nlme (version 3.1-144)

formula.pdMat: Extract pdMat Formula

Description

This method function extracts the formula associated with a pdMat object, in which the column and row names are specified.

Usage

# S3 method for pdMat
formula(x, asList, …)

Arguments

x

an object inheriting from class "pdMat", representing a positive definite matrix.

asList

logical. Should the asList argument be applied to each of the components? Never used.

…

some methods for this generic require additional arguments. None are used in this method.

Value

if x has a formula attribute, its value is returned, else NULL is returned.

See Also

pdMat

Examples

# NOT RUN {
pd1 <- pdSymm(~Sex*age)
formula(pd1)
# }