isargunnamed | R Documentation |
Check if a component of a list is not named.
isargunnamed(x, k)
x |
a list. |
k |
an integer, specifies a position in |
isargunnamed(x,k)
returns TRUE if the k-th component of
x
is not named and FALSE otherwise.
Argument x
is typically a list of arguments used in a call
to a function, such as the one obtained by list(...)
in the
body of a function definition.
If k
is not positive, isargunnamed
returns FALSE.
TRUE or FALSE
Georgi N. Boshnakov
match.call
in base package
li1 <- list(a=1, 2, 3) isargunnamed(li1, 1) isargunnamed(li1, 2) ## wholly unnamed list li2 <- list(1, 2, 3) isargunnamed(li2, 1) isargunnamed(li2, 2) ## using in a function definition f1 <- function(...){ dots <- list(...) for(i in seq(along=dots)) cat(i, isargunnamed(dots, i), "\n") } f1(1) f1(a = 3, 4, c = 5) f1(x = "a", y = "b")
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