object
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an object inheriting from class code{pdMat}, representing
a positive definite matrix.
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value
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an optional initialization value, which can be any of the
following: a code{pdMat} object, 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.
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form
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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 value is a one-sided
formula. Defaults to NULL .
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nam
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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
value is a vector of character strings. Defaults to
NULL .
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data
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an optional data frame in which to evaluate the variables
named in value and 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
factors appearing the random effects model. Defaults to parent
frame from which the function was called.
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