.\" -*- nroff -*- generated from .Rd format
.BG
.FN pdClasses
.TL
Positive-Definite Matrix Classes
.DN
Standard classes of positive-definite matrices (`pdMat')
structures  available in the `lme' library.
.RT
Available standard classes:
.AG pdSymm
general positive-definite matrix, with no additional
structure
.AG pdDiag
diagonal
.AG pdIdent
multiple of an identity
.AG pdCompSymm
compound symmetry structure (constant diagonal and
constant off-diagonal elements)
.AG pdBlocked
block-diagonal matrix, with diagonal blocks of any
"atomic" `pdMat' class
.AG pdBand
banded positive-definite matrix

NOTE: Users may define their own `pdMat' classes by specifying a
`constructor' function and, at a minimum, methods for the
functions `pdConstruct', `pdMatrix' and `coef'. For
examples of these functions, see the methods for classes `pdSymm'
and `pdDiag'.
.SA
`pdCompSymm', `pdDiag',
`pdIdent', `pdSymm', `pdBand', `pdBlocked'
.KW models
.WR
