Description Usage Arguments Examples
Merges two lists. Every named element in the second argument is added recursively at the corresponding position in the first argument by name, over-writing existing values as necessary. Every un-named argument is added if there is no named argument to over-write.
1 2 |
x |
a list (coerced if not) |
y |
a list (coerced if not) |
... |
ignored |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | foo <- list(
a = list( # substituted by name
col = 'red', # substituted by name
lty = 'dashed', # substituted by name
alpha = 1, # preserved
8, # preserved, since element 4 in replacement matches by name
9 # substituted by position
),
letters[8:10], # preserved, siince elment 2 in replacement matches by name
b = 3
)
bar <- list(
letters[11:13], # ignored: position conflict with named element
b = 2, # substituted by name
a = list( # substituted by name
'blue', # ignored: position conflict with named element
col = 'green', # substituted by name
lty = 'solid', # substituted by name
lwd = 2, # added by name
3, # substituted by postion
4, # added by postion
hue = 5 # added by name
),
'baz' # added by postion
)
foo
bar
merge(foo,bar)
merge(list(1), list(2,foo = 3)) # 3 is assigned and named
merge(list(1), list(foo = 2,3)) # 3 is ignored since position 2 has been named by time of evaluation
merge(list(foo = 1), list(2,foo = 3)) # 2 ignored since pos. matches named argument; 3 overwrites
merge(list(foo = 1), list(2,3)) # 2 is ignored since position matches a named argument; 3 added
|
$a
$a$col
[1] "red"
$a$lty
[1] "dashed"
$a$alpha
[1] 1
$a[[4]]
[1] 8
$a[[5]]
[1] 9
[[2]]
[1] "h" "i" "j"
$b
[1] 3
[[1]]
[1] "k" "l" "m"
$b
[1] 2
$a
$a[[1]]
[1] "blue"
$a$col
[1] "green"
$a$lty
[1] "solid"
$a$lwd
[1] 2
$a[[5]]
[1] 3
$a[[6]]
[1] 4
$a$hue
[1] 5
[[4]]
[1] "baz"
$a
$a$col
[1] "green"
$a$lty
[1] "solid"
$a$alpha
[1] 1
$a[[4]]
[1] 8
$a[[5]]
[1] 3
$a$lwd
[1] 2
$a$hue
[1] 5
[[2]]
[1] "h" "i" "j"
$b
[1] 2
[[4]]
[1] "baz"
[[1]]
[1] 2
$foo
[1] 3
[[1]]
[1] 1
$foo
[1] 2
$foo
[1] 3
$foo
[1] 1
[[2]]
[1] 3
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