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vector-construction
Create vectors
Description
The atomic vector constructors are equivalent to c() but:
-
They allow you to be more explicit about the output type. Implicit coercions (e.g. from integer to logical) follow the rules described in vector-coercion.
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They use dynamic dots.
Usage
lgl(...) int(...) dbl(...) cpl(...) chr(...) bytes(...)
Arguments
... |
Components of the new vector. Bare lists and explicitly spliced lists are spliced. |
Life cycle
-
All the abbreviated constructors such as
lgl()will probably be moved to the vctrs package at some point. This is why they are marked as questioning. -
Automatic splicing is soft-deprecated and will trigger a warning in a future version. Please splice explicitly with
!!!.
Examples
# These constructors are like a typed version of c(): c(TRUE, FALSE) lgl(TRUE, FALSE) # They follow a restricted set of coercion rules: int(TRUE, FALSE, 20) # Lists can be spliced: dbl(10, !!! list(1, 2L), TRUE) # They splice names a bit differently than c(). The latter # automatically composes inner and outer names: c(a = c(A = 10), b = c(B = 20, C = 30)) # On the other hand, rlang's ctors use the inner names and issue a # warning to inform the user that the outer names are ignored: dbl(a = c(A = 10), b = c(B = 20, C = 30)) dbl(a = c(1, 2)) # As an exception, it is allowed to provide an outer name when the # inner vector is an unnamed scalar atomic: dbl(a = 1) # Spliced lists behave the same way: dbl(!!! list(a = 1)) dbl(!!! list(a = c(A = 1))) # bytes() accepts integerish inputs bytes(1:10) bytes(0x01, 0xff, c(0x03, 0x05), list(10, 20, 30L))