# The Rotated H-transform of a 3d Array by a Matrix

### Description

This function is an implementation of the *ρ*-operator found in
Currie et al 2006. It forms the basis of the GLAM arithmetic.

### Usage

1 | ```
RH(M, A)
``` |

### Arguments

`M` |
a |

`A` |
a 3d array of size |

### Details

For details see Currie et al 2006. Note that this particular implementation is not used in the optimization routines underlying the glamlasso procedure.

### Value

A 3d array of size *p_2 \times p_3 \times n*.

### Author(s)

Adam Lund

### References

Currie, I. D., M. Durban, and P. H. C. Eilers (2006). Generalized linear
array models with applications to multidimensional
smoothing. *Journal of the Royal Statistical Society. Series B*. 68, 259-280.