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# Find the mean vector of a Matrix in C++

Suppose we have a matrix of order M x N, we have to find the mean vector of the given matrix. So if the matrix is like −

1 | 2 | 3 |

4 | 5 | 6 |

7 | 8 | 9 |

Then the mean vector is [4, 5, 6] As the mean of each column is (1 + 4 + 7)/3 = 4, (2 + 5 + 8)/3 = 5, and (3 + 6 + 9)/3 = 6

From the example, we can easily identify that if we calculate the mean of each column will be the mean vector.

## Example

#include<iostream> #define M 3 #define N 3 using namespace std; void calculateMeanVector(int mat[M][N]) { cout << "[ "; for (int i = 0; i < M; i++) { double average = 0.00; int sum = 0; for (int j = 0; j < N; j++) sum += mat[j][i]; average = sum / M; cout << average << " "; } cout << "]"; } int main() { int mat[M][N] = {{ 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } }; cout << "Mean vector is: "; calculateMeanVector(mat); }

## Output

Mean vector is: [ 4 5 6 ]

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