Question

C#中两个3*3矩阵相乘怎么写?

Answer 1

        static void Main(string[] args)
        {
            string abc = string.Empty;
            for (int i = 1; i <= 3; i++)
            {
                for (int j = 1; j <= 3; j++)
                {
                    abc += string.Format("{0}*{1}={2}  ", i, j, i * j);
                    if (j == 3)
                    {
                        Console.WriteLine(abc);
                        abc = string.Empty;
                    }
                }
            }
        }

测试过，可以。

Answer 2

class Program
{
static void Main(string[] args)
{
//Person p = new Student("张三", "女", "1234", "计算机");
//p.Print();

//C#二维数组
int[,] a = new int[3, 3];
int num = 1;
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
a[i, j] = num;
Console.Write(a[i, j] + " ");
num++;
}
Console.WriteLine();
}
Console.WriteLine();
//C#交错数组 ：数组的数组
int[][] arr = new int[3][];
arr[0] = new int[] { 1, 2, 3 };
arr[1] = new int[] { 4, 5, 6 };
arr[2] = new int[] { 7, 8, 9 };
for (int i = 0; i < arr.Length; i++)
{
for (int j = 0; j < arr[i].Length; j++)
{
Console.Write(arr[i][j] + " ");
}
Console.WriteLine();
}
Console.ReadLine();
}
}

Answer 3

private double[] result(double[][] a,double[][] b)
{
double[] result = new double[3];
for(int i = 0 ; i < 3 ; i++)
{
for(int j = 0 ; j < 3 ; j++)
{
result[i] += a[i][j] * b[j][i];
}
}
return result;
}