PCA Centering

Centre a data matrix feature-wise: subtract each column's mean from that column.

Implement solve(X).

Returns. Return a float NumPy array of the same shape in which every column has mean $00$.

Examples

Example 1

Input:

solve([[1.0, 10.0], [3.0, 20.0], [5.0, 30.0]])

Output:

[[-2.0, -10.0], [0.0, 0.0], [2.0, 10.0]]

Example 2

Input:

solve([[4.0, 4.0]])

Output:

[[0.0, 0.0]]