Bracket slice and assignment methods adapted for random vectors and arrays.
The assignment function impute<-
is compatible with both non-rv and
rv objects (rv, rvsummary, and rvfactor objects). To write universal code
that works both atomic and rv objects, use impute(x, ...) <- value
instead of x[...] <- value
.
NOTE. x
will NOT be automatically coerced into an rv object.
value
may be an rv object or a regular numeric object.
Extracting rv objects works the same way as extracting components of a numerical vector or array. The return value is always an object of class 'rv'. Type ?Extract for details.
Note: the index arguments (i
, j
, etc.) must be
constants, but this may change in the future.
%Note: the index arguments (i
, j
, etc.) may be %themselves
random variables, however they will be coerced %into integers, as one
would expect.
object from which to extract element(s) or in which to replace element(s).
indices specifying elements to extract or replace.
typically an array-like R object of a similar class as
x
.
For matrices and arrays. If TRUE
the result is coerced
to the lowest possible dimension (see the examples). This only works for
extracting elements, not for the replacement.
A random variable (an rv object).
Kerman, J. and Gelman, A. (2007). Manipulating and Summarizing Posterior Simulations Using Random Variable Objects. Statistics and Computing 17:3, 235-244.
See also vignette("rv")
.
x <- rvnorm(1)
y <- (1:5)
if (FALSE) {
y[2] <- x ## Will not work
}
impute(y, 2) <- x