Hi List,
I'm trying to work out how to use which(), or another function, to find the
top-level index of a list item based on a condition. An example will clarify
my question.
a - list(c(1,2),c(3,4))
a
[[1]]
[1] 1 2
[[2]]
[1] 3 4
I want to find the top level index of c(1,2), which should return
Chris,
Well, the 'answer' could be:
which(sapply(a, function(x) all(x == c(1,2
But I wonder how these elements of 'a' in your
actual application are coming to be? If you're
constructing them, you can give the elements of
the list names, and then it doesn't matter what
numerical index they
Hi Chris,
Does this do what you're after? It just compares each element of a
(i.e., a[[1]] and a[[2]]) to c(1, 2) and determines if they are
identical or not.
which(sapply(a, identical, y = c(1, 2)))
There were too many 1s floating around for me to figure out if you
wanted to find elements of
On Nov 15, 2010, at 4:24 PM, Chris Carleton wrote:
Hi List,
I'm trying to work out how to use which(), or another function, to
find the
top-level index of a list item based on a condition. An example will
clarify
my question.
a - list(c(1,2),c(3,4))
a
[[1]]
[1] 1 2
[[2]]
[1] 3 4
I
Thanks for the suggestions. The issue for me is that the top level index is
also like a database key so it might be a bit annoying to coerce it to
char() so that I can reference it with a $ and then I would have to still be
able to find out what the name was automatically. I've got a function
On Nov 15, 2010, at 5:07 PM, Chris Carleton wrote:
Thanks for the suggestions. The issue for me is that the top level
index is
also like a database key so it might be a bit annoying to coerce it to
char() so that I can reference it with a $ and then I would have to
still be
able to find
Thanks for the suggestions, but 'cat' is not causing name space conflicts
for me and since I'm not packaging the code for anyone else to use, I'm less
than concerned about potential conflicts. I did type that too quickly, and I
have resolved my problem using a workaround that does not involve
On Nov 15, 2010, at 7:58 PM, Chris Carleton wrote:
Thanks for the suggestions, but 'cat' is not causing name space
conflicts for me
install.packages(
library(fortunes)
fortune(dog)
and since I'm not packaging the code for anyone else to use, I'm
less than concerned about potential
Dear R-Gurus,
I have ended up with a calculation problem where I need to use brobs.
I have to work my way through a vector with a for loop to act on each
element in a calculation (refering to the previous
value in the new vector of results -- so as far as I know I can't use
apply) -- this
.
Matt Redding
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Redding, Matthew
Sent: Wednesday, 28 May 2008 10:18 AM
To: r-help@r-project.org
Subject: [R] indexing lists, using brobdingnagian
Dear R-Gurus,
I have ended up with a calculation problem
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