list2matrix.which {BAS} | R Documentation |

## Coerce a BAS list object into a matrix.

### Description

Models, coefficients, and standard errors in objects of class 'bas' are represented as a list of lists to reduce storage by omitting the zero entries. These functions coerce the list object to a matrix and fill in the zeros to facilitate other computations.

### Usage

```
list2matrix.which(x, which.models = NULL)
```

### Arguments

`x` |
a 'bas' object |

`which.models` |
a vector of indices use to extract a subset |

### Details

`list2matrix.bas(x, which)`

is equivalent to
`list2matrix.which(x)`

, however, the latter uses sapply rather than a
loop.
`list2matrix.which`

and `which.matrix`

both coerce
`x$which`

into a matrix.

### Value

a matrix representation of `x$what`

, with number of rows equal
to the length of which.models or total number of models and number of
columns `x$n.vars`

### Author(s)

Merlise Clyde clyde@duke.edu

### See Also

Other as.matrix methods:
`list2matrix.bas()`

,
`which.matrix()`

### Examples

```
data(Hald)
Hald.bic <- bas.lm(Y ~ ., data=Hald, prior="BIC", initprobs="eplogp")
coef <- list2matrix.bas(Hald.bic, "mle") # extract all ols coefficients
se <- list2matrix.bas(Hald.bic, "mle.se")
models <- list2matrix.which(Hald.bic) #matrix of model indicators
models <- which.matrix(Hald.bic$which, Hald.bic$n.vars) #matrix of model indicators
```

[Package

*BAS*version 1.7.1 Index]