Here you can find the source of sum(int M[][])
public static int[] sum(int M[][])
//package com.java2s; /*//from w w w . j av a2s . c o m * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { /** * Sum - sum this matrix. */ public static int[] sum(int M[][]) { int s[] = new int[M.length]; for (int j = 0; j < M.length; j++) { for (int k = 0; k < M[j].length; k++) { s[j] += M[j][k]; } } return s; } /** * Sum - sum this matrix. */ public static double[] sum(double M[][]) { double s[] = new double[M.length]; for (int j = 0; j < M.length; j++) { for (int k = 0; k < M[j].length; k++) { s[j] += M[j][k]; } } return s; } }