isargunnamed {gbutils} | R Documentation |
Is an element of a list named?
Description
Check if a component of a list is not named.
Usage
isargunnamed(x, k)
Arguments
x |
a list. |
k |
an integer, specifies a position in |
Details
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.
Value
TRUE or FALSE
Author(s)
Georgi N. Boshnakov
See Also
match.call
in base package
Examples
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")
[Package gbutils version 0.5 Index]