pdClasses

0th

Percentile

Positive-Definite Matrix Classes

Standard classes of positive-definite matrices (pdMat) structures available in the nlme library.

Keywords
models
Value

  • Available standard classes:
  • pdSymmgeneral positive-definite matrix, with no additional structure
  • pdDiagdiagonal
  • pdIdentmultiple of an identity
  • pdCompSymmcompound symmetry structure (constant diagonal and constant off-diagonal elements)
  • pdBlockedblock-diagonal matrix, with diagonal blocks of any "atomic" pdMat class
  • pdNaturalgeneral positive-definite matrix in natural parametrization (i.e. parametrized in terms of standard deviations and correlations). The underlying coefficients are not unrestricted, so this class should NOT be used for optimization.

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.

See Also

pdCompSymm, pdDiag, pdIdent, pdNatural, pdSymm

Aliases
  • pdClasses
Documentation reproduced from package nlme, version 3.1-1, License: GPL version 2 or later

Community examples

Looks like there are no examples yet.