mgcv (version 1.9-0)

model.matrix.gam: Extract model matrix from GAM fit

Description

Obtains the model matrix from a fitted gam object.

Usage

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

Value

A model matrix.

Arguments

object

fitted model object of class gam as produced by gam().

...

other arguments, passed to predict.gam.

Author

Simon N. Wood

Details

Calls predict.gam with no newdata argument and type="lpmatrix" in order to obtain the model matrix of object.

References

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

See Also

gam

Examples

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)