MATLAB中求矩阵非零元的坐标: 方法1: index=find(a); [i,j]=ind2sub(size(a),index); disp([i,j]) 方法2: [i,j]=find(a>0|a<0) %列出所有非零元的坐标 [i,j]=find(a==k) %找出等于k值的矩阵元素的坐标 所用函数简介: IND2SUB Multiple subscripts from linear index. IND2SUB is used to determine the equivalent
29 [程序 29 求矩阵对角线之和] 题目:求一个 3*3 矩阵对角线元素之和 程序分析:利用双重 for 循环控制输入二维数组,再将 a[i][i]累加后输出. package cskaoyan; public class cskaoyan29 { @org.junit.Test public void diagonal() { java.util.Scanner in = new java.util.Scanner(System.in); int[][] arr = new int[3][
求集合里元素的个数 输出最大的个数是多少 Sample Input41 23 45 61 641 23 45 67 8 Sample Output42 # include <iostream> # include <cstdio> # include <cstring> # include <algorithm> # include <cmath> # include <queue> # define LL long long usi