par2bsp {bspline} | R Documentation |

## Convert parameters to B-spline function

### Description

Convert parameters to B-spline function

### Usage

```
par2bsp(n, qw, xk, covqw = NULL, sdy = NULL, sdqw = NULL)
```

### Arguments

`n` |
Integer scalar, polynomial order of B-splines |

`qw` |
Numeric vector or matrix, coefficients of B-splines, one set per column in case of matrix |

`xk` |
Numeric vector, knots |

`covqw` |
Numeric Matrix, covariance matrix of qw (can be estimated in |

`sdy` |
Numeric vector, SD of each y column (can be estimated in |

`sdqw` |
Numeric Matrix, SD of qw thus having the same dimension
as qw (can be estimated in |

### Value

Function, calculating B-splines at arbitrary points and having
interface `f(x, select)`

where `x`

is a vector of abscissa points.
Parameter `select`

is passed to
`qw[, select, drop=FALSE]`

and can be missing. This function will return
a matrix of size `length(x) x ncol(qw)`

if `select`

is missing. Elsewhere,
a number of column will depend on `select`

parameter. Column names in
the result matrix will be inherited from `qw`

.

*bspline*version 2.2 Index]