pdgradient {lme4}R Documentation

Evaluated the pdmatrix gradient

Description

This function is generic. It returns the gradient of the positive definite matrix represented by x with respect to the parameters of x.

Usage

pdgradient(x)

Arguments

x An object of a suitable class, usually one of the classes that inherit from pdMat.

Value

A numeric array of dimension c(dim(x), length(coef(x))) that is the gradient of the pdmatrix represented by x with respect to the parameters of x.

Methods

x = pdIdent
gradient for the pdIdent class
x = pdLogChol
gradient for the pdLogChol class
x = pdMat
gradient for the pdMat class, implemented using pdgradNumeric

Author(s)

Douglas Bates bates@stat.wisc.edu and Saikat DebRoy saikat@stat.wisc.edu

See Also

pdgradNumeric

Examples






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