Extract.pdMat
Subscript a pdMat Object
Description
This method function extracts sub-matrices from the positive-definite matrix represented by x
.
Usage
## S3 method for class 'pdMat' x[i, j, drop = TRUE] ## S3 replacement method for class 'pdMat' x[i, j] <- value
Arguments
x | an object inheriting from class |
i, j | optional subscripts applying respectively to the rows and columns of the positive-definite matrix represented by |
drop | a logical value. If |
value | a vector, or matrix, with the replacement values for the relevant piece of the matrix represented by |
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.
Author(s)
José Pinheiro and Douglas Bates [email protected]
See Also
Examples
pd1 <- pdSymm(diag(3)) pd1[1, , drop = FALSE] pd1[1:2, 1:2] <- 3 * diag(2)
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Licensed under the GNU General Public License.