gistfile1.txt

// return C = A * B
    public static double[][] multiply(double[][] A, double[][] B) {
        int mA = A.length;
        int nA = A[0].length;
        int mB = B.length;
        int nB = A[0].length;
        if (nA != mB) throw new RuntimeException("Illegal matrix dimensions.");
        double[][] C = new double[mA][nB];
        for (int i = 0; i < mA; i++)
            for (int j = 0; j < nB; j++)
                for (int k = 0; k < nA; k++)
                    C[i][j] += (A[i][k] * B[k][j]);
        return C;