solve.pdMat {nlme} | R Documentation |
The positive-definite matrix represented by a
is inverted and
assigned to a
.
solve(a, b, tol)
a |
an object inheriting from class pdMat , representing
a positive definite matrix. |
b |
this argument is only included for consistency with the generic function and is not used in this method function. |
tol |
an optional numeric value for the tolerance used in the
numerical algorithm. Defaults to 1e-7 . |
a pdMat
object similar to a
, but with coefficients
corresponding to the inverse of the positive-definite matrix
represented by a
.
Jose Pinheiro and Douglas Bates
library(nlme) pd1 <- pdCompSymm(3 * diag(3) + 1) solve(pd1)