model.matrix.gam | R Documentation |

Obtains the model matrix from a fitted `gam`

object.

```
## S3 method for class 'gam'
model.matrix(object, ...)
```

`object` |
fitted model object of class |

`...` |
other arguments, passed to |

Calls `predict.gam`

with no `newdata`

argument and
`type="lpmatrix"`

in order to obtain the model matrix of `object`

.

A model matrix.

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

Wood S.N. (2006b) Generalized Additive Models: An Introduction with R. Chapman and Hall/CRC Press.

`gam`

```
require(mgcv)
n <- 15
x <- runif(n)
y <- sin(x*2*pi) + rnorm(n)*.2
mod <- gam(y~s(x,bs="cc",k=6),knots=list(x=seq(0,1,length=6)))
model.matrix(mod)
```

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