Names.pdMat: Names of a pdMat Object
Description
This method function returns the fist element of the Dimnames
  attribute of object, which contains the column names of the
  matrix represented by object.Usage
## S3 method for class 'pdMat':
Names(object, \dots)
## S3 method for class 'pdMat':
Names(object, \dots) <- value
Value
if object has a Dimnames attribute then the first
  element of this attribute is returned; otherwise NULL.SIDE EFFECTS
On the left side of an assignment, sets the Dimnames attribute
  of object to list(value, value).Examples
Run this codepd1 <- pdSymm(~age, data = Orthodont)
Names(pd1)
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