */
    public static double[] multiply(double[][] m, double[] x) {
        assert (m[0].length == x.length);
        double[] y = new double[m.length];
        for (int i = 0; i < m.length; i++)
            for (int j = 0; j < x.length; j++) {
                y[i] += m[i][j] * x[j];
            }

        return y;
    }
}

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