Class "Orthom": Orthogonal matrices

Given an angle *θ* whereby *θ \in [0, π/2)* the
function `Rd2`

returns a 2-dimensional rotation matrix of Euler angles.

1 | ```
Rd2(theta)
``` |

`theta` |
Numeric, angle in the interval |

`R` |
A 2-dimensional rotation matrix. |

Bernhard Pfaff

1 |

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