矩阵运算代码c++

以下是 C++ 中实现矩阵运算的基本代码：

#include <iostream>
#include <vector>

using namespace std;

// 定义矩阵数据类型
typedef vector<vector<double>> Matrix;

// 矩阵加法
Matrix matrixAddition(Matrix A, Matrix B) {
    int m = A.size(), n = A[0].size();
    Matrix C(m, vector<double>(n));
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
            C[i][j] = A[i][j] + B[i][j];
        }
    }
    return C;
}

// 矩阵乘法
Matrix matrixMultiplication(Matrix A, Matrix B) {
    int m = A.size(), n = A[0].size(), l = B[0].size();
    Matrix C(m, vector<double>(l));
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < l; j++) {
            for (int k = 0; k < n; k++) {
                C[i][j] += A[i][k] * B[k][j];
            }
        }
    }
    return C;
}

int main() {
    // 定义两个矩阵
    Matrix A = {{1, 2}, {3, 4}};
    Matrix B = {{5, 6}, {7, 8}};

    // 矩阵加法
    Matrix C = matrixAddition(A, B);
    cout << "Matrix addition result:" << endl;
    for (auto row : C) {
        for (auto elem : row) {
            cout << elem << " ";
        }
        cout << endl;
    }

    // 矩阵乘法
    Matrix D = matrixMultiplication(A, B);
    cout << "Matrix multiplication result:" << endl;
    for (auto row : D) {
        for (auto elem : row) {
            cout << elem << " ";
        }
        cout << endl;
    }

    return 0;
}

以上代码实现了矩阵加法和矩阵乘法操作，并在主函数中进行了示例操作。可以根据自己的需求进行修改和扩展。