On Tue, 11 Jan 2011, Georg Otto wrote:
Dear R gurus,
first let me apologize for a question that might hve been answered
before. I was not able to find the solution yet. I want to concatenate
two lists of lists at their lowest level.
Suppose I have two lists of lists:
list.1 <- list("I"=list("A"=c("a", "b", "c"), "B"=c("d", "e", "f")),
"II"=list("A"=c("g", "h", "i"), "B"=c("j", "k", "l")))
list.2 <- list("I"=list("A"=c("A", "B", "C"), "B"=c("D", "E", "F")),
"II"=list("A"=c("G", "H", "I"), "B"=c("J", "K", "L")))
list.1
$I
$I$A
[1] "a" "b" "c"
$I$B
[1] "d" "e" "f"
$II
$II$A
[1] "g" "h" "i"
$II$B
[1] "j" "k" "l"
list.2
$I
$I$A
[1] "A" "B" "C"
$I$B
[1] "D" "E" "F"
$II
$II$A
[1] "G" "H" "I"
$II$B
[1] "J" "K" "L"
Now I want to concatenate list elements of the lowest levels, so the
result looks like this:
$I
$I$A
[1] "a" "b" "c" "A" "B" "C"
$I$B
[1] "d" "e" "f" "D" "E" "F"
$II
$II$A
[1] "g" "h" "i" "G" "H" "I"
$II$B
[1] "j" "k" "l" "J" "K" "L"
Has anybody a good solution for that?
mapply( function(x,y) mapply(c, x, y, SIMPLIFY=FALSE),
+ list.1, list.2, SIMPLIFY=FALSE )
$I
$I$A
[1] "a" "b" "c" "A" "B" "C"
$I$B
[1] "d" "e" "f" "D" "E" "F"
$II
$II$A
[1] "g" "h" "i" "G" "H" "I"
$II$B
[1] "j" "k" "l" "J" "K" "L"
HTH,
Chuck
Best,
Georg
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Charles C. Berry Dept of Family/Preventive Medicine
cbe...@tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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and provide commented, minimal, self-contained, reproducible code.
