as.matrix.corStruct {nlme}

Matrix of a corStruct Object

Description

This method function extracts the correlation matrix, or list of correlation matrices, associated with object.

Usage

## S3 method for class 'corStruct'
as.matrix(x, ...)

Arguments

x

an object inheriting from class "corStruct", representing a correlation structure.

...

further arguments passed from other methods.

Value

If the correlation structure includes a grouping factor, the returned value will be a list with components given by the correlation matrices for each group. Otherwise, the returned value will be a matrix representing the correlation structure associated with object.

Author(s)

José Pinheiro and Douglas Bates [e-mail]

References

Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York.

See Also

corClasses, corMatrix

Examples

cst1 <- corAR1(form = ~1|Subject)
cst1 <- Initialize(cst1, data = Orthodont)
as.matrix(cst1)