This function gives an alternative way of constructing an object inheriting from the
pdMat class named in
pdClass, or from
object inherits from
pdMat, and is mostly used internally in other functions. See the documentation on the principal constructor function, generally with the same name as the
pdMat class of object.
pdMat(value, form, nam, data, pdClass)
- an optional initialization value, which can be any of the following: a
pdMatobject, a positive-definite matrix, a one-sided linear formula (with variables separated by
+), a vector of character strings, or a numeric vector. Defaults to
numeric(0), corresponding to an uninitialized object.
- an optional one-sided linear formula specifying the row/column names for the matrix represented by
object. Because factors may be present in
form, the formula needs to be evaluated on a data.frame to resolve the names it defines. This argument is ignored when
valueis a one-sided formula. Defaults to
- an optional vector of character strings specifying the row/column names for the matrix represented by object. It must have length equal to the dimension of the underlying positive-definite matrix and unreplicated elements. This argument is ignored when
valueis a vector of character strings. Defaults to
- an optional data frame in which to evaluate the variables named in
form. It is used to obtain the levels for
factors, which affect the dimensions and the row/column names of the underlying matrix. If
NULL, no attempt is made to obtain information on
factorsappearing in the formulas. Defaults to the parent frame from which the function was called.
- an optional character string naming the
pdMatclass to be assigned to the returned object. This argument will only be used when
valueis not a
pdMatobject. Defaults to
Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer.
Documentation reproduced from package nlme, version 3.1-109. License: GPL (>= 2)