Function to compute an orthogonal projection matrix based on an arbitrary matrix.

1 | ```
B2P(x)
``` |

`x` |
A matrix with p rows and k columns. |

The orthogonal projection matrix *P* corresponding to matrix *x* is defined as *P=x (x^T x)^-1 x^T*.

The resulting orthogonal projection matrix.

Klaus Nordhausen

`O2P`

1 2 3 |

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