Hi,
If I have a vector:
junk - c(2,0,0,3,0)
and want to access, say, all the elements that are greater than zero. I just do:
junk[which(junk0)]
Now, If I have a list:
jlist - list(NULL,c(1,0),NULL,c(1,2,3), NULL)
and want to access all the elements that have length greater than zero, I
Hello,
Just try
jlist[ sapply(jlist,length) 0 ]
Hope this helps,
Rui Barradas
Em 08-11-2012 14:42, Gonçalo Ferraz escreveu:
Hi,
If I have a vector:
junk - c(2,0,0,3,0)
and want to access, say, all the elements that are greater than zero. I just do:
junk[which(junk0)]
Now, If I have
try this (use '[' for indexing)
jlist - list(NULL,c(1,0),NULL,c(1,2,3), NULL)
jlist
[[1]]
NULL
[[2]]
[1] 1 0
[[3]]
NULL
[[4]]
[1] 1 2 3
[[5]]
NULL
which(sapply(jlist, length) 0)
[1] 2 4
jlist[sapply(jlist, length) 0]
[[1]]
[1] 1 0
[[2]]
[1] 1 2 3
On Thu, Nov 8, 2012 at 9:42 AM,
: [R] Accessing selected elements of a list
Hi,
If I have a vector:
junk - c(2,0,0,3,0)
and want to access, say, all the elements that are greater than zero. I just do:
junk[which(junk0)]
Now, If I have a list:
jlist - list(NULL,c(1,0),NULL,c(1,2,3), NULL)
and want to access all
#[[5]]
#NULL
A.K.
- Original Message -
From: Gonçalo Ferraz gferra...@gmail.com
To: r-help@r-project.org
Cc:
Sent: Thursday, November 8, 2012 9:42 AM
Subject: [R] Accessing selected elements of a list
Hi,
If I have a vector:
junk - c(2,0,0,3,0)
and want to access, say, all
Hi there,
I cannot seem to figure out how to access the elements of a list if those
elements are a matrix.
For example I have a the following list
df.list - vector(list, 3)
and I have made each of the elements a matrix as follows
for(i in 1:3){
assign(paste(s,i, sep=),matrix(0, nrow = 20,
first of all take a look at the object you created:
df.list - vector(list, 3)
for(i in 1:3){
+ assign(paste(s,i, sep=),matrix(0, nrow = 20, ncol = 5, byrow
+ = FALSE, dimnames = NULL))
+ }
# and then insert them with a loop like this
# put matrices names in a vector
matrices-c(s1,s2,s3)
Hi R,
I wanted to know how do we access the elements of a list. In particular,
v=list(c(1,2,3,4,5),c(1,2,33,4,5),c(1,2,333,4,5),c(1,2,,4,5))
I want to access all the thirds items of the elements of the list. i.e.,
I want to access the elements, 3,33,333,. This can be done
can't use sapply
before we can really help you, though.
Bill Venables.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Shubha Vishwanath Karanth
Sent: Friday, 1 February 2008 7:05 PM
To: [EMAIL PROTECTED]
Subject: [R] Accessing the elements of a list
Hi
Shubha Vishwanath Karanth wrote:
Hi R,
I wanted to know how do we access the elements of a list. In particular,
v=list(c(1,2,3,4,5),c(1,2,33,4,5),c(1,2,333,4,5),c(1,2,,4,5))
I want to access all the thirds items of the elements of the list. i.e.,
I want to access the
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