📜  C++程序检查幂等矩阵

📅  最后修改于: 2022-05-13 01:55:45.172000             🧑  作者: Mango

C++程序检查幂等矩阵

给定一个 N * N 矩阵,任务是检查矩阵是否是幂等矩阵。
幂等矩阵: 如果矩阵乘以自身返回相同的矩阵,则称矩阵是幂等矩阵。当且仅当M * M = M时,矩阵 M 被称为幂等矩阵。在幂等矩阵中,M 是一个方阵。

幂等矩阵

例子:

Input : mat[][] = {{3, -6},
                   {1, -2}};
Output : Idempotent Matrix

Input : mat[N][N] = {{2, -2, -4},
                     {-1, 3, 4},
                     {1, -2, -3}}
Output : Idempotent Matrix.

C++
// Program to check given matrix 
// is idempotent matrix or not.
#include
#define N 3
using namespace std;
  
// Function for matrix multiplication.
void multiply(int mat[][N], int res[][N])
{
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < N; j++)
        {
            res[i][j] = 0;
            for (int k = 0; k < N; k++)
                res[i][j] += mat[i][k] * mat[k][j];
        }
    }
}
  
// Function to check idempotent
// property of matrix.
bool checkIdempotent(int mat[][N])
{   
    // Calculate multiplication of matrix
    // with itself and store it into res.
    int res[N][N];
    multiply(mat, res);
  
    for (int i = 0; i < N; i++)    
        for (int j = 0; j < N; j++)        
            if (mat[i][j] != res[i][j])
                return false;
    return true;
}
  
// Driver function.
int main()
{
    int mat[N][N] = {{2, -2, -4},
                    {-1, 3, 4},
                    {1, -2, -3}};
      
    // checkIdempotent function call.
    if (checkIdempotent(mat))
        cout << "Idempotent Matrix";
    else
        cout << "Not Idempotent Matrix.";
    return 0;
}


输出:

Idempotent Matrix

请参阅有关程序的完整文章以检查幂等矩阵以获取更多详细信息!