Dimensions of a pdMat Object
This method function returns the dimensions of the matrix represented
by object. 
## S3 method for class 'pdMat' Dim(object, ...)
object | 
 an object inheriting from class   | 
... | 
 some methods for this generic require additional arguments. None are used in this method.  | 
an integer vector with the number of rows and columns of the
matrix represented by object.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
Dim(pdSymm(diag(3)))
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