pdgradNumeric {lme4} | R Documentation |
Evaluate the pdmatrix gradient via finite differences. This function
is used to validate the pdgradient
methods for pdMat
classes.
pdgradNumeric(x)
x |
A pdMat object |
A finite-difference approximation to the gradient of the
pdmatrix
represented by x
with respect to the parameters
of x
.
Douglas Bates bates@stat.wisc.edu and Saikat DebRoy saikat@stat.wisc.edu