Sl.inirep {mgcv} | R Documentation |

## Re-parametrizing model matrix X

### Description

INTERNAL routine to apply initial Sl re-parameterization to model matrix X,
or, if `inverse==TRUE`

, to apply inverse re-parametrization to parameter vector
or covariance matrix.

### Usage

```
Sl.inirep(Sl,X,l,r,nt=1)
Sl.initial.repara(Sl, X, inverse = FALSE, both.sides = TRUE, cov = TRUE,
nt = 1)
```

### Arguments

`Sl` |
the output of |

`X` |
the model matrix. |

`l` |
if non-zero apply transform (positive) or inverse transform from left. 1 or -1 of transform, 2 or -2 for transpose. |

`r` |
if non-zero apply transform (positive) or inverse transform from right. 1 or -1 of transform, 2 or -2 for transpose. |

`inverse` |
if |

`both.sides` |
if |

`cov` |
boolean indicating whether |

`nt` |
number of parallel threads to be used. |

### Value

A re-parametrized version of `X`

.

### Author(s)

Simon N. Wood <simon.wood@r-project.org>.

*mgcv*version 1.9-1 Index]