Check whether x and y are identical objects.
- x – Any R object.
- y – Any R object.
Example. Below we show that we can recreate two identical sets of pseudorandom numbers — exactly — by setting the seed. We verify that the two sets are identical using the identical function.
> set.seed(5) > x <- rnorm(3) > x  -0.8408555 1.3843593 -1.2554919 > set.seed(5) > y <- rnorm(3) > y  -0.8408555 1.3843593 -1.2554919 > identical(x, y)  TRUE > z <- c(-0.8408555, 1.3843593, -1.2554919) > identical(x, z)  FALSE
The objects x and y are not just really similar; they are identical. If we investigated z, we would find that x and z are different due to rounding errors.
Tip. The identical function may be applied to complex R objects, including lists and functions.