nlme (version 3.1-19)

[.pdMat: Subscript a pdMat Object

Description

This method function extracts sub-matrices from the positive-definite matrix represented by x.

Usage

x[i, j, drop]
x[i, j] <- value

Value

if i and j are identical, the returned value will be pdMat object with the same class as x. Otherwise, the returned value will be a matrix. In the case a single row (or column) is selected, the returned value may be converted to a vector, according to the rules above.

See Also

[, pdMat

Examples

pd1 <- pdSymm(diag(3))
pd1[1, , drop = FALSE]pd1[1:2, 1:2] <- 3 * diag(2)